Resolución 2535: adopta el Código Eléctrico Nacional, versión 1993. (Sustituye el Anejo A del Reglamento 4435)

Exception No. 2: For an appliance, other than a motor-operated appliance, that is continuously loaded, the branch-circuit rating shall not be less than 125 percent of the marked rating; or not less than 100 percent if I the branch-circuit device and its assembly are listed for continuous loading at 100 percent of its rating. Exception No. 3: Branch circuits for household cooking appliances shall be permitted to be in accordance with Table 220-19. (b) Circuits Supplying Two or More Loads. For branch circuits supplying appliance and other loads, the rating shall be determined in accordance with Section 210-23. 422-5. Branch-Circuit Overcurrent Protection. Branch circuits shall be protected in accordance with Section 240-3. If a protective device rating is marked on an appliance, the branchcircuit overcurrent device rating shall not exceed the protective device rating marked on the appliance. C. Installation of Appliances 422-6. General. All appliances shall be installed in an approved manner. 422-7. Central Heating Equipment. Central heating equipment other than fixed electric space heating equipment shall be supplied by an individual branch circuit. Exception: Auxiliary equipment such as a pump, valve, humidifier, or electrostatic air cleaner directly associated with the heating equipment shall be permitted to be connected to the same branch circuit. ARTICLE 422 - APPLIANCES 70-353 422-8. Flexible Cords. (a) Heater Cords. All cord- and plug-connected smoothing irons and electrically heated appliances that are rated at more than 50 watts and produce temperatures in excess of 121°C (250°F) on surfaces with which the cord is likely to be in contact shall be provided with one of the types of approved heater cords listed in Table 400-4. (b) Other Heating Appliances. All other cord- and plug-connected electrically heated appliances shall be connected with one of the approved types of cord listed in Table 400-4, selected in accordance with the usage specified in that table. (c) Other Appliances. Flexible cord shall be permitted (1) for connection of appliances to facilitate their frequent interchange or to prevent the transmission of noise or vibration or (2) to facilitate the removal or disconnection of appliances that are fastened in place, where the fastening means and mechanical connections are specifically designed to permit ready removal for maintenance or repair, and the appliance is intended or identified for flexible cord connection. (d) Specific Appliances. (1) Electrically operated kitchen waste disposers intended for dwelling unit use shall be permitted to be cord-and-plug connected with a flexible cord identified for the purpose, terminated with a grounding-type attachment plug where all of the following conditions are met: a. The length of the cord shall not be less than 18 inches (457 mm) and not over 36 inches (914 mm). b. Receptacles shall be located to avoid physical damage to the flexible cord. c. The receptacle shall be accessible. (2) Built-in dishwashers and trash compactors intended for dwelling use shall be permitted to be cord-and-plug connected with a flexible cord identified for the purpose, terminated with a grounding-type attachment plug where all of the following conditions are met: a. The length of the cord shall be 3 to 4 feet (0.914 to1.22 m). b. Receptacles shall be located to avoid physical damage to the flexible cord. c. The receptacle shall be located in the space occupied by the appliance or adjacent thereto. d. The receptacle shall be accessible. Exception: Listed kitchen waste disposers, dishwashers, and trash compactors protected by a system of double insulation, or its equivalent, shall not be required to be grounded. Where such a system is employed, the equipment shall be distinctively marked. (3) Cord- and plug-connected high-pressure spray washing machines shall be provided with factory-installed ground-fault circuit-interrupter protection for personnel. The ground-fault circuit-interrupter shall be an integral part of the attachment plug or shall be located in the supply cord within 12 inches (305 mm) of the attachment plug. 70-354 NATIONAL ELECTRICAL CODE Exception No. 1: A high-pressure spray washer protected by a system of double insulation if such a unit is provided with a permanent warning indicating that it shall be connected to a receptacle protected by a groundfault circuit-interrupter. Exception No. 2: A high-pressure spray washer rated for a 3-phase supply system. Exception No. 3: A high-pressure spray washer rated over 250 volts. 422-9. Cord- and Plug-Connected Immersion Heaters. Electric heaters of the cord- and plug-connected immersion type shall be so constructed and installed that current-carrying parts are effectively insulated from electrical contact with the substance in which they are immersed. 422-10. Protection of Combustible Material. Each electrically heated appliance that is intended by size, weight, and service to be located in a fixed position shall be so placed as to provide ample protection between the appliance and adjacent combustible material. 422-11. Stands for Cord- and Plug-Connected Appliances. Each smoothing iron and other cord- and plug-connected electrically heated appliance intended to be applied to combustible material shall be equipped with an approved stand, which shall be permitted to be a separate piece of equipment or a part of the appliance. 