rcd tripping on a ring main

[Daveh36]

Ok help before a pull out the rest of my hair got an rcd that trips when ring main breaker turned on got continuity but still trips when only live connected ant ideas

 

[westward10]

Think you need to expand on the situation and be a bit clearer.

 

[Daveh36]

ok so just changed a board connected everything back up and was tripping on lights or so I thought so disconnected them. no all I have connected in board is two lives for ring main and rcd trips when ever I turn the breaker on

 

[John Preston]

You say you only have 2 lives connected. No earth or neutrals connected?

 

[Daveh36]

yep disconnected everything trying to check whether a neutral was crossed or something literally pulling my hair out now

 

[Strima]

IR test results?

Continuity tests both end to end and figure of 8?

 

[buzzlightyear]

try neutral and earth fault .

 

[westward10]

As above what other tests have you carried out.

 

[buzzlightyear]

As above what other tests have you carried out

his hair .LoL.

 

[stevethesparks]

Might need to change your business name

 

[Daveh36]

ok so got continuity not shorts insulation resistance low but not too low at 16meg and again all I have connected or two lives of the ring no neutrals for any circuit no earths for any circuit. RCD stays on until I turn the breaker on. Never come across a fault like it

 

[Strima]

IR test done with all earths connected? Sounds like you have a path to earth somewhere.

If there's a boiler or other fixed appliance on the circuit check for reversed polarity.

 

[Pete999]

ok so got continuity not shorts insulation resistance low but not too low at 16meg and again all I have connected or two lives of the ring no neutrals for any circuit no earths for any circuit. RCD stays on until I turn the breaker on. Never come across a fault like it

With no Ns connected wont you have an imbalance in the circuit?

 

[westward10]

If this is a dual rcd board and I know this is obvious but are the neutrals definitely in the correct neutral bar.

 

[Deleted account]

A quick photo of board may help.

Do cables enter from back into wall or are they surface clipped.

 

[Pete999]

If this is a dual rcd board and I know this is obvious but are the neutrals definitely in the correct neutral bar.

For some reason the OP seems to be saying no Ns connected.

 

[littlespark]

Does the rcd stay on with no lives connected either?
Rule out a faulty rcd

 

[Pete999]

If this is a dual rcd board and I know this is obvious but are the neutrals definitely in the correct neutral bar.

For some reason the OP seems to be saying no Ns connected.

 

[Deleted account]

For some reason the OP seems to be saying no Ns connected.

I'm a bit confused myself on this one. Don't understand the situation.
Better explanations is needed I think.

 

[Midwest]

OP is saying he has only lives connected, energises mcb & then RCD trips. That 'lecky is going somewhere, and as already suggested there must be a parallel path to earth. Even 16 MΩ sounds like there's an issue somewhere, connected load or earth fault.