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

For purposes of this section, primary protectors located at 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 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. 70-796 NATIONAL ELECTRICAL CODE (FPN): Selecting a primary protector location to achieve the shortest practicable primary protector grounding conductor will help limit potential differences between communications circuits and other metallic systems. (c) Hazardous (Classified) Locations. The primary protector shall not be located in any hazardous (classified) location as defined in Article 500, nor in the vicinity of easily ignitible material. Exception: As permitted in Sections 501-14, 502-14, and 503-12. 800-31. Primary Protector Requirements. The primary protector shall consist of an arrester connected between each line conductor and ground in an appropriate mounting. Primary protector terminals shall be marked to indicate line and ground as applicable. (FPN): One way to determine applicable requirements for a listed primary protector is to refer to the Standard for Protectors for Communications Circuits, ANSI/UL 497-1978. 800-32. Secondary Protector Requirements. Where a secondary protector is installed in series with the indoor communications wire and cable between the primary protector and the equipment, it shall be listed for the purpose. The secondary protector shall provide means to safely limit currents to less than the current-carrying capacity of listed indoor communications wire and cable, listed telephone set line cords, and listed communications terminal equipment having ports for external wire line communications circuits. Any overvoltage protection, arresters, or grounding connection shall be connected on the equipment terminals side of the secondary protector current-limiting means. (FPN No. 1): One way to determine applicable requirements for a listed secondary protector is to refer to the Standard for Secondary Protectors for Communications, UL497A-1990. (FPN No. 2): Secondary protectors on exposed circuits are not intended for use without primary protectors. 800-33. Cable Grounding. The metallic sheath of communications cables entering buildings shall be grounded as close as practicable to the point of entrance or shall be interrupted as close to the point of entrance as practicable by an insulating joint or equivalent device. For purposes of this section, the point of entrance shall be considered to be at the point of emergence through an exterior wall, a concrete floor slab, or from a rigid metal conduit or an intermediate metal conduit grounded to an electrode in accordance with Section 800-40(b). D. Grounding Methods 800-40. Cable and Primary Protector Grounding. The metallic member(s) of the cable sheath, where required to be grounded by Section 800-33, and primary protectors 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. ARTICLE 800 - COMMUNICATIONS CIRCUITS 70-797 (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. (4) Run in Straight Line. The grounding conductor shall be run to the grounding electrode in as straight a line as practicable. (5) Physical Damage. Where necessary, the grounding conductor shall be guarded from physical damage. 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 the grounding electrode of a building or structure disconnecting means that is grounded to an electrode as covered in Section 250-24. For purposes of this section, the mobile home service equipment or the mobile home disconnecting means, as described in Section 800-30(b), shall be considered accessible. (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