Aprobación

La adopción del Código Eléctrico Nacional ha sido aprobada por la Junta de Gobierno de la Autoridad de Energía Eléctrica de Puerto Rico, mediante su Resolución Núm. 2535 de 13 de diciembre de 1994. En San Juan, Puerto Rico, a 13 de diciembre de 1994. Ulorder Miguel A. Cordero Director Ejecutivo 7 de agosto de 1995 Fecha 10-05-94 pjrm JUNTA DE GOBIERNO AUTORIDAD DE ENERGIA ELECTRICA DE PUERTO RICO SAN JUAN, PUERTO RICO DEPNERGIA ELECTRICA DE OF COMMITORIDAD PUERTO OFFICIAL PO BOX 364267 DIRECCION CABLEGRAFICA SAN JUAN PR 00936-4267 PREPA DIRECCION TELEX AC 385714 CERTIFICACION 5293 Yo, Heydsha M. Eckert de Colón, Secretaria de la Junta de Gobierno de la Autoridad de Energía Eléctrica, por la presente CERTIFICO que la siguiente es una copia fiel y exacta de la Resolución número 2535, aprobada por la Junta de Gobierno de la Autoridad de Energía Eléctrica en su reunión regular del 13 de diciembre de 1994. En testimonio de lo cual, firmo la presente y hago estampar en ella el sello oficial de la Autoridad de Energía Eléctrica, hoy día 14 de diciembre de 1994. HEYDSHA M. ECKERT DE COLON, SECRETARIA JUNTA DE GOBIERNO CN 078-04479 ESTADO LIBRE ASOCIADO DE PUERTO RICO REV. 10/92 AUTORIDAD DE ENERGIA ELECTRICA DE PUERTO RICO SAN JUAN, PUERTO RICQ DEENERGIA ELECTRICA DE OF DIRECCION CABLEGRAFICA PUERTO PO BOX 364267 COMMATORICAD CORREO GENERAL PREPA DIRECCION TELEX AC OFICIALION SAN JUAN, PUERTO RICO 00936-4267 RESOLUCION 2535 5293 POR CUANTO: el Director Ejecutivo ha recomendado a la Junta de Gobierno que adopte el Código Eléctrico Nacional, versión 1993 (Véase Exhibit 1472), para cumplir con lo establecido en la Ley de Procedimiento Administrativo Uniforme para el Estado Libre Asociado de Puerto Rico, del 12 de agosto de 1988 ( Ley Núm. 170), según enmendada. POR CUANTO: este Código establece las normas y el proceso a seguir en las construcciones relacionadas con instalaciones eléctricas. POR CUANTO: el Director Ejecutivo ha solicitado a esta Junta de Gobierno la adopción de este Código para iniciar las gestiones de aviso al público y cumplir con los requisitos que establece la Ley Núm. 170, según enmendada, y radicar el mismo ante el Departamento de Estado. POR TANTO: la Junta de Gobierno de la Autoridad de Energía Eléctrica, RESUELVE QUE: 1. Se adopte el Código Propuesto. 2. El Director Ejecutivo queda autorizado a iniciar las gestiones para notificar al público, de acuerdo con las disposiciones de ley. 3. El Director Ejecutivo queda autorizado a radicar el Código Eléctrico Nacional, versión 1993, en el Departamento de Estado, de no sufrir enmiendas. APROBADA: 13 de diciembre de 1994 NATIONAL ELECTRICAL R CODE 1993 R L NFPA® Fire Protection Association rymarch Park, Quincy, MA. NOTICE All questions or other communications relating to this document should be sent only to NFPA Headquarters, addressed to the attention of the Committee responsible for the document. For information on the procedures for requesting Technical Committees to issue Formal Interpretations, proposing Tentative Interim Amendments, proposing amendments for Committee consideration, and appeals on matters relating to the content of the document, write to the Secretary, Standards Council, National Fire Protection Association, Batterymarch Park, Quincy, MA 02269. A statement, written or oral, that is not processed in accordance with Section 16 of the Regulations Governing Committee Projects shall not be considered the official position of NFPA or any of its Committees and shall not be considered to be, nor be relied upon as, a Formal Interpretation. Users of this document should consult applicable Federal, State and local laws and regulations. NFPA does not, by the publication of this document, intend to urge action which is not in compliance with applicable laws and this document may not be construed as doing SO. Policy Adopted by NFPA Board of Directors on December 3, 1982 The Board of Directors reaffirms that the National Fire Protection Association recognizes that the toxicity of the products of combustion is an important factor in the loss of life from fire. NFPA has dealt with that subject in its technical committee documents for many years. There is a concern that the growing use of synthetic materials may produce more or additional toxic products of combustion in a fire environment. The Board has, therefore, asked all NFPA technical committees to review the documents for which they are responsible to be sure that the documents respond to this current concern. To assist the committees in meeting this request, the Board has appointed an advisory committee to provide specific guidance to the technical committees on questions relating to assessing the hazards of the products of combustion. Licensing Provision - This document is copyrighted by the National Fire Protection Association (NFPA). 1. Adoption by Reference - Public authorities and others are urged to reference this document in laws, ordinances, regulations, administrative orders or similar instruments. Any deletions, additions and changes desired by the adopting authority must be noted separately. Those using this method are requested to notify the NFPA (Attention: Secretary, Standards Council) in writing of such use. The term "adoption by reference" means the citing of title and publishing information only. Continued on inside back cover Copyright © 1992 NATIONAL FIRE PROTECTION ASSOCIATION Batterymarch Park, Quincy, MA 02269 Núm: 2293 14 70-i de Fecha arto 041995 1:30p.us 1992 All reserved. Aprobado: NFPA, rights NormA E.Bargos Landlor NFPA 70 Secretario de Estado National Electrical Code® 1993 Editionataria Auxiliar de Estado This 1993 edition of the National Electrical Code (NFPA 70-1993) was adopted by the National Fire Protection Association, Inc. on May 21, at its 1992 Annual Meeting, in New Orleans, LA, and was released by the Standards Council on July 17, 1992. It was approved by the American National Standards Institute on August 14, 1992. This 1993 edition supersedes all other previous editions, supplements, and printings dated 1897, 1899, 1901, 1903, 1904, 1905, 1907, 1909, 1911, 1913, 1915, 1918, 1920, 1923, 1925, 1926, 1928, 1930, 1931, 1933, 1935, 1937, 1940, 1942, 1943, 1947, 1949, 1951, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1962, 1965, 1968, 1971, 1975, 1978, 1981, 1984, 1987, and 1990. Changes in this 1993 edition of the National Electrical Code (as compared with the 1990 edition) are indicated by vertical lines in the margin. The location (in the 1990 edition) of material not appearing in the 1993 edition, and not identified as a change by a vertical line, is identified by a bullet (·) in the margin. Changes in section and table numbers are not identified. Material identified by the superscript letter "x" includes text extracted from other NFPA documents as identified in Appendix A. This Code is purely advisory as far as the NFPA and ANSI are concerned, but is offered for use in law and for regulatory purposes in the interest of life and property protection. Anyone noticing any errors should notify the Secretary of the National Electrical Code Committee at the NFPA Executive Office. History and Development of the National Electrical Code The National Fire Protection Association has acted as sponsor of the National Electrical Code since 1911. The original Code document was developed in 1897 as a result of the united efforts of various insurance, electrical, architectural, and allied interests. In accordance with the provisions of the NFPA Regulations Governing Committee Projects, a National Electrical Code Technical Committee Report containing proposed amendments to the 1990 National Electrical Code was published by the NFPA in June 1991. This report recorded the actions of the various, Code- Making Panels and the Correlating Committee of the National Electrical Code Committee on each proposal that had been made to revise the 1990 Code. The report was circulated to all members of the National Electrical Code Committee, and was made available to other interested NFPA members and to the public for review and comment. Following the close of the public comment period, the Code-Making Panels met, acted on each comment, and reported their action to the Correlating Committee. The NFPA published the National Electrical Code Technical Committee Documentation in April 1992, which recorded the actions of the Code-Making Panels and the Correlating Committee on each public comment to the National Electrical Code Technical Committee Report. The NFPA 70-ii NATIONAL ELECTRICAL CODE also published the Advance Printing of the Proposed 1993 National Electrical Code in April 1992, to permit the study and