(I normally use same color blue for COM, +, and all 24VDC signal wires)īlue w/ white stripe = Usually 24VDC COM, but I've also seen it used as 24VDC+ It is still live since powered externally. Think of this as wiring into a relay in your local panel that switches the contacts off when that panel drops out and sending that signal back to the other panel. Purple, Yellow, Orange or these colors with a red stripe = Usually 120V control voltage that is for interlock circuits from other panels that are externally powered (from a different cabinet) and will still be live when you switch off power on the local control cabinet. Green or Green with Yellow Stripe = Ground Normally I use all black wires for three phase. Just adding in to what I have seen in the USA, and what should normally be used.īlack = Circuits with voltages higher than 120V (up to 480V three phase). GREEN or GREEN/YELLOW, this wire is nearly always safe to touch, its colour indicates it is connected directly to ground, and should have no nasty surprises on it, but it might have got disconnected, so check it out with your meter anyway. RED-DANGER, this wired could be HOT at times, not always though, so check it out with your meter.īLACK-SAFE, this wire is most often not dangerous, usually connected directly, or indirectly to ground, but could have become disconnected, so check it out with your meter anyway.
Possibly the best "standard" that could be adopted is. I'm beginning the think a much better "standard" would be to use one colour throughout, and use cable idents from the schematics, which incidentally, never showed cable colours !! Now it's BROWN-HOT (A bit "earthy"), BLUE-NEUTRAL (because blue is a "vibrant" colour), and GREEN/YELLOW STRIPED for EARTH (isn't earth coloured brown, it is in my garden).
Here in the UK, for domestic single-phase wiring, it used to be RED-HOT, BLACK-COLD, the "earth" connection is uncovered, but we used piping GREEN-GRASSY EARTH.
I guess that's the biggest problem with "standards" - everyone wants theirs to be THE standard !! As far as I know, this is only within their distribution network, and once it reaches customer supply it is normal Red Black Blue White Green colours. Just to make things more fun, here in BC at least not sure about other provinces, the local supply authority (BC Hydro) uses Brown as L1, and forbids the use of black wires anywhere.
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