The provisions of Article 503 of NFPA 70 are adopted by reference with the following modifications:
1. Revise subsections 503.10 (A)(1) to (A)(3) to read:
"(1) General. In Class III, Division 1 locations, the wiring method shall be in accordance with (1) through (4):
(1) Rigid metal conduit, Type RTRC conduit, intermediate metal conduit, electrical metallic tubing, dust- tight wireways, or Type MI cable with listed termination fittings.
(2) Type PLTC and Type PLTC-ER cable in accordance with the provisions of Article 725 including installation in cable tray systems. The cable shall be terminated with listed fittings.
(3) Type ITC and Type ITC-ER cable as permitted in 727.4 and terminated with listed fittings.
(2) Boxes and Fittings. All boxes and fittings shall be dust-tight.
(3) Flexible Connections. Where necessary to employ flexible connections, one or more of the following shall be permitted:
(1) Dust-tight flexible connectors
(2) Liquidtight flexible metal conduit with listed fittings,
(3) Interlocked armor Type MC cable having an overall jacket of suitable polymeric material and installed with listed dust-tight termination fittings
(4) Flexible cord in compliance with 503.140
Informational Note: See 503.30(B) for grounding requirements where flexible conduit is used.
(5) For elevator use, an identified elevator cable of Type EO, ETP, or ETT, shown under the "use" column in Table 400.4 for "hazardous (classified) locations" and terminated with listed dust-tight fittings."
2. Revise subsection 503.10(B) to read:
"Class III, Division 2. In Class III, Division 2 locations, the wiring method shall comply with 503.10(A)."