low ac volt reading.

ambrad · Jul 30, 2013

After installing a garage unit i carried out a voltage test at the furthest point of the installation. i got a reading of 112.5 v L-N. I checked it L-E and got 242v.

I ended up back at the rcd and measured the live side and got 242v. When i checked the load side i got 112.5 v. I disconnected the load live from the breaker and got 1125v again. Does this indicate a faulty rcd or could there be some other issue i am missing. Just to let you know the load was only an ac isolater ready for a solar pv system.

Help please.

thanks

telectrix · Jul 30, 2013

sounds like a faulty RCD, on the neutral side. just make sure the connections on the RCD and N bars ar good and tight.

Marvo · Jul 30, 2013

Sounds like the neutral may be missing, take the tests again with an analogue tester you'll probably see the fault a lot more clearly.

Engineer54 · Jul 31, 2013

Yep, an analogue voltmeter can be worth their weight in gold at times!! lol!! A must have for every electrician, even if it's a cheapish bog basic model.... Just don't throw it about too much!!