NONMETALLIC EXTENSIONS

70-237 318, 501, 502, and 504 in industrial establishments where the conditions of maintenance and supervision assure that only qualified persons will service the installation; (4) for Class 1 circuits as permitted in Article 725; (5) for nonpower-limited fire protective signaling circuits if conductors comply with the requirements of Section 760-16. (FPN): See Section 310-10 for temperature limitation of conductors. 340-5. Uses Not Permitted. Type TC tray cable shall not be (1) installed where they will be exposed to physical damage; (2) installed as open cable on brackets or cleats; (3) used where exposed to direct rays of the sun, unless identified as sunlight-resistant; (4) direct buried, unless identified for such use. 340-6. Marking. The cable shall be marked in accordance with Section 310-11. Cables that are flame-retardant and have limited-smoke characteristics shall be permitted to be identified with the suffix LS. 340-7. Ampacity. The ampacities of the conductors of Type TC tray cable shall be determined from Section 402-5 for conductors smaller than No. 14 and from Section 318-11. 340-8. Bends. Bends in Type TC cable shall be made so as not to damage the cable.