COMMUNITY ANTENNA TELEVISION

AND RADIO DISTRIBUTION SYSTEMS A. General 820-1. Scope. This article covers coaxial cable distribution of radio frequency signals typically employed in community antenna television (CATV) systems. (FPN): Where the installation is other than coaxial, see Articles 770 and 800 as applicable. ARTICLE 820 - COMMUNITY ANTENNA TELEVISION 70-811 820-2. Energy Limitations. The coaxial cable shall be permitted to deliver low-energy power to equipment directly associated with the radio frequency distribution system if the voltage is not over 60 volts and if the current supply is from a transformer or other device having energy-limiting characteristics. 820-3. Definitions. See Article 100. For the purposes of this Article, the following additional definition applies: Point of Entrance. The point of entrance within a building is the point at which the cable emerges from an external wall, from a concrete floor slab, or from a rigid metal conduit or an intermediate metal conduit grounded to an electrode in accordance with Section 820-40(b). 820-5. Access to Electrical Equipment Behind Panels Designed to Allow Access. Access to equipment shall not be denied by an accumulation of wires and cables that prevents removal of panels, including suspended ceiling panels. 820-6. Mechanical Execution of Work. Community antenna television and radio distribution systems shall be installed in a neat and workmanlike manner. B. Cables Outside and Entering Buildings 820-10. Outside Cables. Coaxial cables, prior to the point of grounding, as defined in Section 820-33, shall comply with (a) through (e) below. (a) On Poles. Where practicable, conductors on poles shall be located below the electric light or power conductors and shall not be attached to a cross-arm that carries electric light or power conductors. (b) Lead-in Clearance. Lead-in or aerial-drop cables from a pole or other support, including the point of initial attachment to a building or structure, shall be kept away from electric light or power circuits so as to avoid the possibility of accidental contact. Exception: Where proximity to electric light or power service conductors cannot be avoided, the installation shall be such as to provide clearances of not less than 12 inches (305 mm) from light or power service drops. (c) Above Roofs. Cables shall have a vertical clearance of not less than 8 feet (2.44 m) from all points of roofs above which they pass. Exception No. 1: Auxiliary buildings such as garages and the like. Exception No. 2: A reduction in clearance above only the overhanging portion of the roof to not less than 18 inches (457 mm) shall be permitted if (1) not more than 4 feet (1.22 m) of communication service drop conductors pass above the roof overhang, and (2) they are terminated at a through-the-roof raceway or support. Exception No. 3: Where the roof has a slope not less than 4 inches (102 mm) in 12 inches (305 mm), a reduction in clearance to not less than 3 feet (914 mm) shall be permitted. 70-812 NATIONAL ELECTRICAL CODE (d) Between Buildings. Cables extending between buildings and also the supports or attachment fixtures shall be acceptable for the purpose and shall have sufficient strength to withstand the loads to which they may be subjected. Exception: Where a cable does not have sufficient strength to be selfsupporting, it shall be attached to a supporting messenger cable that, together with the attachment fixtures or supports, shall be acceptable for the purpose and shall have sufficient strength to withstand the loads to which they may be subjected. (e) On Buildings. Where attached to buildings, cables shall be securely fastened in such a manner that they will be separated from other conductors as follows: (1) Electric Light or Power. The coaxial cable shall have a separation of at least 4 inches (102 mm) from electric light or power conductors not in raceway or cable, or be permanently separated from conductors of the other system by a continuous and firmly fixed nonconductor in addition to the insulation on the wires. (2) Other Communications Systems. Coaxial cable shall be installed so that there will be no unnecessary interference in the maintenance of the separate systems. In no case shall the conductors, cables, messenger strand, or equipment of one system cause abrasion to the conductors, cable, messenger strand, or equipment of any other system. (3) Lightning Conductors. Where practicable, a separation of at least conductors. 