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simon-0116

Wylex rcd button not working

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simon-0116

Wylex split load board, installed 2 weeks ago

Field called me on a Sunday afternoon saying 1 side tripped and now he's resett it but test button dosn't work.  

So I grab a spare rcd a few tools the wife and kids as they very mad about helping a good friend.

Test rcd button and times. Button dosn't work and 1x above 310ms.

So swap rcd to another and same results.

When you plug something in on socket circuit it trips rcd now,  he says wasn't before.

Insulation at 250v live neutral + e above 200

My wife going mental so agree with mate I'll go back on Monday 

 

Coincidence both rcd faulty or am I missing something.

Am I been thick over looking something simple

 

 

Edited by simon-0116

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Andy™

neutral in the wrong bar or N-E fault

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Murdoch

I would suggest you disconnect ALL the neutrals from the relevant neutral bars, turn off all the MCB's, and test the RCD properly with your MFT

 

IME RCD's rarely fail in service, especially  after such a short period of time

 

N-E fault likely

 

PS - RCBO boards are far better...

Edited by Murdoch

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binky

check PSCC/ PFC - look for faulty incoming neutral, anything weird is usually a neutral! 

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Murdoch
23 hours ago, binky said:

check PSCC/ PFC - look for faulty incoming neutral, anything weird is usually a neutral! 

 

Like that.

 

Reminds me of a fault a couple of years ago a customer was experiencing their rcds tripping ... often together. There was a plug below the board so I plugged my MFT in and looked at the voltages L - N and L - E ..... the L -N was fluctuating ....

 

so I called the dno ... at 7pm they turned up, at 3 am a temporary generator was installed and the next day they dug up the neighbours patio .... to repair the damaged incoming supply

 

Issues like this make the job so very interesting

 

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binky
19 minutes ago, Murdoch said:

 

Issues like this make the job so very interesting

 

 

confused the lettuced out of me the first time I encountered a DNO neutral fault...

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