Mains RCD tripping on larger MCB's

[Linksy5]

Hello
Looking for advise please.
Our mains RCD switch 60A 30mA MK LN 5760 is tripping when either one of my larger mcbs is turned on.
- 32A shower
- 30A sockets
- 30A cooker
I turned every breaker off and individually turned them on. All three mentioned above individually trip the mains RCD.

 

[buzzlightyear]

http://www.ebay.co.uk/itm/MK-LN5760...667289?hash=item25da901b99:g:q7sAAOSw~rpZXktk
found on flybay.

 

[SparkyChick]

An earth leakage clamp meter might be handy as well.

Good luck, hope you get it sorted.

 

[Linksy5]

Initially I would be considering an RCD trip test and thereafter, if that was OK, an insulation resistance test individually on each circuit.
Any electrician attending a job should have a tester to do these tests.

Sorry should have mentioned the relative in the industrial trade would probably have to borrow any test equipment needed.
Thank you for your help

 

[Linksy5]

Initially I would be considering an RCD trip test and thereafter, if that was OK, an insulation resistance test individually on each circuit.
Any electrician attending a job should have a tester to do these tests.

Sorry should have mentioned the relative in the industrial trade would probably have to borrow any test equipment needed.
Thank you for your help

 

[Linksy5]

An earth leakage clamp meter might be handy as well.

Good luck, hope you get it sorted.

Thank you, really appreciate all he advise

 

[Des 56]

Your relative should be able to open the consumer unit,disconnect all the circuit neutrals,check the resetting of the Rcd
If it now resets,the neutral conductors can be replaced one at a time to see if balance is maintained
If he is an electrician (of whatever discipline)and have test meters,the problem should be easy to identify

 

[Linksy5]

Your relative should be able to open the consumer unit,disconnect all the circuit neutrals,check the resetting of the Rcd
If it now resets,the neutral conductors can be replaced one at a time to see if balance is maintained
If he is an electrician (of whatever discipline)and have test meters,the problem should be easy to identify

Brilliant, thank you very much

 

[Pete999]

Really appreciate the response I've received from this, great group.
I'll try the advise given to see if we can individually identify something.
My relative is a electrician but unfortunately in the industrial trade.
I reckon they would be willing to have a look at it for me, is there any type of tester I could advise them bring along with them.
Failing that, looks like I will be contacting a local sparky as mentioned I've noticed the RCD not easy to get a like for like now.
Thank you

If the relative you speak of is an Electrician, he/she must be able to sort this fault out for you, after all he.she is an Electrician

 

[Toneyz]

View attachment 37239

View attachment 37240

This is why a 30mA RCD should not be used as a main switch

 

[Linksy5]

Sorted, neutral completely melted going into our shower pull cord.
Been disconnected for now until we get a new one so at least we have electricity everywhere else now.
Thank you again

 

[SparkyChick]

Sounds like that started out as a loose connection

Thanks for letting us know the outcome and glad you've got your power back

 

[telectrix]

always the Neutral, always with the Negative waves.

 

[SparkyChick]

I think PWB Electronics (Snake oil?........... - http://www.electriciansforums.co.uk/threads/snake-oil.121810/page-2#post-1282013) are missing a trick. If their cable ties can improve audio by being wrapped round a plug, you'd have thought they'd have created one to stop loose connections causing a problem