Testing Zs at Lighting switch's with no neutral

[ian.settle1]

Shakey

It was a Megger LCB2500/2 meter but never used it that way. Took Ze & Zs readings as normal along with R1+R2 by continuity meter.

 

[Shakey]

Shakey

It was a Megger LCB2500/2 meter but never used it that way. Took Ze & Zs readings as normal along with R1+R2 by continuity meter.

Glad to hear it Ian, I would expect nothing less from you

good example to throw into my students though....

cheers

 

[alancp]

stop me if i am wrong but the certs ask for the MAX efli for that circuit, so if we have a pendant (end of line) at the top of stairs, and is 2 way switched, then obviously the max reading would be at the remote switch.

 

[Shakey]

stop me if i am wrong but the certs ask for the MAX efli for that circuit, so if we have a pendant (end of line) at the top of stairs, and is 2 way switched, then obviously the max reading would be at the remote switch.

if its done 3 plating at the pendant, then thats where the max Zs would be

 

[johnosman]

I would love to know what the megger rep says as some of the sparks I work with have been told that that particular test instrument does give you an r1+r2 reading. I have never used this reading myself as you are never asked to submit a ze reading that the machine can deduct the zs from ze to give you r1+r2 so as far as I can see it would be impossable for a tester to give a reading even if it was just deducting ze from zs. I probably have'nt explained it very well but according to the rep just by doing a test for zs the tester will give an r1+r2 just by doing this one test and nothing else.