501 – Class I Locations

501.10(A)(1) – Type TC-ER-HL cable and Type P Cable

Change at a Glance:

Type TC-ER-HL cable and Type P cable were added as two new wiring methods for Class I, Division 1 locations.

501.10 Wiring Methods. (Class I Locations) Wiring methods shall comply with 501.10(A) or (B).

(A) Class I, Division 1.
(1) General. In Class I, Division 1 locations, the following wiring methods in (a) through (f) shall be permitted:
(a) Threaded rigid metal conduit (Type RMC) or threaded steel intermediate metal conduit (Type IMC). (see NEC for complete details)
(b) Type MI cable (see NEC for complete details)
(c) Type MC-HL cable (see NEC for complete details)
(d) Type ITC-HL cable (see NEC for complete details)
(e) Optical fiber cable Types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC (see NEC for complete details)
(f) In industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation, for applications limited to 600 volts nominal or less, and where the cable is not subject to physical damage, and terminated with fittings listed for the location, Type TC-ER-HL cable. Type TC-ER-HL cable shall be listed for use in Class I, Division 1 or Zone 1 locations and shall be installed in accordance with 336.10.
Informational Note: See the information on construction, testing, and marking of cables and cable fittings in ANSI/UL 2225-2013, Cables and Cable- Fittings for Use in Hazardous (Classified) Locations.
(g) In industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation, listed Type P cable with metal braid armor, with an overall jacket, terminated with fittings listed for the location, and installed in accordance 337.10.
Informational Note No. 1: For information on construction, testing, and marking of Type P cable, see ANSI/UL 1309-2017, Marine Shipboard Cable.
Informational Note No. 2: For information on construction, testing, and marking of cable fittings, see ANSI/UL 2225-2013, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations.