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Can anybody point to a regulation where 0.05 ohms is the maximum allowed measurement between points.
Discuss Extraneous bonds values in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
This should generate some interesting replies! Good question.
off the top of my head it's mentioned in GN3. I think. Will go and have a look am a bit rusty
Can anybody point to a regulation where 0.05 ohms is the maximum allowed measurement between points.
From where to where?I had a reading that was 0.5 ohms,
It has nothing to do with short circuit.and consultant was saying oh that's too high. I was like WTF, are you seriously suggesting that that is not a short circuit?
How do you work that out?In fact the reading can go much higher and still be a good connection.
It's not a regulation but -It's just pure bull.
As nobody can pull any regulation out, just guidance notes, gives me a good argument.
I don't really understand that but -The reading was taken from a wall socket earth to the access floor tile.
Again, I don't understand.Mostly I was getting 0.05 ohms, but in this particular area it was 0.5
Consultant said to run a bond from board to pedal stool.
You are probably right.I said I would once all the flooring had been completed. Reply was because the floor was incomplete it can become live. Utter bull****.
its ridiculous, i have come across these floors before.In that case, if you are getting 0.5 ohms between socket CPC and floor then it must be bonded somewhere already.
Is he on about supplementary bonding between socket CPC and floor?
Running a main bond from stool to board would be strange.
it would be a lot lower from unistrut etc to it.Sorry I was nor clear, we was just taking measurements, no bonds were actually in place. The floor will get an earth via floor boxes.
However we was measuring continuity between wall socket cpc, and tile.
All extraneous earth's were measured.
From uni strut to tray work to trunking to ceiling grid to steelwork etc etc etc.
I was just trying to clarify if there was actually an regulation that stated these measurements should be below 0.05 ohms
Can anybody point to a regulation where 0.05 ohms is the maximum allowed measurement between points.
As nobody can pull any regulation out, just guidance notes
A misunderstanding of the Guidance Notes at that. It is suggesting that would confirm continuity between two points. It is NOT suggesting that the resistance of the main protective bonding conductor should not exceed this.
Unless of course the contract electrical specification calls for this as a maximum value.
Granted, but that would be a contractual issue.
https://www.youtube.com/watch?v=rnvNfI__kYUThe 0.05 figure is just the value that is acceptable for a connection. So if you fit an earth clamp to a copper pipe, the value between the conductor connected to the clamp terminal and the pipe it's connected to should be no more than 0.05ohms. It's to confirm the connection is good. If you had a 70m run of 10sq.mm, it's not going to measure 0.05 ohms end to end is it.
It's strange that he doesn't say why.
Also, the extraneous-c-p is the pipe which comes out of the ground, not where it is bonded, but that's another story.
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