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The provisions of Article 501 of NFPA 70 are adopted by reference with the following modifications:
1. Revise subsections 501.10(A)(1) and (A)(2) to read:
“(1) General. In Class I, Division 1 locations, the wiring methods in (a) through (c) shall be permitted.
(a) Threaded rigid metal conduit or threaded steel intermediate metal conduit.
(b) Type MI cable terminated with fittings listed for the location. Type MI cable shall be installed and supported in a manner to avoid tensile stress at the termination fittings.
(c) Optical fiber cable Types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN and OFC shall be permitted to be installed in raceways in accordance with 501.10(A). These optical fiber cables shall be sealed in accordance with 501.15.
(2) Flexible Connections. Where necessary to employ flexible connections, as at motor terminals, one of the following shall be permitted:
(1) Flexible fittings listed for the locations
(2) Flexible cord in accordance with the provisions of 501.140, terminated with cord connectors listed for the location.”
2. Revise subsections 501.10(B)(1) and (B)(2) to read:
“(1) General. In Class I, Division 2 locations, the following wiring methods shall be permitted:
(1) All wiring methods permitted in 501.10(A).
(2) Enclosed gasketed busways and enclosed gasketed wireways.
(3) Type PLTC and Type PLTC-ER cable in accordance with the provisions of Article 725. The cable shall be terminated with listed fittings.
(4) Type MV and the cable shall be terminated with listed fittings.
(5) Optical fiber cable Types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permitted to be installed in any raceway in accordance with 501.10(B). Optical fiber cables shall be sealed in accordance with 501.15.
(2) Flexible Connections. Where provision must be made for limited flexibility, one or more of the following shall be permitted:
(1) Listed flexible metal fittings.
(2) Flexible metal conduit with listed fittings.
(3) Liquidtight flexible metal conduit with listed fittings.
(4) Flexible cord listed for extra-hard usage and terminated with listed fittings. A conductor for use as an equipment grounding conductor shall be included in the flexible cord.
(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 fittings.
Informational Note: See 501.30(B) for grounding requirements where flexible conduit is used.”
(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)
The provisions of Article 502 of NFPA 70 are adopted by reference with the following modifications:
1. Revise subsections 502.10(A)(1) and (A)(2) to read:
“(1) General. In Class II, Division 1 locations, the wiring methods in (1) through (4) shall be permitted:
(1) Threaded rigid metal conduit, or threaded steel intermediate metal conduit.
(2) Type MI cable with termination fittings listed for the location. Type MI cable shall be installed and supported in a manner to avoid tensile stress at the termination fittings.
(3) Optical fiber cable Types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permitted to be installed in raceways in accordance with 502.10(A). Optical fiber cables shall be sealed in accordance with 502.15.
(2) Flexible Connections. Where necessary to employ flexible connections, one or more of the following shall also 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 provided with termination fittings listed for Class II, Division 1 locations.
(4) Flexible cord listed for extra-hard usage and terminated with listed dust-tight fittings. Where flexible cords are used, they shall comply with 502.140.
Informational Note: See 502.30(B) for grounding requirements where flexible conduit is used.”
2. Revise subsections 502.10(B)(1) and (B)(2) to read:
“(1) General. In Class II, Division 2 locations, the following wiring methods shall be permitted:
(1) All wiring methods permitted in 502.10(A).
(2) Rigid metal conduit, intermediate metal conduit, electrical metallic tubing, dust-tight wireways.
(3) Type MI cable with listed termination fittings.
(4) 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.
(5) Type ITC and Type ITC-ER cable as permitted in 727.4 and terminated with listed fittings.
(6) Type MI, MV, TC, or TC-ER cable installed in ladder, ventilated trough, or ventilated channel cable trays in a single layer, with a space not less than the larger cable diameter between the two adjacent cables, shall be the wiring method employed.
(7) Optical fiber cable Types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permitted to be installed in cable trays or any other raceways in accordance with 502.10(A). Optical fiber cables shall be sealed in accordance with 502.15
(2) Flexible Connections. Where provision must be made for flexibility, 502.10(A)(2) shall apply.”
(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)
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).”
(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)
The provisions of Article 506 of NFPA 70 are adopted by reference with the following modifications.
1. Revise subsection 506.15(A) by deleting items (3) and (4).
2. Revise subsection 506.15(C) item (3) to read:
“Type MI cable with listed termination fittings.”
3. Revise subsection 506.15(C) by deleting items (4), (5), and (6).
(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)
The provisions of Article 511 of NFPA 70 are adopted by reference with the following modifications:
1. Revise subsection 511.7(A)(1) to read:
“Fixed Wiring Above Class I Locations. All fixed wiring above Class I locations shall be in metal raceways, flexible metal conduit, liquidtight flexible metal conduit, or shall be Type MI, or PLTC cable in accordance with Article 725, or Type TC cable or Type ITC cable in accordance with Article 727.”
2. Revise section 511.8 to read:
“Underground Wiring. Underground wiring shall be installed in threaded rigid metal conduit or threaded intermediate metal conduit.”
(Added Coun. J. 9-6-17, p. 55278, Art. I, § 1)
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