Please discuss...
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Discuss r1+r2. calculate or measure... in the UK Electrical Forum area at ElectriciansForums.net
Apologies abit (very) vague . Upon undertaking a conditon report and the circuits have been energised for many years. Do you measure r1+r2 or just do Zs/Ze and calculate r1+r2. For socket circuits odviously the correct test procedure needs to be done.
For example R1+R2 on a lighting circuit in small flat is say 2.50ohms you'd immediately know loose connection. Yet you could take a Zs on the same circuit and it could be more like 0.70ohms. (something to do with the current from the test kit i believe, but i dont know correct terminology) I think its more important to do r1+r2 because of this. Also parallel paths occasionally bringing Zs values down.
Please discuss
No your point isn't simple enough, I haven't got a clue what you are talking about here.
You say some people just do a Zs test, and as I pointed out some people do no tests at all. Neither of these makes them correct just because some people do it.
I prefer to measure R1+R2 Ze and mostly calculate Zs. For the reasons i have explained above. Im after others opinions. Now im simply after a discussion on what others prefer / do and why. It really is simple buddy. It really is.
It is permissable to calculate Zs from measured values. It is always preferable to measure Zs though.
It is not permissable to calculate R1+R2 from other measured values. It must be measured.
The main purpose of EICR testing is to ascertain compliance for disconnection times and safety for continued use of circuits.
To this end some ÂŁ80 a time jockeys don't do continuity testing.
I always perform a full range of tests on all circuits.
I think this is what you were asking about.
Malcolm - i couldn't agree more.
A few years ago, i put a 'tick in the R1+R2 box - i got called up on it by a spark about 4months later. Only to shoot him down by showing him GN3.
Lots of sparks don't even understand what it means if you tick the R1+R2 box.
The Regs require a continuity test with a current not less than 200mA, this will not stress the installation nor verify terminations. iT does however show open circuit connections.
GN3 suggest where paralell paths exist when testing, the unrliable readings may be omitted and a tick put in its place.
whether you use R1 + R2, or the long wander lead, Personally, recording the values has a value. Most schemes probably insist on them?
Cheers
First and foremost you're supposed to identify parallel paths and where possible remove them for testing purposes only - so you get a proper reading.
I don't agree that recording an incorrect and unreliable value as opposed to a tick in that situation would be the correct way to fill your cert in. But thats just my opinion. Each to their own.
My view on the 'tick' is that you're ticking to confirm that you've done the R1+R2 and that the reading isn't reliable.
Mark.
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