[Gllug] OT: Mains electricity colour coding.

[Gerd Busker]

Chris Bell wrote:
> On Tue 26 Oct, t.clarke wrote:
>   
>> Hmm  - I always thought the ELCD/RCD tripped if the difference between current
>> on the 'live' wire and the current on the 'neutral' wire was more than a small
>> value???
>>
>> Tim
>>     
>
>    Correct, the neutral current goes in the reverse direction if it is
> single phase, but what about a 3-phase plus neutral installation? OK, you
> probably will be dead if you touch two phases, but lots of leakage of any
> kind can result in a fire.
>   
It's exactly the same with 3PH RCD's.  Sum of the current through the 
conductors has to be zero at any time unless there is a leak.  The 
mechanism to measure this is surprisingly simple.

Gerd
Gerd.
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