evaluation by those interested, prior to formal action on the Committee Report by the 1992 NFPA Annual Meeting. The National Electrical Code Technical Committee Report and the National Electrical Code Technical Committee Documentation were presented to the 1992 NFPA Annual Meeting for adoption. The proceedings of that adoption are published in the September 1992 issue of the NFPA Journal. The NFPA has an Electrical Section that provides particular opportunity for NFPA members interested in electrical safety to become better informed and to contribute to the development of the National Electrical Code and other NFPA electrical standards. Each of the Code-Making Panels and the Chairman of the Correlating Committee reported their recommendations to meetings of the Electrical Section at the 1992 NFPA Annual Meeting. The Electrical Section thus had opportunity to discuss and review the report of the National Electrical Code Committee prior to the adoption of this edition of the Code by the Association. The time schedule for processing the 1996 edition of the National Electrical Code is as follows: 1996 NATIONAL ELECTRICAL CODE SCHEDULE (1995 ANNUAL MEETING) Date Event Nov. 5, 1993 (5:00 p.m. EST) Receipt of Proposals Jan. 10-22, 1994 Code-Making Panel Meetings May 9-13, 1994 Correlating Committee Meeting June 17, 1994 NEC-TCR to Mailing House Oct. 21, 1994 (5:00 p.m. EST) Closing Date for Comments Dec. 5-17, 1994 Code-Making Panel Meetings (TCD) March 6-10, 1995 Correlating Committee Meeting April 14, 1995 NEC-TCD to Mailing House May 22-25, 1995 NFPA Annual Meeting (Denver, CO) July 19-21, 1995 Standards Council Issuance Anyone may submit proposals to amend the 1993 Code. Sample forms for this purpose may be obtained from the Secretary of the Standards Council at NFPA Headquarters. The NFPA Electrical Code for One- and Two-Family Dwellings, NFPA 70A, 1993 edition, is an abridged version of the 1993 text, edited only as dictated to eliminate extraneous material not of concern to this type occupancy, and to place in the text only the more popular types of wiring methods, not to exclude any other type authorized by the complete Code. The National Electrical Code Handbook is published by the National Fire Protection Association. This text was prepared by the NFPA Chief Electrical Engineer and the NFPA Electrical Field Service Specialists. Method of Submitting a Proposal to Revise the National Electrical Code The following is based on the NFPA Regulations Governing Committee Projects, adopted by the Board of Directors on December 3, 1977 (last amended on June 16, 1992). A proposal to revise the 1993 edition of the National Electrical Code must be submitted so that the proposal is received at NFPA Headquarters by November HISTORY AND DEVELOPMENT 70-iii 5, 1993, as indicated in the time schedule for the 1996 National Electrical Code. A proposal received after this date will be returned to the submitter. The proposal is to be sent to the Secretary of the Standards Council at NFPA Headquarters, 1 Batterymarch Park, P.O. Box 9101, Quincy MA 02269-9101. Each proposal shall include: (a) identification of the submitter (the person's name) and his or her affiliation (i.e., committee, organization, company), where appropriate, and (b) an indication that the proposal is for revision of the 1993 National Electrical Code and identification of the specific section number, table number (or equivalent identification) of the section, etc., to be revised, and (c) a statement of the problem and substantiation for proposal, and (d) the proposed text of the proposal, including the wording to be added, revised (and how revised) or deleted. Proposals that do not include all of the above information may not be acted on by the National Electrical Code Committee. It is preferred that the forms available from NFPA for submittal of proposals be used. A separate proposal form should be used for revision of each section of the Code. An example of a properly submitted (although not necessarily technically correct or acceptable) proposal appears on the following page. NOTICE Following issuance of this edition of NFPA 70, The National Electrical Code, an appeal was filed with the NFPA Board of Directors. The appeal requests that Section 250-45 be revised to require redundant grounding of exposed noncurrent-carrying metal parts of cord- and plugconnected equipment likely to become energized. NFPA will announce the disposition of the appeal when it has been determined. Anyone wishing to receive automatically the disposition of the appeal should notify in writing the Secretary, Standards Council, NFPA Headquarters. 70-iv NATIONAL ELECTRICAL CODE FORM FOR PROPOSALS ON NFPA TECHNICAL COMMITTEE DOCUMENTS Mail to: Secretary, Standards Council National Fire Protection Association, 1 Batterymarch Park, Quincy, Massachusetts 02269-9101 Fax No.: 617-770-3500 Note: All proposals must be received by 5:00 p.m. E.S.T./E.D.S.T. on the published proposal closing date. Date Oct. 2, 1992 Name John Doe Tel. No. (617) 770-3000 Address 1234 Main St., Anyplace, MA 02269 Representing (Please indicate organization, company or self) ABC Manufacturing Co. 1. a) Document Title: National Elec. Code NFPA No. & Year 70-1993 b) Section/Paragraph: 663-23(a), Exception FOR OFFICE USE ONLY Log #: 2. Proposal recommends: (Check one) new text revised text Date Rec'd: deleted text. Proposal #: 3. Proposal (include proposed new or revised wording, or identification of wording to be deleted): Add a new exception as follows: \ Exception: In industrial occupancies where all of the following conditions are met: a. The equipment is listed; b. Conditions of maintenance and supervision assure that only qualified persons will service the equipment; C. The supply voltage does not exceed 600 volts, nominal. 4. Statement of Problem and Substantiation for Proposal: We have had over 20 years of experience using such equipment in 18 plants throughout the United Sates and Canada, and have found that it is often necessary to service the equipment while it is energized. Such servicing includes measurement of voltages and currents between various parts, and examination of the voltage and current waveforms. The use of interlocks on the equipment doors prevents such needed servicing. The equipment we use is listed by UL, FM, and CSA, and is not provided with interlocks because they were not judged necessary, and until the 1993 NEC, there was no Code rule requiring interlocks. The limitations in the proposed new exception should provide the necessary safeguards against electric shock without interlocks. 5. X This Proposal is original material. This Proposal is not original material; its source (if known) is as follows: (Note Original material " considered to be the submitter with idea based on or as a result of his own experience thought of researe and to the best of his knowledge is not copied from another writte I I hereby grant NFPA the non-exclusive, royalty-free rights, including non-exclusive, royalty-free rights in copyright, in this proposal and I understand that I acquire no rights in any publication of NFPA in which this proposal in this or another similar or analogous form is used. John Signature (Required) PLEASE USE SEPARATE FORM FOR EACH PROPOSAL CONTENTS 70-v CONTENTS ARTICLE PAGE ARTICLE PAGE 90 Introduction 1 Part E. Plug Fuses, Fuseholders, and Adapters 100 Chapter 1. General Part F. Cartridge Fuses and Fuseholders 101 100 Definitions 5 Part G. Circuit Breakers 101 Part A. General 5 Part H. Overcurrent Protection Part B. Over 600 Volts, Over 600 Volts, Nominal 103 Nominal 17 250 Grounding 103 110 Requirements for Electrical Part A. General 103 Installations 19 Part B. Circuit and System Part A. General 19 Grounding 105 Part B. Over 600 Volts, Part C. Location of System Nominal 25 Grounding Connections 108 Part D. Enclosure Grounding 114 Chapter 2. Wiring and Protection Part E. Equipment Grounding 115 Part F. Methods of Grounding 118 200 Use and Identification of Part G. Bonding 122 Grounded Conductors 31 Part H. Grounding Electrode 210 Branch Circuits 34 System 127 Part A. General Provisions 34 Part J. Grounding Conductors 129 Part B. Branch-Circuit Part K. Grounding Conductor Ratings 40 Connections 135 Part C. Required Outlets 44 Part L. Instrument Transform- 215 Feeders 48 ers, Relays, Etc. 136 220 Branch-Circuit, Feeder, and Part M. Grounding of Systems Service Calculations 50 and Circuits of 1 kV and Part A. General 50 Over (High Voltage) 137 Part B. Feeders 53 280 Surge Arresters 139 Part C. Optional Calculations Part A. General 139 for Computing Feeder Part B. Installation 139 and Service Loads 59 Part C. Connecting Surge Part D. Method for Computing Arresters 140 Farm Loads 63 225 Outside Branch Circuits and Chapter 3. Wiring Methods Feeders 64 and Materials 230 Services 70 Part A. General. 