MCB tripping

Q

quackers

Hi Guys

First time Ive posted , I am stuck and just wondered if anyone has an idea of what I am seeing.
Basically I have a customer (New House 4 years old) that is tripping the lights upstairs.
IR checks out and is as would be expected on a house that old. Zs is exactly the same as the original Installation Certificate.
The house has two bedrooms, one en-suite and one family bathroom.
All switches are unmolested-everything has been left as the builders left it four years ago.
All the lights upstairs are of the low voltage downlights 50W Halogen --God I hate them !!
The lights are on a 6 A Mk breaker. I have replaced the breaker as everything checks out.
However the lights still trip. On or off makes no difference, give it 20 mins and they trip.
All bathroom lights are correct in the zones-no damp.
However there is one dimmer in the bedroom. Have any of you guys come across a dimmer pulling down a 6 A MCB when off ??

Any help or direction greatly appreciated.
Cheers Steve.
 
It sounds to me like an electronic device heating up and shorting. If it's not the dimmer or booster you will have to locate a fault after the mcb, however much flooring etc you have to take out. Sadly after 4 years it's a bit late to tell the little old lady (not LOL in this case !) she should have seriously hassled the house seller at the first sign of trouble in a new installation. Don't give yourself a hard time over cost, I'm sure she will prefer to pay more and get the job done properly, and you'll have the satisfaction of knowing you are the first proper electrician she has hired.
 

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