Discuss conduit used as cpc. in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

A

amicus

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Hi. On an inspection is it still ok for the conduit to provide the earth if the continuity/loop tests show up good.Its a communal lighting system in 60,s built scheme.They are fed via retro fitted rcd/mcb garage type unit.
 
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S

Spudnik

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  • #2
Perfectly ok, but ensure you do a good visual inspection where you can, and all the tests are within limits.
 
A

amicus

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  • #3
Thanks,i thought it was, but you get so many differing opinions on whats req by 7671 you start to loose confidence in whats right or not.It wasn,t like this on the fourteenth edition.
 

old dog

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Arms
oh kids today try
section D starts on page 72 or
section E page 82
reulations E.3, E4 and E5
 
S

Spudnik

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  • #8
Oh!

Gotta be honest, i dont have that one, and i wasnt being serious about earthing then!

Or was i correct???
 

old dog

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Arms
yes i know you were not being serious just thought i would look up the old book
to find the regs for them.
now maybe someone amicus possibly conduit was always used as cpc no seperate cpc
then when the 15th came in we were called back to some large installs
to pull in a cpc in .
 
A

amicus

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  • #10
Hi Old dog.You must be as old as your name suggests.Like you i started out on that edition and have been going downhill eversince.Pipework was considered supreeme back then until it started to rot if not instaled corectly and green,sorry green & yellow was introduced to correct this.It gives cause for concern now when they are absent.I also had a lot more hair then.
 
A

amicus

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  • #12
I,m more of a Brew Ten bitter man myself.
 

old dog

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Arms
hi amicus i was trying to think back when we worked to the 14th
i started off in glasgow there was no need to run a cpc in tube.
howeverer we done it as it was considerd good practice .
i was living in london when the 15th edition came in then the company i was working
for started to pull in a cpc ( whitch i was doing anyway) now to the question
was the conduit considerd adequate in the 15th sorry if i rambled on
but you know what its like when you get to our age
 
A

amicus

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  • #14
As far as i remember Earth Wires in pipe came in around 75-76.Not sure about 15th requirements,but over the years have come accross many cases of lost earth due to corrosion or loose bushes,which going back to question,these couplings set in concrete cannot be inspected and to say all is A ok for the next ten years when corrosion is well advanced (but tests ok) is a little worrying.Do you think the presence of the RCD compensates future problems in the pipework.
 

old dog

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Arms
i think the future will rely far to much on rcd .the ink on the 17th is still wet.
and all i hear thats ok its rcd protected. rcd is additional protection it is not the be all and end all.
at the end of the day if the mechanical switch sticks then you should still be able to meet disconnection
times. any conduit i run will have a cpc and as you say corrosion or loose damaged couplings
after ten years wont be a big problem and dont forget the good old rcd will be there aswell
 

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