424.35 Marking of Heating Cables.
Each unit shall be marked with the identifying name or identification symbol, catalog number, and ratings in volts and watts or in volts and amperes.
Each unit length of heating cable shall have a permanent legible marking on each nonheating lead located within 75 mm (3 in.) of the terminal end. The lead wire shall have the following color identification to indicate the circuit voltage on which it is to be used:
(1) 120 volt, nominal — yellow
(2) 208 volt, nominal — blue
(3) 240 volt, nominal — red
(4) 277 volt, nominal — brown
(5) 480 volt, nominal — orange
Color code
Branch circuits, 210.4(D), 210.5
Conductors, 310.12, 504.80(C),
647.4(C)
Grounded conductor, 200.6
Grounding conductor, 250.119,
310.12(B), 400.23
Heating cables, 424.35
Higher voltage to ground
Feeders, 215.8
Panel boards, 408.3(E)
Sensitive electronic equip-ment,
647.4(C)
Service-entrance conductors,
230.56