70 300 Wiring Methods 143 Part B. Overhead Service- Part A. General Requirements 143 Drop Conductors 73 Part B. Requirements for Over Part C. Underground Service- 600 Volts, Nominal 156 Lateral Conductors 75 305 Temporary Wiring 157 Part D. Service-Entrance 310 Conductors for General Conductors 76 Wiring 159 Part E. Service Equipment - 318 Cable Trays 198 General 80 320 Open Wiring on Insulators 207 Part F. Service Equipment - 321 Messenger Supported Wiring 209 Disconnecting Means 80 324 Concealed Knob-and-Tube Part G. Service Equipment - Wiring 211 Overcurrent Protection 84 325 Integrated Gas Spacer Cable Part H. Services Exceeding Type IGS 212 600 Volts, Nominal 86 Part A. General 212 240 Overcurrent Protection 90 Part B. Installation 213 Part A. General 90 Part C. Construction Part B. Location 95 Specifications 213 Part C. Enclosures 95 326 Medium Voltage Cable Part D. Disconnecting Type MV 215 and Guarding 99 70-vi NATIONAL ELECTRICAL CODE ARTICLE PAGE ARTICLE PAGE 328 Flat Conductor Cable 349 Flexible Metallic Tubing 253 Type FCC 216 Part A. General 253 Part A. General 216 Part B. Construction and Part B. Installation 217 Installation 253 Part C. Construction 218 350 Flexible Metal Conduit 254 330 Mineral-Insulated, Metal- 351 Liquidtight Flexible Metal Con- Sheathed Cable Type MI 220 duit and Liquidtight Flexible Part A. General 220 Nonmetallic Conduit 256 Part B. Installation 220 Part A. Liquidtight Flexible Part C. Construction Metal Conduit 256 Specifications 221 Part B. Liquidtight Flexible 331 Electrical Nonmetallic Tubing 221 Nonmetallic Conduit 258 Part A. General 221 352 Surface Metal Raceways and Part B. Installation 223 Surface Nonmetallic Part C. Construction Raceways 260 Specifications 224 Part A. Surface Metal 333 Armored Cable Type AC 224 Raceways 260 Part A. General 224 Part B. Surface Nonmetallic Part B. Installation 225 Raceways 261 Part C. Construction 353 Multioutlet Assembly 262 Specifications 226 354 Underfloor Raceways 263 334 Metal-Clad Cable Type MC 226 356 Cellular Metal Floor Raceways 265 Part A. General 226 Part A. Installation 265 Part B. Installation 227 Part B. Construction Part C. Construction Specifications 266 Specifications 228 358 Cellular Concrete Floor 336 Nonmetallic-Sheathed Cable Raceways 266 Types NM and NMC 229 362 Metal Wireways and Nonmetal- Part A. General 229 lic Wireways 268 Part B. Installation 230 Part A. Metal Wireways 268 Part C. Construction Part B. Nonmetallic Specifications 232 Wireways 270 337 Shielded Nonmetallic-Sheathed 363 Flat Cable Assemblies Type FC 271 Cable Type SNM 232 364 Busways 273 338 Service-Entrance Cable Types Part A. General SE and USE 233 Requirements 273 339 Underground Feeder and Part B. Requirements for Over Branch-Circuit Cable 600 Volts, Nominal 275 Type UF 235 365 Cablebus 277 340 Power and Control Tray Cable 370 Outlet, Device, Pull and Junc- Type TC 236 tion Boxes, Conduit Bodies 342 Nonmetallic Extensions 237 and Fittings 278 343 Preassembled Cable in Part A. Scope and General 278 Nometallic Conduit 239 Part B. Installation 279 Part A. General 239 Part C. Construction Part B. Installation 240 Specifications 287 Part C. Construction 241 Part D. Pull and Junction 345 Intermediate Metal Conduit 241 Boxes for Use on Systems Part A. General 241 Over 600 Volts, Nominal 288 Part B. Installation 242 373 Cabinets, Cutout Boxes, and Part C. Construction Meter Socket Enclosures 289 Specifications 244 Part A. Installation 289 346 Rigid Metal Conduit 244 Part B. Construction Part A. Installation 244 Specifications 292 Part B. Construction 374 Auxiliary Gutters 294 Specifications 247 380 Switches 296 347 Rigid Nonmetallic Conduit 248 Part A. Installation 296 Part A. Installation 249 Part B. Construction Part B. Construction Specifications 299 Specifications 250 384 Switchboards and Panelboards 300 348 Electrical Metallic Tubing 251 Part A. Switchboards 302 Part A. Installation 251 Part B. Panelboards 303 Part B. Construction Part C. Construction Specifications 252 Specifications 305 CONTENTS 70-vii ARTICLE PAGE ARTICLE PAGE Chapter 4. Equipment for Part F. Duct Heaters 368 General Use Part G. Resistance-type Boilers 369 400 Flexible Cords and Cables 307 Part H. Electrode-type Boilers 371 Part A. General 307 Part J. Electric Radiant Part B. Construction Heating Panels and Heating Specifications 321 Panel Sets 372 Part C. Portable Cables Over 426 Fixed Outdoor Electric Deicing 600 Volts, Nominal 322 and Snow-Melting 402 Fixture Wires 323 Equipment 376 410 Lighting Fixtures, Part A. General 376 Lampholders, Lamps, and Part B. Installation 377 Receptacles 331 Part C. Resistance Heating Part A. General 331 Elements 377 Part B. Fixture Locations 331 Part D. Impedance Heating 379 Part C. Provisions at Fixture Part E. Skin Effect Heating 380 Outlet Boxes, Canopies, and Part F. Control and Protection 380 Pans 334 427 Fixed Electric Heating Part D. Fixture Supports 335 Equipment for Pipelines and Part E. Grounding 336 Vessels 381 Part F. Wiring of Fixtures 337 Part A. General 381 Part G. Construction of Part B. Installation 382 Fixtures 340 Part C. Resistance Heating Part H. Installation of Elements 383 Lampholders 342 Part D. Impedance Heating 384 Part J. Construction of Part E. Induction Heating 384 Lampholders 342 Part F. Skin Effect Heating 385 Part K. Lamps and Auxiliary Part G. Control and Equipment 342 Protection 385 Part L. Receptacles, Cord 430 Motors, Motor Circuits, and Connectors, and Attachment Controllers 386 Plugs (Caps) 343 Part A. General 386 Part M. Special Provisions for Part B. Motor Circuit Flush and Recessed Fixtures 345 Conductors 396 Part N. Construction of Flush Part C. Motor and Branchand Recessed Fixtures 346 Circuit Overload Protection 399 Part P. Special Provisions for Part D. Motor Branch-Circuit Electric-Discharge Lighting Short-Circuit and Ground- Systems of 1000 Volts or Fault Protection 405 Less 347 Part E. Motor Feeder Short- Part Q. Special Provisions for Circuit and Ground-Fault Electric-Discharge Lighting Protection 409 Systems of More than 1000 Part F. Motor Control Circuits 410 Volts 349 Part G. Motor Controllers 413 Part R. Lighting Track 350 Part H. Motor Control 422 Appliances 351 Centers 415 Part A. General 351 Part I. Disconnecting Means 418 Part B. Branch-Circuit Part J. Over 600 Volts, Requirements 352 Nominal 421 Part C. Installation of Part K. Protection of Live Appliances 352 Parts - All Voltages 423 Part D. Control and Protection Part L. Grounding - All of Appliances 356 Voltages 424 Part E. Marking of Appliances 359 Part M. Tables 425 424 Fixed Electric Space Heating 440 Air-Conditioning and Refrigerat- Equipment 360 ing Equipment 431 Part A. General 360 Part A. General 431 Part B. Installation 361 Part B. Disconnecting Means 434 Part C. Control and Protection Part C. Branch-Circuit Shortof Fixed Electric Space Circuit and Ground-Fault Heating Equipment 362 Protection 436 Part D. Marking of Heating Part D. Branch-Circuit Equipment 365 Conductors 437 Part E. Electric Space Heating Part E. Controllers for Motor- Cables 365 Compressors 438 70-viii NATIONAL ELECTRICAL CODE ARTICLE PAGE ARTICLE PAGE Part F. Motor-Compressor and Part G. Isolated Power Branch-Circuit Overload Systems 561 Protection 438 518 Places of Assembly 562 Part G. Provisions for Room 520 Theaters, Audience Areas of Air Conditioners 441 Motion Picture and Televi- 445 Generators 442 sion Studios, and 450 Transformers and Transformer Similar Locations 564 Vaults 443 Part A. General 564 Part A. General Provisions 444 Part B. Fixed Stage Switch- Part B. Specific Provisions board 565 Applicable to Different Part C. Stage Equipment- Types of Transformers 451 Fixed 567 Part C. Transformer Vaults 454 Part D. Portable Switchboards 455 Phase Converters 456 on Stage 569 Part A. General 456 Part E. Stage Equipment - Part B. Specific Provisions Portable 574 Applicable to Different Part F. Dressing Rooms 576 Types of Phase Converters 458 Part G. Grounding 576 460 Capacitors 458 530 Motion Picture and Television Part A. 600 Volts, Nominal, Studios and Similar and Under 459 Locations 576 Part B. Over 600 Volts, Part A. General 576 Nominal 460 Part B. Stage or Set 577 470 Resistors and Reactors 462 Part C. Dressing Rooms 580 Part A. 600 Volts, Nominal, Part D. Viewing, Cutting, and and Under 462 Patching Tables 580 Part B. Over 600 Volts, Part E. Cellulose Nitrate Film Nominal 462 Storage Vaults 580 480 Storage Batteries 463 Part F. Substations 581 540 Motion Picture Projectors 581 Part A. General 581 Part B. Definitions 581 