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

(FPN No. 2): For appliances employing unit switches, see Section 422-25. 422-22. Disconnection of Cord- and Plug-Connected Appliances. (a) Separable Connector or an Attachment Plug and Receptacle. For cord- and plug-connected appliances, an accessible separable connector or an accessible plug and receptacle shall be permitted to serve as the disconnecting means. Other cord- and plug-connected appliances shall be provided with disconnecting means in accordance with Section 422-21. (b) Connection at the Rear Base of a Range. For cord- and plugconnected household electric ranges, an attachment plug and receptacle connection at the rear base of a range, if it is accessible from the front by removal of a drawer, shall be considered as meeting the intent of Section 422-22(a). (c) Rating. The rating of a receptacle or of a separable connector shall not be less than the rating of any appliance connected thereto. Exception: Demand factors authorized elsewhere in this Code shall be permitted to be applied. (d) Requirements for Attachment Plugs and Connectors. Attachment plugs and connectors shall conform to the following: (1) Live Parts. They shall be so constructed and installed as to guard against inadvertent contact with live parts. (2) Interrupting Capacity. They shall be capable of interrupting their rated current without hazard to the operator. ARTICLE 422 - APPLIANCES 70-357 (3) Interchangeability. They shall be so designed that they will not fit into receptacles of lesser rating. 422-23. Polarity in Cord- and Plug-Connected Appliances. If the appliance is provided with a manually operated, line-connected, single-pole switch for appliance on-off operation, an Edison-base lampholder, or a 15- or 20-ampere receptacle, the attachment plug shall be of the polarized or grounding type. (FPN): For polarity of Edison-base lampholders, see Section 410-42(a). 422-24. Cord- and Plug-Connected Appliances Subject to Immersion. Cord- and plug-connected portable freestanding hydromassage units and hand-held hair dryers shall be constructed to provide protection for personnel against electrocution when immersed while in the "on" or "off" position. 422-25. Unit Switch(es) as Disconnecting Means. A unit switch(es) with a marked "off" position that is a part of an appliance and disconnects all ungrounded conductors shall be permitted as the disconnecting means required by this article where other means for disconnection are provided in the following types of occupancies: (a) Multifamily Dwellings. In multifamily dwellings, the other disconnecting means shall be within the dwelling unit, or on the same floor as the dwelling unit in which the appliance is installed, and shall be permitted to control lamps and other appliances. (b) Two-Family Dwellings. In two-family dwellings, the other disconnecting means shall be permitted either inside or outside of the dwelling unit in which the appliance is installed. In this case, an individual switch or circuit breaker for the dwelling unit shall be permitted and shall also be permitted to control lamps and other appliances. (c) One-Family Dwellings. In one-family dwellings, the service disconnecting means shall be permitted to be the other disconnecting means. (d) Other Occupancies. In other occupancies, the branch-circuit switch or circuit breaker, where readily accessible for servicing of the appliance, shall be permitted as the other disconnecting means. 422-26. Switch and Circuit Breaker to Be Indicating. Switches and circuit breakers used as disconnecting means shall be of the indicating type. 422-27. Disconnecting Means for Motor-Driven Appliances. If a switch or circuit breaker serves as the disconnecting means for a permanently connected motor-driven appliance of more than 1/8 horsepower, it shall be located within sight from the motor controller and shall comply with Part I of Article 430. Exception: A switch or circuit breaker that serves as the other disconnecting means as required in Section 422-25(a), (b), (c), or (d) shall be permitted to be out of sight from the motor controller of an appliance provided with a unit switch(es) with a marked "off" position and that disconnects all ungrounded conductors. 70-358 NATIONAL ELECTRICAL CODE 422-28. Overcurrent Protection. (a) Appliances. Appliances shall be protected against overcurrent in accordance with (b) through (f) below and Sections 422-4 and 422-5. Exception: Motors of motor-operated appliances shall be provided with overload protection in accordance with Part C of Article 430. Hermetic refrigerant motor-compressors in air-conditioning or refrigerating equipment shall be provided with overload protection in accordance with Part F I of Article 440. Where appliance overcurrent protective devices that are separate from the appliance are required, data for selection of these devices shall be marked on the appliance. The minimum marking shall be that specified in Sections 430-7 and 440-4. (b) Household-type Appliance with Surface Heating Elements. A household-type appliance with surface heating elements having a maximum demand of more than 60 amperes computed in accordance with Table 220-19 shall have its power supply subdivided into two or more circuits, each of which is provided