If doing a 500V IR test between L & N then obviously you have to be very careful not to fry anything. But.... has anyone ever damaged anything by conducting the test between L & N connected and earth. As per Guidance Note 3 this is a valid test when doing a PIR. And what about between N and E. Any problems? Just curious.
As with all insulation tests on an unknown circuit... tis sensible to start with a lower voltage first
As with all insulation tests on an unknown circuit... tis sensible to start with a lower voltage first Quite right. If I'm not sure all loads have been removed, I'll start at 250v and see what kind of reading I'm getting.
Yes I accept that starting at 250V is a good idea. Do people always do the three tests ie between L & N then L & E then N & E. Or if its a PIR and a pain to disconnect all loads do you consider a test between L and N connected and E sufficient.
Yes I accept that starting at 250V is a good idea. Do people always do the three tests ie between L & N then L & E then N & E. Or if its a PIR and a pain to disconnect all loads do you consider a test between L and N connected and E sufficient. I'll do all tests if I know all loads are removed, if not, then the GN3 method of phase and neutral together to earth is acceptable and reasonable, certainly if you've a floor of discharge lamps in a factory, you'll be limited to what you can do, what is reasonable, what access is granted.
Quick IR Test.. Isolate power to DB and from the dead side of DB mainswitch do stuff..likewise from dead side of RCD (if splitloader)..all loads and stuff removed if possible (if not isolate circuit which cannot be cleared) and then do the business..on a rewire just do each individual leg..yes?..
JP, make sure you remove the RCD, or you could damage it even if it is switched off, may still be a connected coil. And the rest is basically what we've already discussed, removing loads and what to do if you can't. It isn't always possible to.
JP, make sure you remove the RCD, or you could damage it even if it is switched off, may still be a connected coil. And the rest is basically what we've already discussed, removing loads and what to do if you can't. It isn't always possible to. All points taken on board Capn Squarewave Sir..
Ahh but....yeah but....no but No ones answered the question. 'has anyone ever damaged anything by conducting the test between L & N connected and earth. And what about between N and E. Any problems?' Anyone.
Ahh but....yeah but....no but No ones answered the question. 'has anyone ever damaged anything by conducting the test between L & N connected and earth. And what about between N and E. Any problems?' Anyone. Why should you damage anything with L/N together?
As with all insulation tests on an unknown circuit... tis sensible to start with a lower voltage first Something I do as a matter of caution..
this is acceptable only for a pir i think. Neww installs all tests, allready energised circuits test to earth only accesable
'has anyone ever damaged anything by conducting the test between L & N connected and earth. And what about between N and E. Any problems?' Anyone. Ok... I haven't
'Why should you damage anything with L/N together? ' You shouldn't. I'm asking has anyone. You never know. BTW wk, I know 'thats the point of joining them.' My first post made that clear.