Chapter 5. Special Occupancies Part C. Equipment and Projectors of the Professional Type 582 500 Hazardous (Classified) Part D. Nonprofessional Pro- Locations 465 jectors 583 501 Class I Locations 472 Part E. Sound Recording and 502 Class II Locations 486 Reproduction 583 503 Class III Locations 495 545 Manufactured Building 583 504 Intrinsically Safe Systems 499 Part A. General 583 510 Hazardous (Classified) Loca- 547 Agricultural Buildings 585 tions - Specific 503 550 Mobile Homes and Mobile 511 Commercial Garages, Repair Home Parks 588 and Storage 503 Part A. General 588 513 Aircraft Hangars 506 Part B. Mobile Homes 590 514 Gasoline Dispensing and Part C. Services and Feeders 601 Service Stations 509 551 Recreational Vehicles and Rec- 515 Bulk Storage Plants 515 reational Vehicle Parks 604 516 Spray Application, Dipping, and Part A. General 604 Coating Processes 520 Part B. Low-Voltage 517 Health Care Facilities 530 Systems 606 Part A. General 530 Part C. Combination Electrical Part B. Wiring and Protection 534 Systems 609 Part C. Essential Electrical Part D. Other Power Sources 609 System 539 Part E. Nominal 120- or Part D. Inhalation Anesthetiz- 120/240-Volt Systems 611 ing Locations 554 Part F. Factory Tests 623 Part E. X-Ray Installations 558 Part G. Recreational Vehicle Part F. Communications, Sig- Parks 624 naling Systems, Data Sys- 553 Floating Buildings 627 tems, Fire Protective Part A. General 627 Signaling Systems, and Sys- Part B. Services and Feeders 628 tems Less than 120 Volts, Part C. Grounding 628 Nominal 560 555 Marinas and Boatyards 629 CONTENTS 70-ix ARTICLE PAGE ARTICLE PAGE Chapter 6. Special Equipment 668 Electrolytic Cells 683 669 Electroplating 688 600 Electric Signs and Outline 670 Lighting 633 Industrial Machinery 689 675 Part A. General 633 Electrically Driven or Controlled Irrigation Machines 690 Part B. 1000 Volts, Nominal, Part A. General 690 or Less 636 Part C. Over 1000 Volts, Part B. Center Pivot Irrigation Machines 694 Nominal 637 680 604 Manufactured Wiring Systems 641 Swimming Pools, Fountains, 605 and Similar Installations 694 Office Furnishings 642 Part A. General 610 694 Cranes and Hoists 644 Part A. General 644 Part B. Permanently Installed Pools 699 Part B. Wiring 644 Part C. Storable Pools Part C. Contact Conductors 706 648 Part D. Disconnecting Means 649 Part D. Spas and Hot Tubs 707 Part E. Fountains Part E. Overcurrent 709 Protection 650 Part F. Therapeutic Pools Part F. Control and Tubs in Health Care 651 Facilities 711 Part G. Grounding 652 620 Elevators, Dumbwaiters, Esca- Part G. Hydromassage Bathtubs 713 lators, Moving Walks, 685 Wheelchair Lifts, and Stair- Integrated Electrical Systems 713 Part A. General 713 way Chair Lifts 652 Part A. General 652 Part B. Orderly Shutdown 713 690 Part B. Conductors 653 Solar Photovoltaic Systems 714 Part A. General 714 Part C. Wiring 656 Part D. Installation of Part B. Circuit Requirements 716 Conductors Part C. Disconnecting Means 718 657 Part D. Wiring Methods 719 Part E. Traveling Cables 659 Part E. Grounding 720 Part F. Disconnecting Means and Control 660 Part F. Marking 720 Part G. Connection to Other Part G. Overcurrent Sources Protection 721 661 Part H. Machine Room 662 Part H. Storage Batteries 722 Part J. Grounding 663 Part K. Overspeed 663 Chapter 7. Special Conditions 630 Electric Welders 664 Part A. General 664 700 Emergency Systems 723 Part B. AC Transformer and Part A. General 72' DC Rectifier Arc Welders 664 Part B. Circuit Wiring 72 Part C. Motor-Generator Arc Part C. Sources of Power 72 Welders 665 Part D. Emergency System Part D. Resistance Welders 666 Circuits for Lighting and Part E. Welding Cable 668 Power 7 640 Sound-Recording and Similar Part E. Control - Emergency Equipment 668 Lighting Circuits 645 Electronic Computer/Data Part F. Overcurrent Processing Equipment 671 Protection 650 Pipe Organs 674 701 Legally Required Standby 660 X-Ray Equipment 675 Systems Part A. General 675 Part A. General Part B. Control 677 Part B. Circuit Wiring Part C. Transformers and Part C. Sources of Power Capacitors 678 Part D. Overcurrent Part D. Guarding and Protection Grounding 678 702 Optional Standby Systems 665 Induction and Dielectric Part A. General Heating Equipment 678 Part B. Circuit Wiring Part A. General 678 705 Interconnected Electric Powe Part B. Guarding, Grounding, Production Sources and Labeling 679 710 Over 600 Volts, Nominal Part C. Motor-Generator General Equipment 680 Part A. General Part D. Equipment Other than Part B. Equipment - Gene Motor-Generator 681 Provisions 70-x NATIONAL ELECTRICAL CODE ARTICLE PAGE ARTICLE PAGE Part C. Equipment - Specific Chapter 9 Tables and Examples Provisions 741 Part D. Installations Accessible Part A. Tables 819 to Qualified Persons Only 748 Table 1. Percent of Cross Sec- Part E. Mobile and Portable tion of Conduit and Tubing Equipment 748 for Conductors 819 Part F. Tunnel Installations 750 Table 2. Maximum Number of Part G. Electrode-type Boilers 751 Fixture Wires in Trade Sizes 720 Circuits and Equipment Operatof Conduit or Tubing 820 ing at Less than 50 Volts 752 Table 3A. Maximum Number 725 Class 1, Class 2, and Class 3 of Conductors in Trade Sizes Remote-Control, Signaling, and of Conduit or Tubing 821 Power-Limited Circuits 753 Table 3B. Maximum Number Part A. General 753 of Conductors in Trade Sizes Part B. Class 1 Circuits 754 of Conduit or Tubing 822 Part C. Class 2 and Class 3 Table 3C. Maximum Number Circuits 757 of Conductors in Trade Sizes 760 Fire Protective Signaling of Conduit or Tubing 823 Systems 767 Table 4. Dimensions and Per- Part A. General 767 cent Area of Conduit and of Part B. Nonpower-Limited Tubing 824 Fire Protective Signaling Table 5. Dimensions of Circuits 769 Rubber-Covered and Part C. Power-Limited Fire Pro- Thermoplastic-Covered tective Signaling Circuits 773 Conductors 825 770 Optical Fiber Cables and Table 5A. Compact Aluminum Raceways 782 Building Wire Nominal Part A. General 782 Dimensions and Areas 827 Part B. Protection 783 Table 5B. Maximum Number Part C. Cables Within of Compact Conductors in Buildings 783 Trade Sizes of Conduit or 780 Closed-Loop and Programmed Tubing 828 Power Distribution 788 Table 6. Dimensions of Lead- Covered Conductors 829 Chapter 8. Communications Table 8. Conductor Properties 830 Systems Table 9. AC Resistance and 800 Communications Circuits 791 Reactance for 600 V Cables, Part A. General 791 3-Phase 60, HZ, 75°C (167°F) Part B. Conductors Outside - Three Single Conductors in Conduit 831 and Entering Buildings 792 Part C. Protection 794 Table 10. Expansion Charac- Part D. Grounding Methods 796 teristics of PVC Rigid Nonmetallic Conduit 832 Part E. Conductors Within Buildings 798 Part B. Examples 833 10 Radio and Television Example No. 1(a). One-Family Equipment 805 Dwelling 833 Part A. General 805 Example No. 1(b). One-Family 834 Part B. Receiving Equipment Dwelling - Antenna Systems 805 Example No. 2(a). Optional Part C. Amateur Transmitting Calculation for One-Family and Receiving Stations - Dwelling, Heating Larger than Air Conditioning 834 Antenna Systems 808 Part D. Interior Installation - Example No. 2(b). Optional Transmitting Stations 810 Calculation for One-Family Community Antenna Television Dwelling, Air Conditioning and Radio Distribution Larger than Heating 835 810 Example No. 2(c). Optional Systems 810 Calculation for One-Family Part A. General Part B. Cables Outside and Dwelling with Heat Pump Entering Buildings 811 Single-Phase, 240/120-Volt 812 Service 836 Part C. Protection Part D. Grounding Methods 813 Example No. 3. Store Building 837 Part E. Cables Within Example No. 4(a). Multifamily Buildings 814 Dwelling 838 CONTENTS 70-xi ARTICLE PAGE ARTICLE PAGE Example No. 4(b). Optional Example No. 9. Feeder Size Calculation for Multifamily Determination for Generator Dwelling 840 Field Control 846 Example No. 5(a). Multifamily Example No. 10. Determining Dwelling Served at 208Y/120 Conductor Ampacity for a Volts, Three Phase 843 Group of Six Elevators on a Example No. 5(b). Optional Single Feeder Using Adjust- Calculation for Multifamily able Speed Drive 847 Dwelling Served at 208Y/120 Volts, Three Phase 844 Appendix A 849 Example No. 6. Maximum Demand for Range Loads 845 Appendix B 855 Example No. 8. Motors, Con- Index 873 ductors, Overload, and Short-Circuit and Ground- Fault Protection 845 First Printing, September 1992 Printed in U.S.A. - 70-xiii NATIONAL ELECTRICAL CODE COMMITTEE This list represents the membership at the time the Committee was balloted on the text of this edition. Since that time, changes in the membership may have occurred. Correlating Committee R. G. Biermann, Chairman Des Moines, IA Mark W. Earley, Secretary