Wiring colour coding.

Thread Starter

Armagguedes

Joined Feb 17, 2007
21
Hello.

I would like someone to clearly lay out to me what colours match what phase (?) according to the standards out there. I know that colours are just a convention, and that as long as keep the colours coherent across a circuit it is really Ok, but i'd like to know about the standards.

Tipically i use BLACK for NEUTRAL (or COMMON or NEGATIVE or whatever you want to call it) and RED for LIVE (or POSITIVE). I have seen also BROWN for LIVE and BLUE for COMMON. GREEN or GREEN&YELLOW is always earthing.

The problem is that i have spotted on occasion mixtures, like black and blue, red and blue or black and brown. I have seen other colours mixed as well, but those (white, yellow, violet, etc) were in complex circuits, like a PBX.

Thanks;
Bruno
 

Dave

Joined Nov 17, 2003
6,970

Gadget

Joined Jan 10, 2006
614
No Idea. Here in NZ and also Australia, the convention is similar to UK and europe.
For permanent/fixed wiring (behind the walls)
Red is Phase,
Black is Neutral and
green is earth...

For non fixed wiring (appliances and extensions)
Brown is phase
Blue is Neutral and
Green/Yellow is earth.

Is suspect we all did it that way just to frustrate the US.
 

Dave

Joined Nov 17, 2003
6,970
Why do they use blue for neutral and brown for live? Isn't blue a much more "livelier" colour?
By analogy:

Water is blue and neutral (on the pH scale).

Trees (at least the bark) is brown and live/living.

This is probably not the reasons why they are selected as such, but is the way I remember.

Dave
 

Thread Starter

Armagguedes

Joined Feb 17, 2007
21
According to:
No Idea. Here in NZ and also Australia, the convention is similar to UK and europe.
For permanent/fixed wiring (behind the walls)
Red is Phase,
Black is Neutral and
green is earth...

For non fixed wiring (appliances and extensions)
Brown is phase
Blue is Neutral and
Green/Yellow is earth.

(...)
and

By analogy:

Water is blue and neutral (on the pH scale).

Trees (at least the bark) is brown and live/living.

(...)

Dave
you get:
Red is for bleeding children.
Black is for incinerated children.​

Makes perfect sense. =)
 
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