6 feet (1.83 m) shall be maintained between any coaxial cable and lightning 820-11. Entering Buildings. (a) Underground Systems. Underground coaxial cables in a duct, pedestal, handhole, or manhole containing electric light or power conductors or Class 1 circuits shall be in a section permanently separated from such conductors by means of a suitable barrier. (b) Direct Buried Cables and Raceways. Direct buried coaxial cable shall be separated at least 12 inches (305 mm) from conductors of any light or power or Class 1 circuit. Exception No. 1: Where electric service conductors or coaxial cables are installed in raceways or have metal cable armor. Exception No. 2: Where electric light or power branch-circuit or feeder conductors or Class 1 circuit conductors are installed in a raceway or in metal-sheathed, metal-clad, or Type UF or Type USE cables; or the coaxial cables have metal cable armor or are installed in a raceway. C. Protection 820-33. Grounding of Outer Conductive Shield of a Coaxial Cable. Where coaxial cable is exposed to lightning or to accidental contact with lightning arrester conductors or power conductors operating at a voltage of over 300 volts to ground, the outer conductive shield of the coaxial cable shall be grounded at the building premises as close to the point of cable entry as practicable. For purposes of this section, the point at which the ARTICLE 820 - COMMUNITY ANTENNA TELEVISION 70-813 exposed cable enters shall be considered to be the point of emergence through an exterior wall, a concrete floor slab, or from a rigid or intermediate metal conduit grounded to an electrode in accordance with Section 820-40(b). For purposes of this section, grounding located at mobile home service equipment located in sight from and no more than 30 feet (9.14 m) from the exterior wall of the mobile home it serves, or at a mobile home disconnecting means grounded in accordance with Section 250-24 and located in sight from and not more than 30 feet (9.14 m) from the exterior wall of the mobile home it serves, shall be considered to meet the requirements of this section. (FPN): Selecting a grounding location to achieve the shortest practicable grounding conductor will help limit potential differences between CATV and other metallic systems. (a) Shield Grounding. Where the outer conductive shield of a coaxial cable is grounded, no other protective devices shall be required. (b) Shield Protection Devices. Grounding of a coaxial drop cable shield by means of a protective device that does not interrupt the grounding system within the premises shall be permitted. D. Grounding Methods 820-40. Cable Grounding. Where required by Section 820-33, the shield of the coaxial cable shall be grounded as specified in (a) through (d) below. (a) Grounding Conductor. (1) Insulation. The grounding conductor shall be insulated and shall be listed as suitable for the purpose. (2) Material. The grounding conductor shall be copper or other corrosion-resistant conductive material, stranded or solid. (3) Size. The grounding conductor shall not be smaller than No. 14; it shall have a current-carrying capacity approximately equal to that of the outer conductor of the coaxial cable. (4) Run in Straight Line. The grounding conductor shall be run to the grounding electrode in as straight a line as practicable. (5) Physical Protection. Where subject to physical damage, the grounding conductor shall be adequately protected. Where the grounding conductor is run in a metal raceway, both ends of the raceway shall be bonded to the grounding conductor or the same terminal or electrode to which the grounding conductor is connected. (b) Electrode. The grounding conductor shall be connected as follows: (1) To the nearest accessible location on (1) the building or structure grounding electrode system as covered in Section 250-81, (2) the grounded interior metal water piping