Bathroom Light

Not likely the MCB, is more probably something they have plugged in / fixed equipment?
You also don't say where your test is from, L-N?
 
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Only things plugged in are fridge and washing machine which was the same situation before energising the board. Yes test was from L-N
 
You are bound to see a L-N resistance with items plugged in, the resistance of the devices is probably less than a few ohms in total. You are measuring Millions of Ohms with an IR tester!
Unplug everything before carrying out IR testing.
 
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You might also find out the expensive way that items with semiconductors in them don't like to be IR tested too!
 
I know the fridge is still working but haven't tried the washing machine :eek:
 
It's the fridge.

The first time it was probably cold, so was effectively switched 'off' via the thermostat.
The second time it had been off for a while, so the fridge had warmed up and the thermostat operated. You were measuring across the motor, which would show up as a very low resistance.
 
Excellent makes sense.......many thanks. Off to try it now, fingers crossed :rolleyes:
 
It was the fridge......thanks very much to both of you for your help, much appreciated :D

I note also that rcbos dont like 500v, even with the aux tails out :rolleyes:

cheers,

Tonyx
 

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