How to test a circuits in steel conduit as the cpc

[Questforknowledge]

Good evening

I am currently a training to become an electrician. I do hold both initial verification and periodic testing qualifications however this is an issue I have never personally had to deal with and was never mentioned on any of my courses as often seems to be the case.

Basically I am wondering how you would hypothetically go about testing either a ring or radial circuit if you didn't have a seperate cpc but the conduit itself acted as this.

Look forward to hopefully getting a response and some clarity

Regards Harry

 

[Deleted member 26818]

Yes in the Brown book 413-02-15 is deleted.
That’s because, 413-02-04(i) says virtually the same thing.

 

[spark 68]

So spin, in the 18th it looks like they have combined the Ut and disconnection time into one reg.

Really since the 17th first came out the SB rules were relaxed in domestic subject to certain caveats (rcd being only one) which we were all glad about re: god awful G/Y everywhere in bathrooms , it is still a valid additional protective measure though elsewhere as always.

Ps. I was correct about the 25V Ut in agricultural in the 16th

 

[Deleted member 26818]

So spin, in the 18th it looks like they have combined the Ut and disconnection time into one reg.

Really since the 17th first came out the SB rules were relaxed in domestic subject to certain caveats (rcd being only one) which we were all glad about re: god awful G/Y everywhere in bathrooms , it is still a valid additional protective measure though elsewhere as always.

Yes, it has made life easier.
Though there are two problems I have encountered.
One is that very rarely the Zs on some circuits of locations containing baths and showers, are not sufficiently low enough to allow ADS.
Two is that if there is no main bonding because of plastic services, can supplementary bonding still be omitted?

 

[spark 68]

Probably, as plastic services mean that caveat no longer applies in most cases, and we are now reying solely on RCDs , god how I wish the IET would sort their existing s**t out before introducing new regs

 

[spark 68]

As another poster earlier had said re: 'ductor testing joints in conduit, I have had to do this twice back in the day, what a mind numbing and boring job that was
Later with more modern MFTs that cut-out if the CPC rises above 50V (or 25V if you set it up that way) we have on occasion just used a hi-current loop test to check for reasonable integrity, no other test was specified in this case, so it was better than relying on a 20mA continuity test only in the first instance.

Ps. did the continuity test first btw

 

[freddo]

ONLY after full RA and discussion with those fully aware of possible downside of such a test

Na, whack it on and watch those sparks fly. (Though you won't get any sparks on my wonderful conduit work)

 

[PEG]

Na, whack it on and watch those sparks fly. (Though you won't get any sparks on my wonderful conduit work)

.....and this is why,i never got a repeat EICR,at the magnesium ribbon factory....