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Did anyone else only read the first five words of the thread title?
Discuss I am getting very high zs readings in the UK Electrical Forum area at ElectriciansForums.net
I think what @westward10 meant was to carry out a L to N live loop test, as opposed to a dead continuity test of R1 and RnR1 and Rn are same on lighting circuit
That's really why measuring R1+R2 dead, and calculating zs from the ze/zdb + the measured circuit loop resistance is the usual practice, it allows you to obtain the minimum zs whilst not exposing users to an un-bonded system.That's actually how I was taught and what GN3 appears to say; Julie's logic and reasoning is spot on, and in this case I might have done it anyway to help build a picture of what is going on.
No argument about the logic/reasoning. I'm also mindful that GN3 implies that in all circumstances where you have live final circuits (required for these tests) you should have the bonding connected. But it also doesn't specifically describe the Zdb test as far as I can tell.
It only seems to discuss two cases - testing external earth loop impedance with main earth disconnected, and all other earth loop impedance tests where it says that "for safety and practical reasons neither the connection with Earth nor bonding conductors are disconnected". (Page 66)
So while I think it might have been a handy test to do I wouldn't say the OP is doing it wrong either.
good shout!Did anyone else only read the first five words of the thread title?
Exactly.by disconnecting main bonding conductors to water and Gas?
Megger 1741+ .
Reply to I am getting very high zs readings in the UK Electrical Forum area at ElectriciansForums.net
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