for cables permitted in cable trays.

(D) Hazardous (Classified) Locations. Cables installed in hazardous locations shall be as described in

725.154(D)(1) through (D)(4).

(1) Type PLTC. Cables installed in hazardous (classified)

locations shall be Type PLTC. Where the use of Type PLTC cable is permitted by 501.10(B), 502.10(B), and 504.20, the cable shall be installed in cable trays, in raceways, supported by messenger wire, or otherwise adequately supported and mechanically protected by angles, struts, channels, or other mechanical means. The cable shall be permitted to be directly buried where the cable is listed for this use.

(2) Intrinsically Safe Circuits and Nonincendive Field

Wiring. Wiring for nonincendive circuits as permitted by

501.10(B)(3), and wiring for intrinsically safe circuits as
permitted by 504.20, shall be permitted for circuits
derived from Class 2 sources.

(3) Thermocouple Circuits. Conductors in Type PLTC cables used for Class 2 thermocouple circuits shall be permitted to be any of the materials used for thermocouple extension wire.

(4) In Industrial Establishments. In industrial establish- ments where the conditions of maintenance and supervision ensure that only qualified persons service the installation, Type PLTC cable shall be permitted in accordance with either (1) or (2):

(1) Type PLTC cable, with a metallic sheath or armor in accordance with 725.179(E), shall be permitted to be installed exposed. The cable shall be continuously sup- ported and protected against physical damage using mechanical protection such as dedicated struts, angles, or channels. The cable shall be secured at intervals not exceeding 1.8 m (6 ft). (2) Type PLTC cable, without a metallic sheath or armor, that complies with the crush and impact requirements of Type MC cable and identified for such use with the marking PLTC-ER, shall be permitted to be installed exposed. The cable shall be continuously supported and protected against physical damage using mechanical protection such as dedicated struts, angles, or channels. The cable shall be secured at intervals not exceeding 1.8 m (6 ft).

(E) Other Wiring Within Buildings. Cables installed in building locations other than those covered in

725.154(A) through (D) shall be as described in any of
(E)(1) through (E)(7).

(1) General. Type CL2 or CL3 shall be permitted.

(2) In Raceways or Other Wiring Methods. Type CL2X or CL3X shall be permitted to be installed in a raceway or in accordance with other wiring methods covered in Chapter 3.

(3) Nonconcealed Spaces. Type CL2X and Type CL3X cables shall be permitted to be installed in nonconcealed spaces where the exposed length of cable does not exceed 3 m (10 ft).

(4) One- and Two-Family Dwellings. Type CL2X cables less than 6 mm (0.25 in.) in diameter and Type CL3X cables less than 6 mm (0.25 in.) in diameter shall be permitted to be installed in one- and two-family

dwellings.

(5) Multifamily Dwellings. Type CL2X cables less than 6 mm (0.25 in.) in diameter and Type CL3X cables less than 6 mm (0.25 in.) in diameter shall be permitted to be installed in nonconcealed spaces in multifamily dwellings.

(6) Under Carpets. Type CMUC undercarpet communications wires and cables shall be