Wiring colour coding.

Discussion in 'General Electronics Chat' started by Armagguedes, Mar 28, 2007.

  1. Armagguedes

    Thread Starter Member

    Feb 17, 2007
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    0
    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
     
  2. Dave

    Retired Moderator

    Nov 17, 2003
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  3. thingmaker3

    Retired Moderator

    May 16, 2005
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  4. Armagguedes

    Thread Starter Member

    Feb 17, 2007
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    Why do they use blue for neutral and brown for live? Isn't blue a much more "livelier" colour?
     
  5. Gadget

    Distinguished Member

    Jan 10, 2006
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    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.
     
  6. Dave

    Retired Moderator

    Nov 17, 2003
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    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
     
  7. Armagguedes

    Thread Starter Member

    Feb 17, 2007
    21
    0
    According to:
    and

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

    Makes perfect sense. =)
     
  8. Dave

    Retired Moderator

    Nov 17, 2003
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    Whatever works for you! :D

    Dave
     
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