system as covered in Section 250-80(a), (3) the power service accessible means external to enclosures as covered in Section 250-71(b), (4) the metallic power service raceway, (5) the service equipment enclosure, (6) the grounding electrode conductor or the grounding electrode conductor metal enclosure, or (7) to the grounding conductor or to the grounding electrode of a building or structure disconnecting means that is grounded to an electrode as covered in Section 250-24; or 70-814 NATIONAL ELECTRICAL CODE (2) If the building or structure served has no grounding means as described in (b)(1), to any one of the individual electrodes described in Section 250-81; or (3) If the building or structure served has no grounding means as described in (b)(1) or (b)(2), to (1) an effectively grounded metal structure or (2) to any one of the individual electrodes described in Section 250-83. (c) Electrode Connection. Connections to grounding electrodes shall comply with Section 250-115. (d) Bonding of Electrodes. A bonding jumper not smaller than No. 6 copper or equivalent shall be connected between the antenna systems grounding electrode and the power grounding electrode system at the building or structure served where separate electrodes are used. Exception: At mobile homes as covered in Section 820-42. (FPN No. 1): See Section 250-86 for use of lightning rods. (FPN No. 2): Bonding together of all separate electrodes will limit potential differences between them and between their associated wiring systems. 820-41. Equipment Grounding. Unpowered equipment and enclosures or equipment powered by the coaxial cable shall be considered grounded where connected to the metallic cable shield. 820-42. Bonding and Grounding at Mobile Homes. (a) Grounding. Where there is no mobile home service equipment located in sight from and not more than 30 feet (9.14 m) from the exterior wall of the mobile home it serves, or there is no mobile home disconnecting means grounded in accordance with Section 250-24 and located within sight from and not more than 30 feet (9.14 m) from the exterior wall of the mobile home it serves, the coaxial cable shield ground, or surge arrester ground, shall be in accordance with Sections 820-40(b) (2) and (3). (b) Bonding. The coaxial cable shield grounding terminal, surge arrester grounding terminal, or grounding electrode shall be bonded to the metal frame or available grounding terminal of the mobile home with a copper grounding conductor not smaller than No. 12 under any of the following conditions: (1) Where there is no mobile home service equipment or disconnecting means as in (a) above, or (2) Where the mobile home is supplied by cord and plug. E. Cables Within Buildings 820-49. Fire Resistance of CATV Cables. Coaxial cables installed as wiring within buildings shall be listed as being resistant to the spread of fire in accordance with Sections 820-50 and 820-51. 820-50. Listing, Marking, and Installation of Coaxial Cables. Coaxial cables in a building shall be listed as being suitable for the purpose, and cables shall be marked in accordance with Table 820-50. The cable voltage rating shall not be marked on the cable. ARTICLE 820 - COMMUNITY ANTENNA TELEVISION 70-815 (FPN): Voltage markings on cables may be misinterpreted to suggest that the cables may be suitable for Class 1, electric light and power applications. Exception No. 1: Voltage markings shall be permitted where the cable has multiple listings and voltage marking is required for one or more of the listings. Exception No. 2: Listing and marking shall not be required where the cable enters the building from the outside and is run in rigid metal conduit or intermediate metal conduit, and such conduits are grounded to an electrode in accordance with Section 820-40(b). Exception No. 3: Listing and marking shall not be required where the length of cable within the building does not exceed 50 feet (15.2 m) and the cable enters the building from the outside and is terminated at a grounding block. Table 820-50. Cable Markings Cable Marking Type Reference CATVP CATV plenum cable Sections 820-51(a) and 820-53(a) CATVR CATV riser cable Sections 820-51(b) and 820-53(b) CATV