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K0CQ > TECHNI 16.01.05 10:42l 34 Lines 1178 Bytes #-7362 (0) @ WW
BID : 27300_W0AK
Read: GUEST OE7FMI
Subj: Re: Re^2: AC 3 Phase Power
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<ON0AR<ON0AR<F6KMO<EA5DVS<EA5AKC<
7M3TJZ<ON0BEL<W1NGL<WA7V<WH6IO<WB7AWL<KJ6EO<AE6JN<AE6JN<N0RVX<W0AK
Sent: 050115/1716Z @:W0AK.#CIA.IA.USA.NOAM #:27300 [Des Moines] $:27300_W0AK
From: K0CQ@W0AK.#CIA.IA.USA.NOAM
To : TECHNI@WW
US standard usage colors for 120 volts single phase are BLACK is
hot, WHITE is neutral, GREEN or BARE is ground. Red and blue are
used for other phases of three phase. Orange and yellow get used
at higher voltage than 120/208.
Now I've just checked the 1998 National Electrical Code. It does
NOT specify colors for most hot wires. Only for grounded neutrals
and for safety grounds. Grounded neutrals must be white, natural
gray, or white stripes on any color insulation but green. Safety
grounds must be green, bare, or green with a yellow stripe. The
only voltage carrying wire requiring a color is the wild leg of a
three phase circuit with ground at the mid of one side (delta
connected) where the phase conductor with the highest voltage to
ground is to be color coded orange by wire insulation or tape
color. With no other restrictions on color uses, I'd not like to
depend on orange being that wild leg.
The other major standards seem to come from the EC and I'm not
familiar with their requirements. Should I need them I can find
them.
73, Jerry, K0CQ @ W0AK.#CIA.IA.USA
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