with overcurrent protection rated at not over 50 amperes. (c) Infrared Lamp Commercial and Industrial Heating Appliances. Infrared lamp commercial and industrial heating appliances shall have overcurrent protection not exceeding 50 amperes. (d) Open-Coil or Exposed Sheathed-Coil Types of Surface Heating Elements in Commercial-type Heating Appliances. Open-coil or exposed sheathed-coil types of surface heating elements in commercial-type heating appliances shall be protected by overcurrent protective devices rated at not over 50 amperes. (e) Single Nonmotor-Operated Appliance. If the branch circuit supplies a single nonmotor-operated appliance, the rating of overcurrent protection shall (1) not exceed that marked on the appliance; (2) if the overcurrent protection rating is not marked and the appliance is rated over 13.3 amperes, not exceed 150 percent of the appliance rated current; or (3) if the overcurrent protection rating is not marked and the appliance is rated 13.3 amperes or less, not exceed 20 amperes. Exception: Where 150 percent of appliance rating does not correspond to a standard overcurrent device ampere rating, the next higher standard rating shall be permitted. (f) Electric Heating Appliances Employing Resistance-type Heating Elements Rated More than 48 Amperes. Electric heating appliances employing resistance-type heating elements rated more than 48 amperes shall have the heating elements subdivided. Each subdivided load shall not exceed 48 amperes and shall be protected at not more than 60 amperes. These supplementary overcurrent protective devices shall be (1) factoryinstalled within or on the heater enclosure or provided as a separate assembly by the heater manufacturer; (2) accessible, but need not be readily accessible; and (3) suitable for branch-circuit protection. The main conductors supplying these overcurrent protective devices shall be considered branch-circuit conductors. ARTICLE 422 - APPLIANCES 70-359 Exception No. 1: Household-type appliances with surface heating elements as covered in Section 422-28(b) and commercial-type heating appliances as covered in Section 422-28(d). Exception No. 2: Commercial kitchen and cooking appliances using sheathed-type heating elements not covered in Section 422-28(d) shall be permitted to be subdivided into circuits not exceeding 120 amperes and protected at not more than 150 amperes where one of the following is met: a. Elements are integral with and enclosed within a cooking surface; b. Elements are completely contained within an enclosure identified as suitable for this use; or c. Elements are contained within an ASME rated and stamped vessel. Exception No. 3: Water heaters and steam boilers employing resistance-type immersion electric heating elements contained in an ASME rated and stamped vessel shall be permitted to be subdivided into circuits not exceeding 120 amperes and protected at not more than 150 amperes. E. Marking of Appliances 422-29. Cord- and Plug-Connected Pipe Heating Assemblies. Cord- and plug-connected pipe heating assemblies intended to prevent freezing of piping shall be listed. 422-30. Nameplate. (a) Nameplate Marking. Each electric appliance shall be provided with a nameplate giving the identifying name and the rating in volts and amperes, or in volts and watts. If the appliance is to be used on a specific frequency or frequencies, it shall be so marked. Where motor overload protection external to the appliance is required, the appliance shall be so marked. (FPN): See Section 422-28(a), Exception for overcurrent protection requirements. (b) To Be Visible. Marking shall be located so as to be visible or easily accessible after installation. 422-31. Marking of Heating Elements. All heating elements that are rated over one ampere, replaceable in the field, and a part of an appliance shall be legibly marked with the ratings in volts and amperes, or in volts and watts, or with the manufacturer's part number. 422-32. Appliances Consisting of Motors and Other Loads. Appliances shall be marked in accordance with (a) or (b) below. (a) Marking. In addition to the marking required in Section 422-30, the marking on an appliance consisting of a motor with other load(s) or motors with or without other load(s) shall specify the minimum supply circuit conductor ampacity and the maximum rating of the circuit overcurrent protective device. 70-360 NATIONAL ELECTRICAL CODE Exception No. 1: Appliances factory-equipped with cords and attachment plugs, complying with Section 422-30. Exception No. 2: An appliance where both the minimum supply circuit conductor ampacity and maximum rating of the circuit overcurrent protective device are not more than 15 amperes and complies with Section 422-30. (b) Alternate Marking Method. An alternate marking method shall be permitted to specify the rating of the largest motor in volts and amperes, and the additional load(s) in volts and amperes, or volts and watts in addition to the marking required in Section 422-30. Exception No. 1: Appliances factory-equipped with cords and attachment plugs, complying with Section 422-30. Exception No. 2: The ampere rating of a motor ¹/₈ horsepower or less or a nonmotor load 1 ampere or less shall be permitted to be omitted unless such loads constitute the principal load.