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Three Phase RCD


andyjw

Question

Has anyone seen a Triple Pole RCD?

All I can get are 4 pole, and the guys selling me them cant tell me if they will work on a three phase / three wire system!!

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8 answers to this question

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Andy™

a TPN RCD will work on TP. dont think ive ever seen a 3 pole RCD either

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Andy™
Andy and Sandy it would seem............

:D

and whats your 'andy' name patch?

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I know Ive use a 4 pole on three wire, but I cant remember how I got the test button to operate. Im sure I had to put a resistor in across one of the phases and the neutral way of the RCD. Any ideas?

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Andy™

look at the test button diagram on the RCD - it may be connected between 2 phases. if it is connected to neutral, it will need a resistor between a phase and 'neutral'. value will depend on the resistance of the test button circuit

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Nice to hear someone else thinks like me :)

I finally managed to get a coherent response from Dorman Smith, they even sent me a wiring diagram for their 4 pole RCCB.

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Andy™

is it the same diagram thats on the side or a more detailed one?

you'd think they would put the test circuit between 2 phases instead of phase and neutral, since a neutral is not always used in 3 phase. but then i suppose that makes sense, so best leave it as is...

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Evans Electric

Is this the " Andys" only thread or what?

Mandy

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Apache
Is this the " Andys" only thread or what?

Mandy

Andy and Sandy it would seem............

:D

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