422-12. Signals for Heated Appliances. In other than dwelling-type occupancies, each electrically heated appliance or group of appliances intended to be applied to combustible material shall be provided with a signal. Exception: If an appliance is provided with an integral temperaturelimiting device. 422-13. Flatirons. Electrically heated smoothing irons shall be equipped with an identified temperature-limiting means. 422-14. Water Heaters. (a) Storage- and Instantaneous-type Water Heaters. Each storage- or instantaneous-type water heater shall be equipped with a temperaturelimiting means in addition to its control thermostat to disconnect all ungrounded conductors, and such means shall be (1) installed to sense maximum water temperature and (2) either a trip-free, manually reset type or a type having a replacement element. Such water heaters shall be marked to require the installation of a temperature and pressure relief valve. (FPN): See Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22-1986. Exception: Water heaters with supply water temperature of 82°C (180°F) or above and a capacity of 60 kW or above and identified as being suitable for this use; and water heaters with a capacity of 1 gallon (3.785 L) or less and identified as being suitable for such use. ARTICLE 422 - APPLIANCES 70-355 (b) Storage-type Water Heaters. A branch circuit supplying a fixed storage-type water heater having a capacity of 120 gallons (454.2L) or less shall have a rating not less than 125 percent of the nameplate rating of the water heater. (FPN): For branch-circuit sizing, see Section 422-4(a), Exception No. 2. 422-15. Infrared Lamp Industrial Heating Appliances. (a) 300 Watts or Less. Infrared heating lamps rated at 300 watts or less shall be permitted with lampholders of the medium-base, unswitched porcelain type or other types identified as suitable for use with infrared heating lamps rated 300 watts or less. (b) Over 300 Watts. Screw-shell lampholders shall not be used with infrared lamps over 300 watts rating. Exception: Lampholders identified as suitable for use with infrared heating lamps rated more than 300 watts. (c) Lampholders. Lampholders shall be permitted to be connected to any of the branch circuits of Article 210 and, in industrial occupancies, shall be permitted to be operated in series on circuits of over 150 volts to ground provided the voltage rating of the lampholders is not less than the circuit voltage. Each section, panel, or strip carrying a number of infrared lampholders (including the internal wiring of such section, panel, or strip) shall be considered an appliance. The terminal connection block of each such assembly shall be considered an individual outlet. 422-16. Grounding. Appliances required by Article 250 to be grounded shall have exposed noncurrent-carrying metal parts grounded in the manner specified in Article 250. (FPN): See Sections 250-42, 250-43, and 250-45 for equipment grounding of refrigerators and freezers and Sections 250-57 and 250-60 for equipment grounding of electric ranges, wall-mounted ovens, counter-mounted cooking units, and clothes dryers. 422-17. Wall-Mounted Ovens and Counter-Mounted Cooking Units. (a) Permitted to Be Cord- and Plug-Connected or Permanently Connected. Wall-mounted ovens and counter-mounted cooking units complete with provisions for mounting and for making electrical connections shall be permitted to be permanently connected or, only for ease in servicing or for installation, cord-and plug-connected. (b) Separable Connector or a Plug and Receptacle Combination. A separable connector or a plug and receptacle combination in the supply line to an oven or cooking unit shall: (1) Not be installed as the disconnecting means required by Section 422-20. (2) Be approved for the temperature of the space in which it is located. 422-18. Support of Ceiling Fans. Listed ceiling fans that do not exceed 35 pounds (15.88 kg) in weight, with or without accessories, shall be permitted to be supported by outlet boxes identified for such use and supported in accordance with Sections 370-23 and 370-27. 70-356 NATIONAL ELECTRICAL CODE 422-19. Other Installation Methods. Appliances employing methods of installation other than covered by this article shall be permitted to be used only by special permission. D. Control and Protection of Appliances 422-20. Disconnecting Means. A means shall be provided to disconnect each appliance from all ungrounded conductors in accordance with the following sections of Part D. If an appliance is supplied by more than one source, the disconnecting means shall be grouped and identified. 422-21. Disconnection of Permanently Connected Appliances. (a) Rated at Not Over 300 Volt Amperes or 1/8 Horsepower. For permanently connected appliances rated at not over 300 volt amperes or 1/8 horsepower, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means. (b) Permanently Connected Appliances of Greater Rating. For permanently connected appliances of greater rating, the branch-circuit switch or circuit breaker shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is capable of being locked in the open position. (FPN No. 1): For motor-driven appliances of more than 1/8 horsepower, see