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Phase Identification #80093 02/26/02 11:34 AM
Joined: Feb 2002
Posts: 3
P
Paul@RBEC Offline OP
Junior Member
Is there a defined standard for the identification of Phases in a service, feeders and branch circuits? We have use BLUE, RED, YELLOW tape in the past for feeders but I noticed a Master Electrician carrying an index card in his wallet with various color standards for different applications. Is there a code reference on this? or just secrets of the trade?

2017 / 2014 NEC & Related Books and Study Guides
Re: Phase Identification #80094 02/26/02 12:28 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
There is no standard that I know of. Here's what seems to be popular

Black, red 120/240 single phase
black, orange & blue 120/240 3 phase
black, red, blue 120/208 3 phase
brown, orange, yellow 480 volt 3 phase


Few things are harder to put up with than the annoyance of a good example.
Re: Phase Identification #80095 02/27/02 12:50 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
Member
Ditto, Tom.
Remember the Orange goes on the high leg of the 240 volt 3phase 4wire delta.

Re: Phase Identification #80096 02/27/02 02:06 PM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline
Member
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


Joe Tedesco, NEC Consultant

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