micc on rcbo

[buzzlightyear]

I westward 10. just lights

 

[Octopus]

biting my lip!

 

[Pete999]

Ive bitten mine.

 

[westward10]

Does it need rcd protection, if the circuit is MICC throughout it probably doesn't need it.

 

[buzzlightyear]

yes westward 10 the micc is buried in the wall

 

[Octopus]

So go on then, tell us the N-E IR reading.....

 

[Pete999]

yes westward 10 the micc is buried in the wall

Is the cable earthed?

 

[buzzlightyear]

yes pete999 tested line to earth >999 neutral to earth >999

 

[westward10]

Is the cable earthed?

I don't think rcd protection is required but he would need to fully verify that.

 

[Octopus]

So the RCBO trips, yet the MCB holds and the IR N-E is 999 - so maybe change the RCBO?

Were the lights "on" with the laps removed when you did your IR?

 

[buzzlightyear]

all micc lighting cables are buried in the walls in the flat that I working in .

 

[westward10]

Does it go into the shower/bathroom.

 

[Pete999]

yes pete999 tested line to earth >999 neutral to earth >999

When you swapped from RCBE to MCB is there a chance you could take an earth leakage reading, that may throw some light on the problem, as the problem is pointing to a leakage fault somewhere.

 

[buzzlightyear]

possible pete 999 .

 

[Lucien Nunes]

IR seems good so cable probably sound. If the total circuit length is great, capacitive leakage can be significant. Use a leakage clamp to measure differential current of L & N, not CPC current and report your findings, also the results for a ramp test of the RCBO.

 

[Richard Burns]

With good IR results for both L-E and N-E I would ask if you have you got the neutral connected correctly?

 

[buzzlightyear]

yes. mr burns no neutral out. and class 2 light fittings & switchs

 

[Richard Burns]

I am asking if the neutral core is connected to the RCBO and not to the neutral bar, as if you have been swapping back and forth MCB to RCBO this could get missed.
If the light fittings are class II then there cannot be an earth fault there so there must be something else causing the problem.

 

[westward10]

There could still be an earth fault even if it is all Class 2.

 

[hightower]

This thread made me chuckle. What's been said in it could have been said in 3 posts if the OP had put all the information in to begin with.

OP, does your internet provider charge you extra for using prepositions and the like in sentences? Or where you just replying while there was water on the boil?