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Topic Title: Insulation Resistance
Topic Summary: 7671 Regs
Created On: 26 August 2013 05:39 PM
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 26 August 2013 05:39 PM
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Vinctn02

Posts: 1
Joined: 26 August 2013

Hi All, I am doing 2nd fix on a mates house (he did first fix). On all of his socket runs I'm getting a mixture of insulation resistance results from 215Mohms to full scale deflection. It's worrying me as I've not been a qualified electrician long and am using a tester he has hired (a megger 1720) one which I'm not so familiar with.

Iam working a long way from home and do not have my regs with me. Are these acceptable results? And what is the minimum ohmns for insulation resistance regarding the 7671 regs? Just to add, on all the jobs I've done the circuits have had full scale deflection.

Thanks for the help in advance, Rodney
 26 August 2013 06:13 PM
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antric2

Posts: 1055
Joined: 20 October 2006

Evening Rodney,
Which readings are the problem;L-N or N-E or L-E.
1Meg is the regulation limit for whole installation test but really anything under 2Meg should really be further investigation.
215Meg is a pass and the IR can be affected by things such as length of circuit(though you should still expect over 500Meg or even a 1000Meg reading on new cable) but I wouldnt worry about the 215Meg reading as its fine.
It maybe that the circuit in question is being affected by some debris on the rear terminals of a socket or damp plaster or the like.
What brand of cable is it.It wouldnt by chance be Doncaster, Copper cable Co or Kabel cable would it.
Regards
Antric
 26 August 2013 06:41 PM
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Gutterball

Posts: 14
Joined: 28 June 2011

Your an electrician and don't know what the minimum IR is ?
 26 August 2013 06:58 PM
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perspicacious

Posts: 7232
Joined: 18 April 2006

"Your an electrician and don't know what the minimum IR is ?"

And there's me thinking I can be, well shall we say, a little blunt?

Regards

BOD
 26 August 2013 07:07 PM
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antric2

Posts: 1055
Joined: 20 October 2006

Originally posted by: perspicacious

"Your an electrician and don't know what the minimum IR is ?"



And there's me thinking I can be, well shall we say, a little blunt?[IMG][/IMG]



Regards



BOD


It was straight for the jugular wasnt it . I just took a big slurp of my tea and went to another thread
 26 August 2013 07:27 PM
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perspicacious

Posts: 7232
Joined: 18 April 2006

"It was straight for the jugular wasnt it"

I was expecting some responses mentioning Part P......

"I just took a big slurp of my tea"

I've worked up an (alcoholic) thirst putting up the steels for the UB for a girder trolley and it would have helped if, on two counts, that I thought to make the the vertical UBs "handed" and didn't have to weld back in the piece I cut out and re mag drill it and secondly, that I could have chosen an afternoon with less than 30+ deg under the "asbestos" Big 6 roof. I'm too old (and fat) for these sort of antics but I need to sort it out so I can have somewhere to play in the winter

Regards

BOD
 28 August 2013 12:20 AM
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weirdbeard

Posts: 1528
Joined: 26 September 2011

Originally posted by: perspicacious

"It was straight for the jugular wasnt it"



I was expecting some responses mentioning Part P......



"I just took a big slurp of my tea"



I've worked up an (alcoholic) thirst putting up the steels for the UB for a girder trolley and it would have helped if, on two counts, that I thought to make the the vertical UBs "handed" and didn't have to weld back in the piece I cut out and re mag drill it and secondly, that I could have chosen an afternoon with less than 30+ deg under the "asbestos" Big 6 roof. I'm too old (and fat) for these sort of antics but I need to sort it out so I can have somewhere to play in the winter



I hope this approach isn't reflective of your electrical methods!
Practice what you preach et al.......
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