CATV cable Sections 820-51(c) and 820-53(c) CATVX CATV cable, limited use Sections 820-51(d) and 820-53(c), Exception Nos. 1, 2, and 3 (FPN No. 1): Cable types are listed in descending order of fire-resistance rating. (FPN No. 2): See the referenced sections for listing requirements and permitted uses. 820-51. Additional Listing Requirements. Cables shall be listed in accordance with (a) through (d) below. (a) Type CATVP. Type CATVP community antenna television plenum cable shall be listed as being suitable for use in ducts, plenums, and other space used for environmental air and shall also be listed as having adequate fire-resistant and low-smoke-producing characteristics. (FPN): One method of defining low-smoke-producing cables is by establishing an acceptable value of the smoke produced when tested in accordance with the Test for Fire and Smoke Characteristics of Wires and Cables, NFPA 262-1990 (ANSI), I to a maximum peak optical density of 0.5 and a maximum average optical density of 0.15. Similarly, one method of defining fire-resistant cables is by establishing maximum allowable flame travel distance of 5 feet (1.52 m) when tested in accordance with the same test. (b) Type CATVR. Type CATVR community antenna television riser cable shall be listed as being suitable for use in a vertical run in a shaft or from floor to floor and shall also be listed as having fire-resistant characteristics capable of preventing the carrying of fire from floor to floor. 70-816 NATIONAL ELECTRICAL CODE (FPN): One method of defining fire-resistant characteristics capable of preventing the carrying of fire from floor to floor is that the cables pass the requirements of the Standard Test for Flame Propagation Height of Electrical and Optical-Fiber Cable Installed Vertically in Shafts, ANSI/UL 1666-1986. (c) Type CATV. Type CATV community antenna television cable shall be listed as being suitable for general purpose CATV use, with the exception of risers and plenums, and shall also be listed as being resistant to the spread of fire. (FPN): One method of defining resistant to the spread of fire is that the cables do not spread fire to the top of the tray in the "Vertical-Tray Flame Test" in the Reference 1581-1985. Standard for Electrical Wires, Cables and Flexible Cords, ANSI/UL Another method of defining resistant to the spread of fire is for the damage (char length) not to exceed 4 feet 11 inches (1.5 m) when performing the "Vertical Flame Test-Cables in Cable Trays," as described in Test Methods for Electrical Wires and Cables, CSA C22.2 No. 0.3-M-1985. (d) Type CATVX. Type CATVX limited-use community antenna television cable shall be listed as being suitable for use in dwellings and for use in raceway and shall also be listed as being flame-retardant. (FPN): One method of determining that cable is flame-retardant is by testing the cable to the "VW-1 (Vertical-Wire) Flame Test" in the Reference Standard for Electrical Wires, Cables and Flexible Cords, ANSI/UL 1581-1985. 820-52. Installation of Cables and Equipment. Beyond the point of grounding, as defined in Section 820-33, the cable installation shall comply I with (a) through (e) below. (a) Separation from Other Conductors. (1) Open Conductors. Coaxial cable shall be separated at least 2 inches (50.8 mm) from conductors of any electric light or power circuits or Class 1 circuits. Exception No. 1: Where the electric light or power or Class 1 or coaxial cable circuit conductors are in a raceway, or in metal-sheathed, metalclad, nonmetallic-sheathed, or Type UF cables. Exception No. 2: Where the conductors are permanently separated from the conductors of the other circuits by a continuous and firmly fixed nonconductor, such as porcelain tubes or flexible tubing, in addition to the insulation on the wire. (2) In Enclosures and Raceways. a. Other Power-Limited Circuits. Coaxial cables shall be permitfollowing: ted in the same raceway or enclosure with jacketed cables of any of the 1. Class 2 and Class 3 remote-control, signaling, and powerlimited circuits in compliance with Article 725. 2. Power-limited fire protective signaling systems in compliance with Article 760. 3. Communications circuits in compliance with Article 800. 