insulation resistance test method 2

[Dean Williams]

Hi gang
im currently testing a power station,
ive been told to use method 2 ie link live to neutral and test to earth on all the lighting circuits, which are all in SWA on tray with no switches in the circuits.

all readings ok so far, but the last couple are reading 0.00ohms.

these circuits have emergency light fittings in them but i thought using method 2 bypassed the load, can anyone offer an explanation please?

thanks

 

[Brightspark2]

No you can still get false readings with some loads.

How many emergency lights are there, can you not just disconnect them to try it?...

 

[Dean Williams]

too many to disconnect really, but i'll have to try it on one circuit to prove this. thanks

 

[Deleted member 26818]

Do the E fittings have their own permanent supply?
Have you joined that supply to the neutral and the other supply?

 

[Dean Williams]

the e fittings have only 1 supply. in each area there are 2 lighting circuits, 1 from the 'essentill' db and 1 from the 'non-essential' db. the fittings on the essential db are emergencys. could be a cross between the neutrals between the 2 dbs.

 

[Brightspark2]

the e fittings have only 1 supply. in each area there are 2 lighting circuits, 1 from the 'essentill' db and 1 from the 'non-essential' db. the fittings on the essential db are emergencys. could be a cross between the neutrals between the 2 dbs.

Yes could be a 'shared' neutral...