National Fire Protection Association (Nonvoting) Jean A. O'Connor, Recording Secretary National Fire Protection Association (Nonvoting) M.F. Borleis, Baltimore, MD Alternates Milton E. Cox, Northbrook, IL Melvin J. Anna, Morristown, NJ William R. Drake, Novato, CA Kenneth R. Edwards, Washington, DC (Alt. to L. H. Sessler) Edward L. Eldridge, Bridgewater, NJ Clyde H. Craig, Toledo, OH Joseph E. Pipkin, Washington, DC (Alt. to R. G. Biermann) Paul Duks, Northbrook, IL L. H. Sessler, Cary, NC J. Philip Simmons, Richardson, TX (Alt. to M. E. Cox) Robert Fagotti, Washington, DC Jay A. Stewart, Marquette, MI Wilford I. Summers, Colorado Springs, CO (Alt. to K. R. Edwards) Earl W. Roberts, Mystic, CT (Alt. to E. L. Eldridge) John W. Troglia, Milwaukee, WI (Alt. to M. F. Borleis) PANEL NO. 1-Articles 90, 100, 110 Frank K. Kitzantides, Chairman National Electrical Manufacturer's Association Randall A. Ambuehl, IBEW Local 291 J. Philip Simmons, International Association of Rep. International Brotherhood of Electrical Electrical Inspectors Workers Wilford I. Summers, Colorado Springs, CO Paul Duks, Underwriters Laboratories Inc. Jerald M. Gerber, Cleveland Electric Illuminating Alternates Co. M. F. Borleis, Baltimore Gas & Electric Rep. Electric Light Power Group/Edison Electric (Alt. to J. M. Gerber) Institute William F. Clark, City of Sacramento, CA Charles J. Hart, Bethesda, MD Rep. National Electrical Contractors Association (Alt. to J. P. Simmons) Philip H. Cox, National Electrical Manufacturers Vincent J. Hession, Bellcore Association Rep. Exchange Carriers Standards Association (Alt. to F. K. Kitzantides) E. Palko, Plant Engineering Magazine H. Landis Floyd, E. I. du Pont de Nemours & Co. Rep. Institute of Electrical & Electronics Engi- (Alt. to E. Palko) neers, Inc. Darwin E. McCurry, IBEW Local 12 Charles L. Roach, Tennessee Eastman Company (Alt. to R. A. Ambuehl) Rep. Chemical Manufacturers Association Charles H. Williams, National Electrical Contrac- Steven G. Roll, ETL Testing Laboratories tors Association (Alt. to C. J. Hart) PANEL NO. 2-Articles 210, 215, 220, Chapter 9, Examples 1 through 6 William I. Summers, Acting Chairman Colorado Springs, CO Raffic Ali, Underwriters Laboratories Inc. Bernard Mericle, IBEW James W. Carpenter, North Carolina Dept. of Rep. International Brotherhood of Electrical Insurance Workers Rep. International Association of Electrical Earl W. Roberts, REPTEC Inspectors Rep. National Electrical Manufacturers Robert J. Cunningham, Duquesne Light Co. Association Rep. Electric Light Power Group/Edison Electric Thomas E. Sparling, Tom Sparling Associates Institute Rep. Institute of Electrical & Electronics Engi- Winfield E. Haggard, Win-Electric, Inc. neers, Inc. Rep. IEC H. Brooke Stauffer, SMART HOUSE Limited Thomas L. Harman, University of Houston Clear Partnership Lake Rep. National Association of Home Builders Billy H. McClendon, PPG Industries, Inc. Stephen J. Thorwegen, Fisk Electric Company Rep. Chemical Manufacturers Association Rep. National Electrical Contractors Association 70-xiv NATIONAL ELECTRICAL CODE Alternates George F. Hawkes, Crouse-Hinds Co. J. F. Abegglen, San Diego Gas & Electric (Alt. to E. W. Roberts) (Alt. to R. J. Cunningham) J. Morris Trimmer, University of Florida Richard W. Becker, Engineered Electrical Sys- (Alt. to T. L. Harman) tems, Inc. Michael P. Wissman, Henderson Electric Co. of (Alt., to T. E. Sparling) Ohio, Inc. Ernest S. Broome, City of Knoxville, TN (Alt. to W. E. Haggard) (Alt. to J. W. Carpenter) William Wusinich, IBEW Local 98 (Alt. to IBEW Rep.) Panel No. 3-Articles 300, 305, 690 E. C. Lawry, Chairman WI Dept. Industrial Labor & Human Relations Rep. International Association of Electrical Inspectors Michael F. Auth, Auth Electric Thomas H. Wood, Cecil B. Wood Inc. Rep. Associated Builders and Contractors, Inc. Rep. National Electrical Contractors Association C. John Beck, Pacific Gas and Electric Co. Rep. Electric Light Power Group/Edison Electric Alternates Institute Charles W. Beile, Allied Tube & Conduit Ward I. Bower, Sandia National Rep. National Electrical Manufacturers Association (Alt. to R. D. Nicholson) Ronald R. Bishop, Carlon Edward A. Hamilton, Niagara Mohawk Power Rep. SPI/VI Corp. Richard G. Gewain, Hughes Associates Inc. (Alt. to C. J. Beck) Charles E. Jackson, Celanese Chemical Co. Inc. Daleep C. Mohla, Union Carbide Corporation Rep. Chemical Manufacturers Association (Alt. to B. W. Whittington) Donald A. Mader, Underwriters Laboratories Inc. George A. Straniero, Triangle PWC Inc. Robert D. Nicholson, Solar Cells Inc. (Alt. to C. W. Beile) Rep. Solar Energy Industries Association Raymond W. Weber, City of Wisconsin Rapids (Vote Limited to Article 690) (Alt. to E. C. Lawry) Michael Palivoda, LTV Steel Tubular Co. Craig M. Wellman, E.I. du Pont de Nemours & Co. Rep. American Iron and Steel Institute (Alt. to C. E. Jackson) B W. Whittington, Whittington Engineering Inc. Rep. Institute of Electrical & Electronics Engineers, Inc. PANEL NO. 4-Articles 225, 230 Glen W. Cock, Chairman Tampa Electric Co. Rep. Electric Light Power Group/Edison Electric Institute K. W. Carrick, B. P. Oil Company Alternates Rep. Institute of Electrical & Electronics Engineers, Inc. Hugh D. Butler, Southwire Robert T. Davis, Knoxville Utilities Board (Alt. to J. L. Hunter) Rep. American Public Power Association Dennis Darling, Molan Engineering Howard D. Hughes, Hughes Electric Co. Inc. (Alt. to K. W. Carrick) Rep. National Electrical Contractors Association Junior L. Owings, State of Oregon James Lee Hunter, Southwire Co. (Alt. to D. R. Strassburg) Rep. The Aluminum Association Philip M. Piqueira, General Electric Company John H. Kassebaum, Eli Lilly & Co. (Alt. to J. W. Young) Rep. Chemical Manufacturers Association Vincent J. Saporita, Bussmann, Cooper Insustries Ray C. Mullin, Bussmann, Cooper Industries (Alt. to R. C. Mullin) Robert J. Pollock, Underwriters Laboratories Inc. Robert Skinner, Northeast Utilities Service Albert J. Reed, New York Board of Fire Under- (Alt. to G. W. Cock) writers Jack K. Veazey, IBEW - Local 850 Donald R. Strassburg, State of Washington (Alt. to IBEW Rep.) Rep. International Association of Electrical Inspectors Nonvoting Jack K. Veazey, IBEW, Local 850 John W. Young, Siemens Energy & Automation, M. R. Holman, Square D. Canada Inc. Rep. National Electrical Manufacturers Association PANEL NO. 5-Articles 200, 250, 280 L. H. Sessler, Chairman Cary, NC Rep. Exchange Carriers Standards Association Robert E. Bernd, Underwriters Laboratories Inc. Richard A. Haman, ND State Electrical Board James E. Bessine, IBEW Local 13 Rep. International Association of Electrical Rep. International Brotherhood of Electrical Inspectors Workers Richard Lloyd, Alflex Corp. Rep. The Aluminum Edward L. Eldridge, Thomas & Betts Co. Association Rep. National Electrical Manufacturers D. H. Mcintosh, Newark, DE Association Rep. Chemical Manufacturers Association NATIONAL ELECTRICAL CODE COMMITTEE 70-xv William J. Neiswender, Orlando, FL Donald J. Frost, IBEW Local 288 Rep. Institute of Electrical & Electronics Engi- (Alt. to J. Bessine) neers, Inc. Abjul Q. Haideri, EI. du Pont de Nemours & Co. William F. Saffell, Black & Decker (US) Inc. (Alt. to D. H. McIntosh) Rep. Power Tool Institute, Inc. Robert C. Oldham, Reynolds Metals Co. Ronald J. Toomer, Toomer Electrical Co. Inc. (Alt. to R. Lloyd) Rep. National Electrical Contractors Association David Peot, The Singer Co. (Alt. to W. F. Saffell) Alternates Elliot Rappaport, Electro Technology Consultants Inc. (Alt. to W. J. Neiswender) Melvin J. Anna, Bell Communications Research Jerome W. Seigel, General Electric Co. (Alt. to L. H. Sessler) (Alt. to E. L. Eldridge) Paul M. Bowers, City of Iowa City, IA Douglas White, Houston Lighting & Power Co. (Alt. to R. A. Haman) Norman H. Davis, Underwriters Laboratories Inc. (Alt. to EEI Rep.) (Alt. to R. E. Bernd) PANEL NO. 6-Articles 310, 400, 402, Chapter 9, Tables 5 through 9 Clyde H. Craig, Chairman Craig Electric Co. Rep. National Electrical Contractors Association Harold Baggett, IBEW, Local 1701 Alternates Rep. International Brotherhood of Electrical Workers Joseph W. Aitken, Hercules Inc. David P. Brown, Baltimore Gas & Electric Co. (Alt. to D. A. Voltz) Rep. Electric Light Power Group/Edison Electric William C. Ferrell, IBEW Institute (Alt. to H. Baggett) Dwight Durham, Southwire Co. Barry N. Hornberger, Philadelphia Electric Co. Rep. The Aluminum Association (Alt. to D. P. Brown) L. Bruce McClung, Union Carbide Corp. W Terry Lindsay, Duncan Electric Company Inc. Rep. Institute of Electrical & Electronics Engi- (Alt. to C. H. Craig) neers, Inc. Patricia McCune, Alcan Cable Robert