Discuss I.R test before cu changeI in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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I have been following a heated debate on this subject ,its been suggested to I.R test circuits before cu change.if doing so are you testing through main tails or individual circuits both would involve lamps out sockets and appliences dissconnected this would take time and could risk damage to sensitive circuits that you have missed, i put a tong meter on the main earth tail from the cu to the meter and check to see if there is any amps present if so i have a earth fault on the installation i would then scale down testing to find the circuit with the fault this of cause would not show up if the cu has no rcds but would as soon as you fire up the nice new cu with nice new rcds it works for me i am at present on 2391 and this subject is a good one
 
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L

lionelmcc

good call
I always worry about missing something on IR tests and usually join the phase and neutral together and test between them and earth.
Unless I really know the property and installation well, or if it's my install, I get this niggle before I push the test button
 
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G

Guest123

Sorry guys, I aint gettin involved with this one dont know who I might offend!!!:eek:. My views are in the other thread.:)
 
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  • #4
HI LENNY
You will get no slagging from me i appreciate all the help you and the other sparks offer on here i am new to this trade and setting up on my and this site is a great source of information for me and others like me do you go with my testing method of using the main earth to check for any leakage of amps to earth with tong meter
 
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G

Guest123

Yeah, it absolutely makes sense. The only thing I would say is to make sure that all high leakage appliances such as computers, heating appliances and other resistive loads are removed from the circuit as this may give a false indication of earth leakage on the circuit and you could possibly go looking for a fault that isn't there.

Have you got one of those nice earth leakage clampmeters that will measure milliamps??
 

diditrain

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Arms
One bit of advice is to test at 250volts first. That way you will identify if a load is still connected if you get a poor reading between phase/neutral. Then crank it up to 500 if everything is ok at 250
 
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  • #7
Allways tricky this one I.R on cu changes!! thanks lenny and also trainy graet idea about buzzing 250vs simple ideas like that can save me time and money keep up the good work
 
L

lionelmcc

I'm with Tuckermot

I'm not into slagging off people for trying to be helpful. and, like tuckermot I am trying o get going myself
I'd like to extend my thanks to all who posted on this site
 
S

Spudnik

I get this niggle before I push the test button
Once you get going that feeling soon disappears.

Like others have said, test at 250V first to make sure everything is disconnected.

If you get a flat reading anywhere, then its possible a spur is hidden away somewhere still switched on, or there is an outside light with a PIr sensor on it.
 
L

lionelmcc

thanks Jason ,those are helpful tips
 
R

ron55

Apologies Ron,

Its now been archived.
Actually I did find it before you "archived" it. It was titled "what tests do prior cu change" and the guy you took a dislike to had some pretty good points presented in an orderly manner.

In real terms you censored it because he criticised a moderator. Weather he was right or wrong have you never heard of free speech?

Cheers, Ron
 
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