Zs testing on a light circuit.

[Deleted member 26818]

If you just mean that your Megger says 'trip' on the display while you are trying to carry out your Zs test, and the MCB &/or RCD stays on, it's probably because your probes are loosing contact with the terminals momentarily. Push hard. No, harder. Goddam it man, harder than that....

Is that post to Dave or Johnny?

 

[JulianC]

Meh, bit of both

 

[JONNY BRIGGS]

I have a megger 1552

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I have a megger 1552

 

[JONNY BRIGGS]

Im using 2 leads, earth and phase leads

 

[JONNY BRIGGS]

yes mate, im using no trip but it still trips

 

[electric will]

You need to be using 3 leads if the circuit is rcd protected

 

[JONNY BRIGGS]

No the rcd doesnt trip and I do use the trip function on my testers but i get trip on my meggers screen when I test earth and phase on loop

 

[onions1066]

Does the mcb actually trip or is that just what your tester reads.

 

[Sintra]

When the meter is on no trip 3 leads must be used whether or not there is an RCD on the circuit.

 

[JONNY BRIGGS]

Hi mate, thanks for your response. It does have a rcbo, I have done the simple 2392 qualification and wasn't taught the different ways to test if rcd protected. I thought you could get a zs on 2 leads? how do you test with 3 leads on lighting zs.

Many thanks

 

[bigbaddave]

I use a metrel and it requires me to connect N-CPC to earth and L- Live

U not have the distructions ?

 

[JONNY BRIGGS]

Yes Dave, it has a rcbo

 

[Sintra]

1. Put the meter on no trip.
2. Connect all 3 leads into meter
3. Croc green lead to CPC
4. Push black probe on neutral
5. Push red probe on live
6. Hold tight and wait for result

 

[JONNY BRIGGS]

mcb doesnt trip it just what the tester is saying

 

[JONNY BRIGGS]

Thanks mate, best answer yet. I have just been putting phase and earth probes on and not neutral. thanks bud.