R. Sallaz, City of Akron, OH (Alt. to D. Durham) Rep. International Association of Electrical Dann N. Strube, Dept. of Housing, Building & Inspectors Construction George A. Straniero, Triangle PWC Inc. (Alt. to R. R. Sallaz) Rep. National Electrical Manufacturers Association Donald A. Voltz, Dow Chemical USA Nonvoting Rep. Chemical Manufacturers Association Austin C. Tingley, Canada Wire & Cable Co. Ltd. Leonard B. Zafonte, Underwriters Laboratories Inc. PANEL NO. 7-Articles 320, 321, 324, 325, 326, 328, 330, 333, 334, 336, 337, 338, 339, 340, 342, 363 Constantine S. Golovko, Chairman Building & Safety Division Rep. International Association of Electrical Inspectors Bobby C. Gentry, Southwire Co. David E. Schumacher, Schumacher Electric Rep. The Aluminum Association Company Inc. Thomas J. Guida, Underwriters Laboratories Inc. Rep. Associated Builders and Contractors, Inc. A P. Haggerty, Scott Paper Co. Rep. Institute of Electrical & Electronics Engi- Alternates neers, Inc. Charles J. Hart, Bethesda, MD J. Randy Bottomiee, B'ham Electrical JATC Rep. National Electrical Contractors Association (Alt. to D. E. Morgan) Russell W. Higginbottom, Triangle Conduit & James M. Daly, Cablec Corporation Cable Co. (Alt. to R. W. Higginbottom) Rep. National Electrical Manufacturers Association Patricia McCune, Alcan Cable John A. Kroiss, Shell Oil Co. (Alt. to B. C. Gentry) Rep. Chemical Manufacturers Association Eugene M. Rubin, City of Los Angeles, CA Robert J. Eugene, City of Spokane, WA (Alt. to C.S. Golovko) Peter F. V. Lloyd, B. F. Goodrich Co. Lynn F. Saunders, General Motors Corp. Don E. Morgan, IBEW - Local 756 (Alt. to A. P. Haggerty) Rep. International Brotherhood of Electrical Ronald L. Spees, Consumers Power Co. Workers (Alt. to D. C. Roberts) D. C. Roberts, American Electric Power Service D F. Tulloh, Union Carbide Corp. Corp. (Alt. to J. A. Kroiss) Rep. Electric Light Power Group/Edison Electric Charles H. Williams, National Electrical Contrac- Institute tors Association (Alt. to C. J. Hart) 70-xvi NATIONAL ELECTRICAL CODE PANEL NO. 8-Articles 318, 331, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 356, 358, 362, 364, 365, 374, Chapter 9, Tables 1 through 4 Armond C. Webb, Chairman Pacific Gas & Electric Co. Rep. Electric Light Power Group/Edison Electric Institute John E. Bond, IBEW Local 948 Alternates Rep. International Brotherhood of Electrical Workers Richard J. Baltes, Baltes Electric Corporation Wayne Brinkmeyer, Biddle Electric Corp. (Alt. to J. S. Corry) Rep. National Electrical Contractors Association Khimchand H. Chudasama, US Department of John S. Corry, Corry Electric Inc. Veterans Affairs Rep. Associated Builders and Contractors, Inc. (Alt. to J. E. Tyson) Dwight Durham, Southwire Co. Robert W. Cox, ICI Americas, Inc. Rep. The Aluminum Association (Alt. to R. B. Phillips) Charles W. Forsberg, Carlon Wyman H. Hawley, Athens-Clarke County Rep. SPI/VI (Alt. to W. A. Lilly) James L Griffin, Wheatland Tube Co. Richard Lloyd, Alflex Corp. Rep. American Iron and Steel Institute (Alt. to D. Durham) Kenneth E. Haas, Underwriters Laboratories Inc. Gary J. O'Neil, Southern California Edison Co. J. Earl Kreuzer, American Electric Co. (Alt. to A. C. Webb) Rep. National Electrical Manufacturers Association James E. Robertson, Dow Chemical Co. Wayne A. Lilly, City of Harrisburg (Alt. to IEEE Rep.) Robert B. Phillips, Monsanto Co. D. Ray Rink, IBEW Local 153 Rep. Chemical Manufacturers Association (Alt. to J. E. Bond) Dennis L. Rowe, NY Board of Fire Underwriters Ronald J. Toomer, Toomer Electrical Co. Inc. James E. Tyson, US Department of Veterans (Alt. to W. Brinkmeyer) Affairs L. Vincent Siemens, Energy & Automation Inc. (Alt. to J. E. Kreuzer) PANEL NO. 9-Articles 370, 373, 380, 384 Dale R. Deming, Chairman American Electric Co. Artie O. Barker, Boise, ID William R. Stalker, Commonwealth Edison Co. Joseph A. Cannatelli, Arco Chemical Co. Rep. Electric Light Power Group/Edison Electric Rep. Chemical Manufacturers Association Institute Frederic P. Hartwell, Electrical Construction & Maintenance Magazine Alternates Orlen G. Holien, City Electric Rep. Associated Builders and Contractors, Inc. Michael A. Chetney, Milwaukee Area Electrical Philip Lyle Johnson, Siemens Energy & Automa- JATC tion Inc. (Alt. to F. J. Smith) Rep. National Electrical Manufacturers Association Kermit B. Duncan, Pacific Power & Light Co. Robert Kaemmerlen, Kaemmerlen Electric Co. (Alt. to W. R. Stalker) Rep. National Electrical Contractors Association Anthony Montuori, New York Board of Fire Wayne Menuz, Underwriters Laboratories Inc. Underwriters Anthony J. Mussi, NY Board of Fire Underwriters (Alt. to A. J. Mussi) Rep. International Association of Electrical Inspectors Wallace Salshutz, Pfizer Inc. David K. Norton, US Department of Veterans (Alt. to J. A. Cannatelli) Affairs William E. Slater, RACO Inc. Sukanta Sengupta, Rhone-Poulenc Inc. (Alt. to P. L. Johnson) Rep. Institute of Electrical & Electronics Engi- Constantinos V. Vasiliades, US Department of neers, Inc. Veterans Affairs Fred J. Smith, IBEW Local 117 (Alt. to D. K. Norton) Rep. International Brotherhood of Electrical Workers PANEL NO. 10-Articles 240, 780 Stanley D. Kahn, Chairman Forest Electric Corporation Rep. National Electrical Contractors Association Robert J. Deaton, Union Carbide Corp. Arden L. Munson, Hussmann Corp. Richard L. Doughty, EI. de Pont de Nemours & Co. Rep. Air Conditioning and Refrigeration Institute Rep. Chemical Manufacturers Association George J. Ockuly, Bussmann, Cooper Industries Donald G. Fischer, Square D. Co. Clarence Whelan, IBEW Local 242 Rep. National Electrical Manufacturers Association Rep. International Brotherhood of Electrical Donald E. Fritz, Pennsylvania Power & Light Workers Rep. Electric Light Power Group/Edison Electric Alternates Institute Patrick R. Herbert, High Voltage Maintenance Joseph J. Andrews, Westinghouse Savannah Corp. River Co. Rep. International Electrical Testing Association Inc. (Alt. to R. J. Deaton) John J. Mahal, Underwriters Laboratories Inc. Douglas A. Fisher, IBEW Local 474 Leo F. Martin, City of Boston, MA (Alt. to C. Whelan) Rep. International Association of Electrical Carl J. Fredericks, Dow Chemical USA Inspectors (Alt. to R. L. Doughty) NATIONAL ELECTRICAL CODE COMMITTEE 70-xvii Paul P. Gubany, Bussmann, Cooper Industries R. O. D. Whitt, Westinghouse Electric Corp. (Alt. to G. J. Ockuly) (Alt. to D. G. Fischer) A. F. KnicKrehm, The KnicKrehm Co. Kevin L Young, White-Rodgers (Alt. to S. D. Kahn) (Alt. to A. Munson) James D. Mars, TU Electric - TP&L Division (Alt. to D. E. Fritz) Nonvoting William F. Nagle, Town of Danvers, MA Rick C. Gilmour, Canadian Standards Association (Alt. to L. F. Martin) PANEL NO. 11-Articles 430, 440, 670, Chapter 9, Example No. 8 Richard W. Osborn, Chairman Rep. National Electrical. Contractors Association David S. Baker, Brown & Root USA Inc. Alternates Rep. Institute of Electrical & Electronics Engi- Joe David Cox, Tennessee Eastman Co. neers, Inc. Milton E. Cox, Underwriters Laboratories Inc. (Alt. to T. Dye) Michael D. Landolfi, Landolfi Electric Co. Inc. Thomas E. Dye, Olin Corp. Rep. Chemical Manufacturers Association (Alt. to R. Schultz) Francis Finnegan, Texas Instruments Inc. Joseph E. Martin, Emerson Electric Co. William T. Fiske, ETL Testing Laboratories Inc. (Alt. to D. P. Ruedi) Paul P. Gubany, Bussmann, Cooper Industries Philip W. Mason, JATC of Greater Boston T. A. Jacoby, Tecumseh Products Co. (Alt. to R. F. Sheehan) Rep. Air Conditioning and Refrigeration Institute George J. Ockuly, Bussmann, Cooper Industries Miguel G. Lopez, US Department of Veterans (Alt. to P. P Gubany) Tim Pinnick, City of Lawrence, KS Affairs (Alt. to M. N. Shapiro) Don P. Ruedi, Square D. Co. Richard A. Rasmussen, Underwriters Laborato- Rep. National Electrical Manufacturers Association Charles B. Schram, Wilmette, IL ries, Inc. Robert Schultz, A. D. S. Electric Company Inc. (Alt. to M. Cox) Rep. Associated Builders and Contractors, Inc. Lynn F. Saunders, General Motors Corp. Mark N. Shapiro, City of Madison Heights, MI (Alt. to D. S. Baker) Jeffrey L. Steplowski, Department of Veterans Rep. International Association of Electrical Inspectors Affairs Russell F. Sheehan, IBEW Local 103 Rep. International Brotherhood of Electrical (Alt. to M. Lopez) M. Edward Thomas, Alabama Power Company Workers David W. Trudeau, Factory Mutual Research (Alt. to ELPG/EEI Rep.) Leonard K. VanTassel, Carrier Air Conditioning James A. Wilson, Black & Veatch (Alt. to T. A. Jacoby) Thomas H. Wood, Cecil B. Wood Inc. (Alt. to R. W. Osborn) NONVOTING Robert Colvin, Allen-Bradley Canada Ltd. PANEL NO. 12-Articles 427, 610, 620, 630, 645, 660, 665, 668, 