4. Optical fiber cables in compliance with Article 770. ARTICLE 820 - COMMUNITY ANTENNA TELEVISION 70-817 b. Electric Light or Power Circuits. Coaxial cable shall not be placed in any raceway, compartment, outlet box, junction box, or other enclosures with conductors of electric light or power or Class 1 circuits. Exception No. 1: Where the conductors of the different systems are separated by a permanent barrier. Exception No. 2: Conductors in outlet boxes, junction boxes, or similar fittings or compartments where such conductors are introduced solely for power supply to the coaxial cable system distribution equipment or for power connection to remote-control equipment. The electric light, power, and Class 1 circuit conductors and nonpowerlimited fire protective signaling circuit conductors shall be routed within the enclosure to maintain a minimum 0.25-inch (6.35-mm) separation from the coaxial cable. (3) In Shafts. Coaxial cables run in the same shaft with conductors of electric light or power shall be separated from electric light or power conductors by not less than 2 inches (50.8 mm). Exception No. 1: Where the conductors of either system are encased in metal raceway. Exception No. 2: Where the electric light or power conductors are in raceway, or in metal-sheathed, metal-clad, nonmetallic-sheathed, or Type UF cables. (b) Spread of Fire or Products of Combustion. Installations in hollow spaces, vertical shafts, and ventilation or air-handling ducts shall be so made that the possible spread of fire or products of combustion will not be substantially increased. Openings around penetrations through fireresistance-rated walls, partitions, floors, or ceilings shall be firestopped using approved methods. (c) Equipment in Other Space Used for Environmental Air. Section 300-22(c) shall apply. (d) Hybrid Power and Coaxial Cabling. The provisions of Section 780-6 shall apply for listed hybrid power and coaxial cabling in closed-loop and programmed power distribution. (e) Support of Conductors. Raceways shall not be used as a means of support for coaxial cables. 820-53. Applications of Listed CATV Cables. CATV cables shall comply with (a) through (d) below. (a) Plenum. Cables installed in ducts, plenums, and other spaces used for environmental air shall be Type CATVP. Exception: Types CATVP, CATVR, CATV, and CATVX cables installed in compliance with Section 300-22. (b) Riser. Cables installed in vertical runs and penetrating more than one floor, or cables installed in vertical runs in a shaft, shall be Type CATVR. Floor penetrations requiring Type CATVR shall contain only cables suitable for riser or plenum use. Exception No. 1: Types CATV and CATVX cables encased in metal raceway or located in a fireproof shaft having firestops at each floor. 70-818 NATIONAL ELECTRICAL CODE Exception No. 2: Types CATV and CATVX cables in one- and twofamily dwellings. (FPN): See Section 820-52(b) for the firestop requirements for floor penetrations. (c) Other Wiring Within Buildings. Cables installed in building locations other than the locations covered in (a) and (b) above shall be Type CATV. Exception No. 1: Type CATVX cable enclosed in raceway. Exception No. 2: Type CATVX cable in nonconcealed spaces where the exposed length of cable does not exceed 10 feet (3.05 m). Exception No. 3: Type CATVX cables that are less than .375 inch (9.52 mm) in diameter and installed in one- or two-family dwellings. Exception No. 4: Type CATVX cables that are less than .375 inch (9.52 mm) in diameter and installed in nonconcealed spaces in multifamily dwellings. (d) Cable Substitutions. The substitutions for community antenna television cables listed in Table 820-53 shall be permitted. Table 820-53. Coaxial Cable Substitutions Cable Type Permitted Substitutions CATVP MPP, CMP CATVR CATVP, MPP, CMP, MPR, CMR CATV CATVP, MPP, CMP, CATVR, MPR, CMR, MPG, MP, CMG, CM CATVX CATVP, MPP, CMP, CATVR, MPR, CMR, CATV, MPG, MP, CMG, CM 70-819 Chapter 9 Tables and Examples A. Tables Notes to Tables 1. Tables 3A, 3B, and 3C apply only to complete conduit or tubing systems and are not intended to apply to sections of conduit or tubing used to protect exposed wiring from physical damage. 