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RCD Not working with the test button

Johno12345

Hello all!

I have a circuit, 16a 3ph&e feeding a 16a socket and it has a stand-alone RCD after the isolator, before the socket - fairly normal I think.

The test button doesn't work on the RCD, its a 4 pole unit, nothing connected to the neutral, but looking at the little circuit diagram, it looks like the test button is connected between N and E

It does trip with a fault, but is this, a) normal, b) compliant?

Im not an electrician, just an enthusiastic amateur FM

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    it looks like the test button is connected between N and E

    That would be unusual I think (not to mention unreliable, as the N-PE voltage tends to be somewhat variable) - normally the test button (and appropriate resistor for 230V) is connected between one of the lines and N on the opposite side. If no N is present the N terminal can then be connected to either one of the other two lines via an additional external resistor (making the overall suitable for 400V).

    I'd maybe check the RCD has actually been connected as the manufacturer intended...

       - Andy.

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  • 0

    it looks like the test button is connected between N and E

    That would be unusual I think (not to mention unreliable, as the N-PE voltage tends to be somewhat variable) - normally the test button (and appropriate resistor for 230V) is connected between one of the lines and N on the opposite side. If no N is present the N terminal can then be connected to either one of the other two lines via an additional external resistor (making the overall suitable for 400V).

    I'd maybe check the RCD has actually been connected as the manufacturer intended...

       - Andy.

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