Verifying polarity on radial ccts

[davesparks]

Exactly. You would not IR test only one of the L/N conductors, so why only check loop resistance of one?

The only conductor we are required to check continuity of during testing is the CPC, the R2 test is sufficient for this and acceptable, an R1+R2 test is more normally carried out because it is easier, and it checks polarity at the same time.
[automerge]1598267779[/automerge]

The thing that is confusing me is how does performing only a R1+R2 on a radial socket cct (and operating switches to make sure it breaks) confirm polarity.

The R1+R2 test proves two things, the continuity of the CPC and the polarity.

If the polarity was reversed then you would not get a reading as there would be no continuity.

Remember the polarity test is confirming that L and N are the right way round.

 

[radiohead]

The only conductor we are required to check continuity of during testing is the CPC, the R2 test is sufficient for this and acceptable, an R1+R2 test is more normally carried out because it is easier, and it checks polarity at the same time.
[automerge]1598267779[/automerge]


The R1+R2 test proves two things, the continuity of the CPC and the polarity.

If the polarity was reversed then you would not get a reading as there would be no continuity.

Remember the polarity test is confirming that L and N are the right way round.

The OP's point was that if L and E connections at a socket outlet are reversed the R1+R2 test will not indicate that, it may only be apparent when EFLI tests are carried out, in which case a dangerous fault will be energised before being discovered.