669, 685 B. W. Whittington, Chairman Whittington Engineering Inc. A. R. Cartal, Middle Dept. Inspection Agency, Inc. Ronald L. Purvis, Georgia Power Company Rep. International Association of Electrical Rep. Electric Light Power Group/Edison Electric Inspectors Institute James F. Cook, Eagle Electric Manufacturing Robert H. Reuss, Harnischfeger Corp. Rep. National Electrical Manufacturers Association Rep. Crane Manufacturers Association of Amer- Michael J. DeMartini, Underwriters Laboratories Inc. ica Inc. Ralph E. Droste, United Technologies/Otis Eleva- (Vote Limited to Article 610) tor Co. T. Neil Thoria, Inland Steel Co. Rep. National Elevator Industry Inc. Rep. Association of Iron & Steel Engineers (Vote Limited to Articles 610, 620, 630) (Vote Limited to Articles 610, 620, 630) C. James Erickson, Newark, DE Charles M. Trout, Main Electric Company Inc. Rep. Chemical Manufacturer's Association Rep. National Electrical Contractors Association (Vote Limited to Articles 427, 610, 645, 660, 665, Alternates 668, 669, 685) Arthur Fine, AT&T Bell Laboratories Thomas C. Feindel, Digital Equipment Corporation Rep. Insulated Cable Engineers Association Inc. (Alt. to D. G. Nutt) William J. Kelly, Eastman Kodak Co. Rep. Institute of Electrical & Electronics Engi- (Vote Limited to Article 645) Wayne Hoffman, ESAB Welding Products, Inc. neers, Inc. (Alt. to J. F. Cook) B. J. Lowery, IBEW Local 175 R H. Keis, First State Inspection Agency, Inc. Rep. International Brotherhood of Electrical (Alt. to A. R. Cartal) Workers Richard H. Laney, Siecor Corporation David G. Nutt, International Business Machines Rep. Computer & Business Equipment Manufac- (Alt. to A. Fine) Nick Marchitto, Otis Elevator Co. turers Association (Vote Limited to Article 645) (Alt. to R. E. Droste) C. L. Pittman, Maryville, TN (Vote Limited to Articles 610, 620, 630) Rep. The Aluminum Association (Vote Limited to Articles 645, 660, 665, 668, 669, 685) 70-xviii NATIONAL ELECTRICAL CODE S L. Ralston, PPG Industries Inc. John N. Wright, IBEW Local 270 (Alt. to C. J. Erickson) (Alt. to B. J. Lowery) (Vote Limited to Articles 427, 610, 645, 660, 665, 668, 669, 685) Nonvoting Merritt D. Redick, BHP-UTAH Int'l Inc. (Alt. to W. J. Kelly) K. McCullough, National Elevator & Escalator Leo R. Wasilewski, Reynolds Metals Co Association (Alt. to C. L. Pittman) (Vote Limited to Articles 645, 660, 665, 668, 669, 685) PANEL NO. 13-Articles 450, 460, 470, 710 Kernan R. Dennis, Chairman Northwest Electric Co. Rep. National Electrical Contractors Association William A. Brunner, IBEW Alternates Hugh D. Butler, Southwire Carrollton, GA Rep. The Aluminum Association David A. Barnard, ACME Electrical Corp. E E. Carlton, Menlo Park, CA (Alt. to W. E. Thomas) Walter Kroboth, Exxon Chemical Co. J. Alan Barringer, North Carolina Department of Rep. Chemical Manufacturers Association Insurance Hiram J. Lamb, City of Charlottesville, VA (Alt. to H. J. Lamb) Rep. International Association of Electrical O. L. Davis, Manzano Western, Inc. Inspectors (Alt. to K. R. Dennis) William T. O'Grady, Underwriters Laboratories Inc. Richard P. Fogarty, Consolidated Edison of New Milton D. Robinson, Milt Robinson Engineering Co. York Rep. Institute of Electrical & Electronics Engineers, (Alt. to J. W. Troglia) Inc. Alfred D. Y. Pong, US Department of Veterans Truman C. Surbrook, Michigan State University Affairs Rep. American Society of Agricultural Engineers (Alt. to VA Rep.) Walter E. Thomas, Westinghouse Electric Corp. Robert L. Simpson, Simpson Electrical Engineer- Rep. National Electrical Manufacturers Association ing Co. John W. Troglia, Wisconsin Electric Power Co. (Alt. to M. D. Robinson) Rep. Electric Light Power Group/Edison Electric Samuel Solomon, Alameda County Electrical Institute (Alt. to W. A. Brunner) Ivan L. Winsett, Ronk Electrical Industries (Alt. to T. C. Surbrook) Raiph H. Young, Tennessee Eastman Co. (TEC) (Alt. to W. Kroboth) PANEL NO. 14-Articles 500, 501, 502, 503, 504, 510, 511, 513, 514, 515, 516 Richard J. Buschart, Chairman Chesterfield, MO Albert A. Bartkus, Underwriters Laboratories Inc. Alternates Joseph H. Kuczka, Killark Electric Mfg. Co. Rep. National Electrical Manufacturers Association Lawrence J. Adamcik, The Dow Chemical Company Francis J. McGowan, Factory Mutual Research (Alt. to D. W. Zipse) Corp. Alonza W. Ballard, Crouse-Hinds ECM Donald T. Murphy, Ralston Purina Co. (Alt. to J. Kuczka) Rep. American Feed Manufacturers Association, Inc. David N. Bishop, Chevron USA Inc. (Vote Limited to Articles 500 & 502) (Alt. to J. H. Rannells, Jr) Elliot M. Nesvig, Erdco Engineering Corporation Marion A. Cabler, Phillips Petroleum Co. Rep. Instrument Society of America (Alt. to CMA Rep) W. L. Raines, St Louis County Dept. of Public James D. Cospolich, Waldemar S. Nelson & Co. Inc. Works (Alt. to E. M. Nesvig) Rep. International Association of Electrical Milton L Foster, IBEW Inspectors (Alt. to J. A. Weldon) J H. Rannells, Amoco Oil Co. Pedro M. Garcia, Florida Power & Light Co. Rep. American Petroleum Institute (Alt. to L. C. Strachota) Carl R. Roselli, ANR Pipeline Co. Gerald W. Lemberg, Lemberg Electric Co. Inc. Mark G. Saban, Modern Electric Company of Illi- (Alt. to M. G. Saban) nois James M. Lynch, City of Chicago Rep. National Electrical Contractors Association (Alt. to W.L. Raines) Peter J. Schram, Braintree, MA David F. Moorhead, Blue Seal Feeds Inc. Harold B. Smith, Wunderlich-Malec Ing, Inc. (Alt. to D. T. Murphy) Rep. GEPS Ronald C. Vaickauski, Underwriters Laboratories Inc. Lawrence C. Strachota, Iowa Power & Light Co. (Alt. to A. A. Bartkus) Rep. Electric Light Power Group/Edison Electric Institute Nonvoting James A. Weldon, IBEW Local 728 Rep. International Brotherhood of Electrical John A. Bossert, Hazloc, Inc. Workers Vincent Rowe, Shell Canada Ltd. Donald W. Zipse, FMC Corp. (Alt. to J. Bossert) Rep. Institute of Electrical & Electronics Engi- Fred K. Walker, HQ United States Air Force neers, Inc. NATIONAL ELECTRICAL CODE COMMITTEE 70-xix PANEL NO. 15-Articles 445, 480, 518, 520, 530, 540, 700, 701, 702, 705 J. A. Stewart, Acting Chairman Jay Stewart Assoc. Inc. Joseph S. Dudor, Joseph S. Dudor, Consulting Michael Mowrey, IBEW Elec. Eng. Edward D. Rheaume, IBEW Local 970 Rep. Institute of Electrical & Electronics Engi- Rep. International Brotherhood of Electrical neers, Inc. Workers Robert C. Duncan, Reedy Creek Improvement Jay A. Stewart, Jay Stewart Assoc. Inc. District Rep. Chemical Manufacturers Association George W. Flach, Flach Consultants David G. Strasser, Marathon Electric Mfr. Corp. George T. Howard, George T. Howard Associates Rep. National Electrical Manufacturers Association LaVell J. Jensen, Utah Power & Light Co. Kenneth E. Vannice, Lee Colortran, Inc. Rep. Electric Light Power Group/Edison Electric Rep. US Institute of Theatre Technology Institute (Vote Limited to Articles 518, 520, 530, 540) Gordon S. Johnson, Dundee, FL Rep. Electrical Generating Systems Association Alternate (Vote Limited to Articles 445, 480, 700, 701, 702, 705) Anthony J. DeLuca, IBEW Local 313 Jack W. Kalbfeld, Kalico Technology Inc. (Alt. to M. Mowrey) (Vote Limited to Articles 518, 520, 530, 540) Michael V. Glenn, Longview Fibre Co. Michael B. Klein, Labyrinth Electrical, Inc. (Alt. to J. Dudor) Rep. Illuminating Engineering Society of North James R. Iverson, Onan Corp. America (Alt. to G. Johnson) J. J. Kubisz, Underwriters Laboratories Inc. Bobby J. Love, City of Houston, TX Michael A. Lanni, Universal City Studios (Alt. to IAEI Rep - Voting Alternate) Rep. Motion Picture Association of America, Inc. Randall Perdue, Arkansas Power & Light Company Keku M. Mistry, Bell Communications Research (Alt. to L. J. Jensen) Rep. Exchange Carriers Standards Association Charles G. Pounds, Dow Chemical USA (Vote Limited to Articles 445, 480, 700, 701, 702, (Alt. to J. Stewart) 705) Michael D. Skinner, CBS/MTM Studios (Alt. to M. A. Lanni) PANEL NO. 16-Articles 640, 650, 720, 725, 760, 770, 800, 810, 820 D. Harold Ware, Chairman Libra Electric Co. Rep. National Electrical Contractors Association Melvin J. Anna, Bell Communications Research Kyle E. Todd, Gulf States Utilities Co. Rep. Exchange Carriers Standards Association Rep. Electric Light Power Group/Edison Electric George J. Bagnall, Rural Electrification Admin Institute Charles D. Hansell, C. D. Hansell Consultants Inc. Inder L. Wadehra, IBM Corporation Rep. Institute of Electrical & Electronics Engineers, Rep. Computer & Business Equipment Manufac- Inc. turers Association David A. Heywood, US Testing Co. David Wechsler, Union Carbide Corp. Harry Katz, South Texas Electrical JATC Rep. Chemical Manufacturers Association Rep. International Brotherhood of Electrical