2. Equipment grounding or bonding conductors, where installed, shall be included when calculating conduit or tubing fill. The actual dimensions of the equipment grounding or bonding conductor (insulated or bare) shall be used in the calculation. 3. Where conduit or tubing nipples having a maximum length not to exceed 24 inches (610 mm) are installed between boxes, cabinets, and similar enclosures, the nipple shall be permitted to be filled to 60 percent of its total cross-sectional area, and Article 310, Note 8(a) of Notes to Ampacity Tables of 0 to 2000 Volts need not apply to this condition. 4. For conductors not included in Chapter 9, such as multiconductor cables, the actual dimensions shall be used. 5. See Table 1 for allowable percentage of conduit or tubing fill. (FPN): Table 1 is based on common conditions of proper cabling and alignment of conductors where the length of the pull and the number of bends are within reasonable limits. It should be recognized that for certain conditions a larger size conduit or a lesser conduit fill should be considered. Table 1. Percent of Cross Section of Conduit and Tubing for Conductors (See Table 2 for Fixture Wires) Number of Conductors 1 2 3 4 Over 4 All conductor types 53 31 40 40 40 except lead-covered Lead-covered conductors 55 30 40 38 35 Note 1. See Tables 3A, 3B, and 3C for number of conductors all of the same size in trade sizes of conduit or tubing ½ inch through 6 inch. Note 2: See Table 5B for number of compact conductors all of the same size in trade sizes of conduit or tubing ½ inch through 4 inch. Note 3. For conductors larger than 750 kcmil or for combinations of conductors of different sizes, use Tables 4 through 8, Chapter 9, for dimensions of conductors, conduit, and tubing. Note 4. Where the calculated conductors, all of the same size (total cross-sectional area including insulation), include a decimal fraction, the next higher whole number shall be used where this decimal is 0.8 or larger. Note 5. Where bare conductors are permitted by other sections of this Code, the dimensions for bare conductors in Table 8 of Chapter 9 shall be permitted. Note 6. A multiconductor cable of two or more conductors shall be treated as a single conductor cable for calculating percentage conduit fill area. For cables that have elliptical cross section, the cross-sectional area calculation shall be based on using the major diameter of the ellipse as a circle diameter. Table 2. Maximum Number of Fixture Wires in Trade Sizes of Conduit or Tubing (40 Percent Fill Based on Individual Diameters) Conduit 70-820 Trade Size (Inches) 1/2 3/4 1 1½ 1½ 2 Wire Types 18 16 14 12 10 18 16 14 12 10 18 16 14 12 10 18 16 14 12 10 18 16 14 12 10 18 16 14 12 10 PTF, PTFF, PGFF, PGF, PFF, PF, PAF, PAFF, ZF, ZFF 23 18 14 40 31 24 65 50 39 115 90 70 157 122 95 257 200 156 TFFN, TFN 19 15 34 26 55 43 97 76 132 104 216 169 SF-1 16 29 47 83 114 186 SFF-1 15 26 43 76 104 169 TF 11 10 20 18 32 30 57 53 79 72 129 118 RFH-1 11 20 32 57 79 129 TFF 11 10 20 17 32 27 56 49 77 66 126 109 NATIONAL ELECTRICAL CODE AF 11 9 7 4 3 19 16 12 7 5 31 26 20 11 8 55 46 36 19 15 75 63 49 27 20 123 104 81 44 34 SFF-2 9 7 6 16 12 10 27 20 17 47 36 30 65 49 42 106 81 68 SF-2 9 8 6 16 14 11 27 23 18 47 40 32 65 55 43 106 90 71 FFH-2 9 7 15 12 25 19 44 34 60 46 99 75 RFH-2 7 5 12 10 20 16 36 28 49 38 80 62 KF-1, KFF-1, KF-2, KFF-2 36 32 22 14 9 64 55 39 25 17 103 89 63 41 28 182 158 111 73 49 248 216 152 100 67 406 353 248 163 110 Table 3A. Maximum Number of Conductors in Trade Sizes of Conduit or Tubing (Based on Table 1, Chapter 9) Conduit or Tubing Trade Size (Inches) ½ 3/4 1 1½ 1½ 2 2½ 3 3½ 4 5 6 Conductor Size Type Letters AWG/kcmil TW, XHHW 14 9 15 25 44 60 99 142 (14 through 18) 12 7 12 19 35 47 78 111 171 RH (14 + 12) 10 5 9 15 26 36 60 85 131 176 8 2 4 7 12 17 28 40 62 84 108 RHW and RHH 14 6 10 16 29 40 65 93 143 192 (without outer 12 4 8 13 24 32 53 76 117 157 covering), 10 4 6 11 19 26 43 61 95 127 163 RH (10 + 8) 8 1 3 5 10 13 22 32 49 66 85 133 THW, THHW TW, 6 1 2 4 7 10 16 23 36 48 62 97 141 4 1 1 3 5 7 12 17 27 36 47 73 106 THW, 3 1 1 2 4 6 10 15 23 31 40 63 91 2 1 1 2 4 5 9 13 20 27 34 