Testing Help

nicsin02 · Jul 20, 2012

Hi guys starting a new job testing commercial properties, i have passed my 2391 a few years ago and im just looking to refresh myself<

1: when doing an IR test on circuits protected by rcbo's to i have to disconnect both neutral and earth flying leads?
2: what are the flying leads on rcbo's actually for
3: when carrying out a Z's on a socket ring does everything have to be unplugged from sockets
4: same as number 3: for continuity tests

Many Thanks

SirKit Breaker · Jul 20, 2012

1, Yes disconnect everything, but the cpc's must remain connected to the main earthing terminal whilst the circuit is under test.
2, The cream one is a functional earth, it wont work without it connected, the neutral is to enable connection to the neutral bar.
3, No
4, No, but i would disconnect to ensure no faulty loads give dodgy readings.

I would get GN3 and refresh yourself, it will all come back to you in a flash.

Cheers...........Howard

HandySparks · Jul 20, 2012

nicsin02 said:
Hi guys starting a new job testing commercial properties, i have passed my 2391 a few years ago and im just looking to refresh myself<

1: when doing an IR test on circuits protected by rcbo's to i have to disconnect both neutral and earth flying leads?

I leave the neutral and earth flying leads in place and disconnect the circuit line and neutral from the RCBO. As above, leave the CPC connected to the earth bar.

somersetsparks · Jul 20, 2012

SirKit Breaker said:
1, Yes disconnect everything, but the cpc's must remain connected to the main earthing terminal whilst the circuit is under test.
2, The cream one is a functional earth, it wont work without it connected, the neutral is to enable connection to the neutral bar.
3, No
4, No, but i would disconnect to ensure no faulty loads give dodgy readings.

I would get GN3 and refresh yourself, it will all come back to you in a flash.

Cheers...........Howard

On the 'functional earth' point, what do they actually do? they test perfectlt without them