Lighting tripping rcd

[brucelee]

nicely located mate i bet your head was busting lol

 

[davelerave]

kinda obvious after

 

[andyemms]

I would be disconnecting some lights from the circuit and narrow down the fault that way... Has the RCD been tested?

 

[andyemms]

Damn, I wish I had read the other pages.... Doh!

Over and out!

 

[pushrod]

Having just read this thread - what testing would have put the OP on the right track more quickly?

Would continuity test at each lighting point between L and N, and then Insulation resistance tests between lighting N and all the other circuit neutrals have worked in showing the problem?

[Just trying to be prepared for when it happens to me ]

 

[davelerave]

Having just read this thread - what testing would have put the OP on the right track more quickly?

Would continuity test at each lighting point between L and N, and then Insulation resistance tests between lighting N and all the other circuit neutrals have worked in showing the problem?

[Just trying to be prepared for when it happens to me ]

isolate power ,turn off mcbs

disconnect circuit causing problem(L and N)

switch on borrowed load

check between circuit causing problem(L :edit) to other neutrals(one by one)

until you get your reading

that should trace it-might be easier ways

 

[pushrod]

isolate power ,turn off mcbs

disconnect circuit causing problem(L and N)

switch on borrowed load

check between circuit causing problem(L or N) to other neutrals(one by one)

until you get your reading

that should trace it-might be easier ways

You wouldn't do continuity tests first? On a completely unknown circuit wouldn't that be the thing that would tell you about the state of all the conductors and eventually that there was a problem with the neutral

and not sure what you mean by "switch on borrowed load" (and how do you know which to turn on)

Am i right in thinking that the problem was a live from a lighting circuit to a light fitting and then returning to the CU via another circuit (socket ring?)

Eco-tech - did this fault just show after a CU change or...

had someone been doing a bit of DIY bodging?

just intrigued as to what had happened previously - cheers

 

[kung]

Seen this done on an extention fused spur off ring supplying lights !

 

[davelerave]

You wouldn't do continuity tests first? On a completely unknown circuit wouldn't that be the thing that would tell you about the state of all the conductors and eventually that there was a problem with the neutral

and not sure what you mean by "switch on borrowed load" (and how do you know which to turn on)

Am i right in thinking that the problem was a live from a lighting circuit to a light fitting and then returning to the CU via another circuit (socket ring?)

Eco-tech - did this fault just show after a CU change or...

had someone been doing a bit of DIY bodging?

just intrigued as to what had happened previously - cheers

take this problem here where you know which pendant is borrowing -we said more or less the same thing
-first disconnect circuit

-bulb out, check between the pendant neutral(with a wander lead) and other circuit neutrals

- bulb in place and switched on you can check between the circuit phase at the board and other circuit neutrals

thats what i'm thinking,never had this problem

 

[pushrod]

Cheers - Reckon i'll just hope my probs are more straight forward - Last time out it took me ages to discover that owner had put a curtain rail screw thru a cable supplying his outside lights which he hadn't used for 6 months. Should have been an easy one but not helped by faults on the garden lights as well - mistakenly thought that the problem was just outside