Bonding non-protective conductor conduit

[Paulie Prestoff]

Recently qualified and started working for a company that don't put a fly lead from socket outlets to back boxes and ceiling roses to conduit boxes etc. The engineer says you don't need them because the circuit has its own CPC and the conduit isn't being used as an earth.

My understanding was it was still an exposed conductive part and had to be bonded??

(It does go back to trunking but It's the new type of 'conlok' conduit which you tighten ends with a grub screw. I was always taught that it isn't mechanically reliable as a continuous earth path. )

I can't find anything in the regs

Any help or advice would be appreciated.





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[Pete999]

Recently qualified and started working for a company that don't put a fly lead from socket outlets to back boxes and ceiling roses to conduit boxes etc. The engineer says you don't need them because the circuit has its own CPC and the conduit isn't being used as an earth.

My understanding was it was still an exposed conductive part and had to be bonded??

(It does go back to trunking but It's the new type of 'conlok' conduit which you tighten ends with a grub screw. I was always taught that it isn't mechanically reliable as a continuous earth path. )

I can't find anything in the regs

Any help or advice would be appreciated.





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Your company, are they a bit tight fisted?

 

[Paulie Prestoff]

Would seem that way lol


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[Risteard]

My understanding was it was still an exposed conductive part and had to be bonded??

Exposed conductive parts are earthed, not bonded.

I would be concerned about the electrical continuity of Conlok-type conduit myself. Screwed conduit will give good continuity when properly erected.

 

[Paulie Prestoff]

Yeah sorry I have still a bit to learn with correct terminology.



That was my thought but I can't find anything specific in the regs, only conduit used as a protective conductor


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[Andy78]

411.3.1.1 is where you want to be looking, and 411.4.2 for TN systems. All exposed conductive parts must be earthed.

Conlok's manufacturer's reckon it meets the BS for continuity.
http://www.demoncato.co.uk/wp-content/uploads/2015/11/Conlok-FAQs.pdf

I've never installed it, but I have seen it and would not trust it myself either. Is the trunking system effectively earthed ?

 

[Brightspark2]

Socket to back box doesn't need earthing as long as there is one fixed lug in the back box. The faceplate screw will connect the back box to earth. I still put a link in though as I believe it's good practice.

Usually as long as the conduit is earthed at one point then it should all be connected. Im not sure with the conlok system as I haven't used it.

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[Paulie Prestoff]

So if conlok does meet BS for continuity (and is installed properly) it would seem more like bad practice than not meeting regs.
I personally wouldn't take the risk but it's not my call

Thanks gents


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