Dean K. Wilson, Industrial Risk Insurers Workers Stanley Kaufman, AT&T Bell Laboratories Alternates Michael A. Lanni, Universal City Studios Rep. Motion Picture Association of America, Inc. David K. Baker, Superior Cable Corp. (Vote Limited to Articles 640, 720, 725, 760, 810, 820) (Alt. to V. B. Mascarenhas) Raymond I. Lease, Middle Dept. Inspection Ronald P. Cantrell, IBEW Local 72 Agency (Alt. to H. F. Katz) Rep. International Association of Electrical S E. Egesdal, Honeywell Inc. Inspectors (Alt. to I. Mande) Irving Mande, Edwards Co. Inc. Ellas Eduardo, Gil Houston Lighting & Power Co. Rep. National Electrical Manufacturers Association (Alt. to K. Todd) Vieney B. Mascarenhas, Canada Wire & Cable Ray A. Jones, EI. du Pont de Nemours & Co. Limited (Alt. to D. Wechsler) Rep. Insulated Cable Engineers Association Inc. Ronald G. Jones, Ronald G. Jones, PE William Pike, L & B. Enterprises (Alt. to C. D. Hansell) Rep. Building Industry Consulting Service Inter- John Mangan, Medford City Hall, MA national (Alt. to R. I. Lease Jr.) William L. Schallhammer, Underwriters Labora- Jan Rowland, Houston, TX tories Inc. (Alt. to A. E. Schlueter) Arthur E. Schlueter Jr, Pipe Organ Sales & Ser- (Vote Limited to Articles 640, 650, 720, 725) vice Inc. L H. Sessler, Cary, NC Rep. American Institute of Organ Builders/ (Alt. to M. J. Anna) Associated Pipe Organ Builders of America Gary W. Victorine, Hewlett-Packard Co. (Vote Limited to Articles 640, 650, 720, 725) (Alt. to I. Wadehra) James W. Stilwell, Tele Services R&D Rep. National Cable Television Association (Vote Limited to Articles 770, 800, 810, 820) 70-xx NATIONAL ELECTRICAL CODE PANEL NO. 17-Article 517 George Schuck, Chairman Rep. IBEW Local 3 D. R. Borden, Tri-City Electric Company Inc. Bradley Zempel, City of Seattle, WA Rep. National Electrical Contractors Association Rep. International Association of Electrical Timothy M. Croushore, Allegheny Power System, Inc. Inspectors Rep. Electric Light Power Group/Edison Electric Alternates Institute Floyd J. DeVore, General Electric Medical Steven Benesh, Square D. Co. Alvin Friendlich, Crown Electric Thomas H. Gilliam, Riverside Methodist Hospital (Alt. to F. J. DeVore) Thomas J. Castor, American Electric Power Rep. Association for the Advancement of Medical (Alt. to T. M. Croushore) Instrumentation James R. Duncan, Sparling & Associates, Inc. Glenn T. Keates, Harley, Ellington, Pierce, Yee Rep. Institute of Electrical & Electronics Engi- (Alt. to G. T. Keates) Douglas S. Erickson, American Hospital Associneers, Inc. Ode Richard Keil, Joint Commission on Accrediation (Alt. to G. D. Slack) tation of Healthcare Orgs Phillip W. Knight, Knight Electric Co. Inc. Stanley D. Kahn, Forest Electric Corporation Rep. Associated Builders and Contractors, Inc. (Alt. to D. R. Borden) Gerald L. Kavanaugh, IBEW Local 145 M. T. Merrigan, Underwriters Laboratories Inc. James A. Meyer, Pettis Memorial VA Hospital (Alt. to G. Schuck Jr) Elver L. Madsen, Montana Dept. Commerce/ Rep. American Society of Anesthesiologists Hugh O. Nash, Smith Seckman Reid Inc. Building Codes Bureau Gary D. Slack, Healthcare Engineering Consultants (Alt. to B. Zempel) Bryan Parker, Montefiore Hospital & Medical Rep. American Hospital Association Center Jeffrey L. Steplowski, Department of Veterans (Alt. to T. H. Gilliam) Affairs James E. Tyson, US Department of Veterans Duane J. Telecky, Washoe Medical Center Affairs Rep. NFPA Health Care Section (Alt. to J. L. Steplowski) PANEL NO. 18-Articles 410, 600, 605 A. F. KnicKrehm, Chairman The KnicKrehm Co. Rep. National Electrical Contractors Association Kenneth F. Kempel, Underwriters Laboratories Inc. Alternates E G. Kiener, Solar Turbine Inc. Rep. Institute of Electrical & Electronics Engi- Rudy T. Elam, Calspan Corp. (Alt. to E. G. Kiener) neers, Inc. Howard D. Hughes, Hughes Electric Co. Inc. Bernard J. Mezger, Bostrom Management Corp. (Alt. to A. F. KnicKrehm) Rep. American Home Lighting Institute Stephen G. Kieffer, Kieffer & Co. Inc. (Vote Limited to Article 410) Saul Rosenbaum, Leviton Mfg. Co. Inc. (Alt. to R. K. Wright) Robert M. Milatovich, Clark County Rep. National Electrical Manufacturers Association James P. Suttle, Ohio Edison Co. (Alt. to T. E. Trainor) Rep. Electric Light Power Group/Edison Electric Joe Mogan, Lithonia Lighting (Alt. to S. Rosenbaum) Institute John L. Revil, IBEW Local 223 Thomas E. Trainor, City of San Diego, CA (Alt. to IBEW Rep.) Rep. International Association of Electrical T M. Von Sprecken, Mississippi Power Co. Inspectors Jack Wells, Pass & Seymour/LeGrand (Alt. to J. P. Suttle) Randall K. Wright, Wright Sign Company Sidney Wolkin, Lightolier Inc. (Alt. to B. J. Mezger) Rep. Electric Sign Association (Vote Limited to Árticle 410) (Vote Limited to Article 600) PANEL NO. 19-Articles 545, 547, 550, 551, 553, 555, 604, 675 John H. Stricklin, Chairman State of Idaho Mountain Home, ID Rep. International Association of Electrical Inspectors Barry Bauman, Wisconsin Power & Light Co. James W. Finch, Kampgrounds of America, Inc. Rep. American Society of Agricultural Engineers (Vote Limited to Articles 550, 551) (Vote Limited to Articles 545, 547, 604, 675) Bruce A. Hopkins, Recreation Vehicle Industry Douglas R. Betts, Fleetwood Enterprises Inc. Association Rep. Manufactured Housing Institute (Vote Limited to Articles 550 & 551) (Vote Limited to Articles 550, 551) Melvin Kallenbach, Mel-Kay Electric Co. Inc. A. L. Buxton, Burndy Corp. Rep. National Electrical Contractors Association Rep. National Electrical Manufacturers Association Richard P. McEnroe, Mill Mutuals Itasca, IL Richard A. Clarey; IBEW Local 551 (Vote Limited to Article 547) Rep. International Brotherhood of Electrical Tug Miller, California Travel Parks Donald A. Nissen, Underwriters Laboratories, Inc. Workers Randol O. Farlow, Georgia Power Co. Henry Omson, US Department of Housing & Rep. Electric Light Power Group/Edison Electric Urban Development Institute (Vote Limited to Articles 545, 550, 551) NATIONAL ELECTRICAL CODE COMMITTEE 70-xxi Glenn C. Safford, Kirby Risk Supply Co Inc. Kent Perkins, Recreation Vehicle Industry Assn. Rep. National Association of Electrical Distributors (Alt. to B. A. Hopkins VL 550, 551) (Vote Limited to Articles 545, 547, 604, 675) Frank J. Potucek, Mill Mutuals Ed Starostovic, PFS Corp. (Alt. to R. P. McEnroe VL 547) Rep. National Association of Home Builders Howard Slemmer, State of Washington (Vote Limited to Articles 545, 547, 604, 675) (Alt. to J. H. Stricklin) Michael L. Zieman, Radco Homer Staves, Kampgrounds of America, Inc. (Alt. to J. Finch VL 550, 551) Alternates LaVerne E. Stetson, US Dept. of Agriculture (Alt. to B. Bauman) William C. Boteler, Hubbell Incorporated Raymond F. Tucker, RADCO (Alt. to A. L. Buxton) (Alt. to M. L. Zieman) Paul Duks, Underwriters Laboratories Inc. (Alt. to D. A. Nissen) Peter F. Locke, Northeast Utilities (Alt. to R. O. Farlow) PANEL NO. 20-Articles 422, 424, 426, 680 Russell J. Helmick, Chairman City of Irvine, CA Rep. International Association of Electrical Inspectors Art Buxbaum, City of San Diego, CA Robert M. Yurkanin, Electran Process Intl Inc. Edward S. Charkey, American Insurance Services Rep. Institute of Electrical & Electronics Engi- Group, Inc. neers, Inc. Ray Franklin, IBEW Rep. International Brotherhood of Electrical Alternates Workers Robert C. Lester, New York Board of Fire Under- R. L. Bunch, Tecumseh Products Company writers (Alt. to L. Van Tassel) Morris L. Markel, Mor-Mar Products, Inc. Kenneth J. Byrne, Virginia Power Rep. National Electrical Manufacturers Association (Alt. to L. Stambaugh) James R. McNicol, Brett Aqualine Inc. Richard E. King, IBEW Rep. National Spa and Pool Institute (Alt. to R. Franklin) (Vote Limited to Article 680) James N. Pearse, Leviton Mfg. Co. Inc. Herbert P. Spiegel, Corona Industrial Electric, Inc. (Alt. to M. Markel) Rep. National Electrical Contractors Association Joel A. Rencsok, City of Phoenix, AZ Leo Stambaugh, Texas Utilities Electric Co. (Alt. to R. J. Helmick) Rep. Electric Light Power Group/Edison Electric Institute Nonvoting Donald J. Talka, Underwriters Laboratories Inc. William H. King, US Consumer Product Safety Leon T. Uhl, Leon T. Uhl, PE Comm. Rep. Association of Home Appliance Manufacturers G W. Lawrence, Canadian Standards Association (Vote Limited to Articles 422, 424, 426) Leonard K. VanTassel, Carrier Air Conditioning Rep. Air Conditioning and Refrigeration Institute (Volume Limited to Articles 422, 424, 426) NOTE: Membership on a Committee shall not in and of itself constitute an endorsement of the Association or any document developed by the Committee on which the member serves. 70-1 National Electrical Code NFPA 70