Chapter 3.
Wiring Methods and Materials

ARTICLE 300 – GENERAL REQUIREMENTS FOR WIRING METHODS AND MATERIALS

300.3(C) Revise this section as follows:

300.3(C)   Conductors of Different Systems.

   (1)   1000 Volts, Nominal or Less. Conductors of ac and dc circuits, [ ← ] from separately derived systems, from separate services, or from separate utility meters shall not be permitted to occupy the same equipment wiring enclosure, cable or raceway with conductors from other systems, services, or meters. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure, cable, or raceway.

   Secondary wiring to electric-discharge lamps of 1000 volts or less, if insulated for the secondary voltage involved, shall be permitted to occupy the same luminaire, sign, or outline lighting enclosure as the branch-circuit conductors.

   Informational Note No. 1: See 725.136(A) for Class 2 and 3 circuit conductors.

   Informational Note No. 2: See 690.4(B) for photovoltaic source and output circuits.

   Exception No 1: Photovoltaic Systems: PV Source Circuits and PV Output Circuits in accordance with Section 690.31(B) Identification and Grouping.

   Exception No. 2: Emergency Systems: Conductors installed in accordance with Section 700.10 Wiring.

   Exception No. 3: Remote-Control, Signaling, and Power-Limited Circuits: Class 1, 2 or 3 Conductors installed in accordance with Article 725.136(A) General.

   Exception No. 4: Auxiliary Gutters: When approved by the AHJ Conductors connected to Separately Derived Systems, Service Equipment, or Meter Banks Article 366.

300.4(I) Add the following section:

   (I)   Subject to Physical Damage. Premises wiring systems installed less than 2.44 m (8 feet) above a walking surface or finished floor are considered subject to physical damage.

300.37 Revise this section as follows:

300.37 Aboveground Wiring Methods. Aboveground conductors, 12KV or larger, in Residential or Commercial Occupancies, shall be installed in Rigid Steel Conduit.

   Aboveground conductors less than 12 KV, in other than Residential or Commercial Occupancies, shall be installed in rigid metal conduit, in intermediate metal conduit, in electrical metallic tubing, in RTRC and PVC conduit, in cable trays, in auxiliary gutters, as busways, as cablebus, in other identified raceways, or as exposed runs of metal-clad cable suitable for the use and purpose. In locations accessible to qualified persons only, exposed runs of Type MV cables, bare conductors, and bare busbars shall also be permitted. Busbars shall be permitted to be either copper or aluminum.

ARTICLE 320 – ARMORED CABLE: TYPE AC

320.108 Revise this section as follows:

320.108 Equipment Grounding Conductor. Type AC cable shall provide an adequate path for fault current as required by 250.4(A)(5) or (B)(4) to act as an equipment grounding conductor. An equipment grounding conductor, sized as required by Table 250.122, shall be provided within the cable assembly.