:: Help, NEC wire color code
scooter
standard..
thanks
scooter
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Alan 'A.J.' Franzman
news:noemail-65DD21...@nic-31-c3-17.mn.mediaone.net...
> Where can I find a list of color code for wires that is under an NEC
> standard..
Here's a brief summary:
grounding conductors must be green or bare
neutral ("grounded") conductors must be white or "natural gray"
ungrounded circuit conductors ("hot") may be any color BUT green,
white, or "natural gray"
on systems in which the midpoint of one phase of a delta-configured
source is grounded, the conductors of the phase at the highest
potential to ground must be orange - note that this does not preclude
use of the color orange for use in systems with other configurations
Typically, in residential wiring, the ungrounded conductors are black
and red for the 2 sides of the single phase. Even though the power is
single-phase, the circuitry is often referred to as "phase 'A'" and
"phase 'B'" because both ends are at 120 volts to ground since the
midpoint of the phase is grounded.
In commercial and industrial 3-phase systems, the usual colors are
black-A, red-B, and blue-C for 120Y208 volts; and brown-A, orange-B,
yellow-C for 277Y480 volts. I've never had the pleasure to work on a
120/240(delta)208 system, so I can't tell you what colors would
typically be used for the 120 volts-to-ground phases. I've been
taught that it's usually the 'B' phase that is at 208 volts to ground
so those wires must be orange. Phases A & C could be black & red,
black & blue, brown & yellow, or just about anything else...
HTH
«
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Alan "A.J." Franzman
Email: a.j.franzman at verizon dot net
--------------------
Stephen Shaw
> "scooter" <noe...@noemail.cc> wrote in message
> news:noemail-65DD21...@nic-31-c3-17.mn.mediaone.net...
>> Where can I find a list of color code for wires that is under an NEC
>> standard..
>
> http://www.nfpa.org/nec/
>
> Here's a brief summary:
>
> grounding conductors must be green or bare
>
> neutral ("grounded") conductors must be white or "natural gray"
Funny about the differences here in South Africa we have to conform to SABS
0142
(South African Bureau of Standards). Neutral must be BLACK, "hot" conductors
are normally red but can be other colours to identify the circuit they feed. 3
phases are coded red, white and blue. Voltage here is 230V 50Hz +/-6%. 3 phase
is 400V but can swing between 380 and 415.
>
> ungrounded circuit conductors ("hot") may be any color BUT green,
> white, or "natural gray"
>
> on systems in which the midpoint of one phase of a delta-configured
> source is grounded, the conductors of the phase at the highest
> potential to ground must be orange - note that this does not preclude
> use of the color orange for use in systems with other configurations
>
> Typically, in residential wiring, the ungrounded conductors are black
> and red for the 2 sides of the single phase. Even though the power is
> single-phase, the circuitry is often referred to as "phase 'A'" and
> "phase 'B'" because both ends are at 120 volts to ground since the
> midpoint of the phase is grounded.
>
> In commercial and industrial 3-phase systems, the usual colors are
> black-A, red-B, and blue-C for 120Y208 volts; and brown-A, orange-B,
> yellow-C for 277Y480 volts. I've never had the pleasure to work on a
> 120/240(delta)208 system, so I can't tell you what colors would
> typically be used for the 120 volts-to-ground phases. I've been
> taught that it's usually the 'B' phase that is at 208 volts to ground
> so those wires must be orange. Phases A & C could be black & red,
> black & blue, brown & yellow, or just about anything else...
>
> HTH
>
> «
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