IR test

[iamelectric]

can anyone tell me when testing a lighting circuit between L&N to earth what does it prove , cheers

 

[timbobelfast]

Depends on the reading obtained? Handy way of IR testing when you don't want to damage certain equipment lol

 

[telectrix]

it proves tha there is no breakdown of insulation between live conductors and earth, so when you throw in a RCD it won't trip.

 

[iamelectric]

cheers

 

[shagbite]

the clue's in the name - insulation resistance. you're testing to prove the integrity of the insulation.

testing between live+neutral and earth is normally carried out when there are loads on the circuit that you can't remove.

 

[7029 dave]

is the test still with all switchs closed and bulbs out?

 

[Richard Burns]

All switches closed, switch two way switching, if you can remove lamps then good, but should not be required. Surge protection devices on socket extensions cause problems though.

 

[7029 dave]

thank you Richard,nice to know still pretty much the same, 33yrs on!!

 

[shagbite]

is the test still with all switchs closed and bulbs out?

tests should be carried out by operating the switches one at a time, with additional tests for every flick of the switch. remember, you want to ensure that none of the circuit insulation is defective - not just the insulation up to the switch.

 

[iamelectric]

cheers guys , i was meaning more on EICR if the light have been working perfectly fine with no faults , no tripping , then what does the L&N to E prove , tel cleared it up with insulation breakdown