Exception: Type PVC conduit, Type RTRC conduit, and Type HDPE conduit shall be permitted where encased in a concrete envelope a minimum of 50 mm (2 in.) thick and provided with not less than 600 mm (24 in.) of cover measured from the top of the conduit to grade. The concrete encasement shall be permitted to be omitted where subject to the provisions of 514.8, Exception No. 2, or 515.8(A). Threaded rigid metal conduit or threaded steel intermediate metal conduit shall be used for the last 600 mm (24 in.) of the underground run to emergence or to the point of connection to the aboveground raceway. An equipment grounding conductor shall be included to provide for electrical continuity of the raceway system and for grounding of non-current-carrying metal parts.

(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."

(Amend Coun. J. 10-7-20, p. 21791, Art. III, § 4)

14E-5-502 Class II locations.

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."

14E-5-503 Class III locations.

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)."

14E-5-504 Intrinsically safe systems.

The provisions of Article 504 of NFPA 70 are adopted by reference without modification.

14E-5-505 Zone 0, 1, and 2 locations.

The provisions of Article 505 of NFPA 70 are adopted by reference without modification.

14E-5-506 Zone 20, 21, and 22 locations for combustible dusts or ignitable fibers/flyings,

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).