54 78 CHAPTER 9 - TABLES AND EXAMPLES 1 1 1 3 4 6 9 14 19 25 39 57 FEPB (6 through 2), 1/0 1 1 2 3 5 8 12 16 21 33 49 RHW and RHH (with- 2/0 1 1 1 3 5 7 10 14 18 29 41 out outer 3/0 1 1 1 2 4 6 9 12 15 24 35 covering) 4/0 1 1 1 3 5 7 10 13 20 29 250 1 1 1 2 4 6 8 10 16 23 300 1 1 1 2 3 5 7 9 14 20 350 1 1 1 3 4 6 8 12 18 400 1 1 1 2 4 5 7 11 16 RH, THHW 500 1 1 1 1 3 4 6 9 14 600 1 1 1 3 4 5 7 11 700 1 1 1 2 3 4 7 10 750 1 1 1 2 3 4 6 9 70-821 Note 1. This table is for concentric stranded conductors only. For cables with compact conductors, the dimensions in Table 5A shall be used. Note 2. Conduit fill for conductors with a -2 suffix is the same as for those types without the suffix. Table 3B. Maximum Number of Conductors in Trade Sizes of Conduit or Tubing (Based on Table 1, Chapter 9) 70-822 Conduit or Tubing Trade Size (Inches) 1/2 3/4 1 1½ 1½ 2 2½ 3 3½ 4 5 6 Conductor Size Type Letters AWG/kcmil 14 13 24 39 69 94 154 12 10 THWN, 18 29 51 70 114 164 10 6 11 18 32 44 73 104 160 8 3 5 9 16 22 36 51 79 106 136 THHN, 6 1 4 6 11 15 26 37 57 76 98 154 FEP (14 through 2), 4 1 2 4 7 9 16 22 35 47 60 94 137 FEPB (14 through 8), 3 1 1 3 6 8 13 19 29 39 51 80 116 PFA (14 through 4/0) 2 1 1 3 5 7 11 16 25 33 43 67 97 PFAH (14 through 4/0) 1 1 1 3 5 8 12 18 25 32 50 72 Z (14 through 4/0) 1/0 1 1 3 4 7 10 15 21 27 XHHW (4 through 42 61 2/0 1 1 2 3 6 8 13 17 22 500 kcmil) 35 51 3/0 1 1 1 3 5 7 11 14 18 29 42 4/0 1 1 1 2 4 6 9 12 15 NATIONAL ELECTRICAL CODE 24 35 250 1 1 1 3 4 7 10 12 20 28 300 1 1 1 3 4 6 8 11 17 24 350 1 1 1 2 3 5 7 9 15 21 400 1 1 1 3 5 6 8 13 19 500 1 1 1 2 4 5 7 11 16 600 1 1 1 1 3 4 5 9 13 700 1 1 1 3 4 5 8 11 750 1 1 1 2 3 4 7 11 XHHW 6 1 3 5 9 13 21 30 47 63 81 128 185 600 1 1 1 1 3 4 5 9 13 700 1 1 1 3 4 5 7 11 750 1 1 1 2 3 4 7 10 Note 1. This table is for concentric stranded conductors only. For cables with compact conductors, the dimensions in Table 5A shall be used. I Note 2. Conduit fill for conductors with a -2 suffix is the same as for those types without the suffix. Table 3C. Maximum Number of Conductors in Trade Sizes of Conduit or Tubing (Based on Table 1, Chapter 9) Conduit or Tubing Trade Size (Inches) 1/2 3/4 1 11/4 1½ 2 2½ 3 3½ 4 5 6 Conductor Size Type Letters AWG/kcmil 14 3 6 10 18 25 41 58 90 121 155 12 3 5 9 15 21 35 50 77 103 132 RHW, 10 2 4 7 13 18 29 41 64 86 110 8 1 2 4 7 9 16 22 35 47 60 94 137 RHH 6 1 1 2 5 6 11 15 24 32 41 64 93 4 1 1 1 3 5 8 12 18 24 31 50 72 (with 3 1 1 1 3 4 7 10 16 22 28 44 63 outer 2 1 1 3 4 6 9 14 19 24 38 56 covering) 1 1 1 1 3 5 7 11 14 18 29 42 1/0 1 1 1 2 4 6 9 12 16 25 37 2/0 1 1 1 3 5 8 11 14 22 32 3/0 1 1 1 3 4 7 9 12 19 28 CHAPTER 9 - TABLES AND EXAMPLES 4/0 1 1 1 2 4 6 8 10 16 24 250 1 1 1 3 5 6 8 13 19 300 1 1 1 3 4 5 7 11 17 350 1 1 1 2 4 5 6 10 15 400 1 1 1 1 3 4 6 9 14 500 1 1 1 1 3 4 5 8 11 600 1 1 1 2 3 4 6 9 700 1 1 1 1 3 3 6 8 750 1 1 1 3 3 5 8 Note 1. This table is for concentric stranded conductors only. For cables with compact conductors, the dimensions in Table 5A shall be used. Note 2. Conduit fill for conductors with a -2 suffix is the same as for those types without the suffix. 70-823 Tables 4 through 8, Chapter 9. Tables 4 through 8 give the nominal size of conductors and conduit or tubing for use in computing size of conduit or tubing for various combinations of conductors. The dimensions represent average conditions only, and variations will be found in dimensions of conductors and conduits of different manufacture. 70-824 Table 4. Dimensions and Percent Area of Conduit and of Tubing Areas of Conduit or Tubing for the Combinations of Wires Permitted in Table 1, Chapter 9. Area - Square Inches Not Lead-Covered Lead-Covered Internal Over 2 Over 4 Trade Diameter Total 2 Cond. Cond. 1 Cond. 1 Cond. 2 Cond. 3 Cond. 4 Cond. Cond. Size Inches 100% 31% 40% 53% 55% 30% 40% 38% 35% ½ .622 .30 .09 .12 .16 .17 .09 .12 .11 .11 3/4 .824 .53 .16 .21 .28 .29 .16 .21 .20 .19 1 1.049 .86 .27 .34 .46 .47 .26 .34 .33 .30 1½ 1.380 1.50 .47 .60 .80 .83 .45 .60 .57 .53 1½ 1.610 2.04 .63 .82 1.08 1.12 .61 .82 .78 .71 2 2.067 3.36 1.04 1.34 1.78 1.85 1.01 1.34 1.28 1.18 2½ 2.469 4.79 1.48 1.92 2.54 2.63 1.44 1.92 1.82 1.68 3 3.068 7.38 2.26 2.95 3.91 4.06 2.21 2.95 2.80