Lighting fault which I cant explain! | on ElectriciansForums

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L

LlandrilloSpark

Fellas
Had a call out to a tripping MCB, 6A Starbreaker, the kitchen lights trip the breaker intermit idly.
The lighting arrangement is 5 X 35w LV Halogens on a wire rail, voltage is stepped down via one 210VA transformer, I tested the cable from the switch (looped N) to the transformer L-N, reading was >600Meg, I removed the lamps and tested the L-N on the rail >500 meg, The transformer was replaced last week by a DIY friend so that is new, no trapped conductors in the switch.
Swapped the 6A starbreaker for one I had in the van, tripped again, replaced it with a 16A as its wired in 1.5mm and it has cured the problem, it’s only a GF flat and there are two lighting circuits, I can’t imagine that half the flat can draw more than 6A?.
I’m going to order a 10A as I can’t be sure it’s wired in 1.5mm throughout and also a type C 6A.
I also couldn’t find any high loads on that circuit, like a DIY socket?
Any ideas?!!
 
Very strange indeed. I would check that the circuit doesn't supply anything in any other flats. I was once working in a flat, isolated the lot and the kitchen sockets were all still live! They were being supplied from the flat above!
 
Coincidently at a quite today I noticed they had a frost watch heater connected to the light circuit in their entrance hall, apparently it was put there to keep their shoes warm before they put them on.
 

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