in  the US - single phase house wiring - black is hot, white is neutral 
and green is ground (or bare).

On 7/14/2011 1:24 PM, andy pugh wrote:
> On 14 July 2011 19:10, Peter Blodow<p.blo...@dreki.de>  wrote:
>
>> at least since I was a little boy (half a century ago), black used to be
>> the colour of the live wire in ordinary cables here in Europe.
> Curious.
>
> As long as I have been aware of it (probably 35 years since I first
> wired a plug) it was red for live and black for neutral in fixed
> wiring, and brown for live and blue for neutral in flex. (I presume
> that before I noticed they were both red/black). We recently switched
> fixed-wiring to brown/blue (which I thought was euro-harmonisation
> too).
> At the same time 3-phase went from red/blue/yellow with a black
> neutral to brown/black/grey with a blue neutral.
> So now blue and black can both be live or neutral.
>

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