Metal comduit as cpc

[ryan24]

Hi all.

whats people's thoughts on having class 1 switches and fittings on an installation that is wired in old imperial conduit acting as the sole cpc? If there's a fly-lead from switch to back box surely this will be fine? Getting a lot of mixed anwsers on this some saying no good others saying perfectly fine? I personally think it's not a problem as conduit can be the best cpc you get. Any one else dealt with this? Thanks

 

[Knobhead]

Jay, you never have and hopefully you never will require the additional “earth” in metallic containment.

But as Paul pointed out it comes down to twitchy designers.

The continuity testing your mentor mentioned would be using a Ductor. Pressure testing is totally different.

 

[jay sean]

It was part of the spec,
We would have a testing company come in and test the work for us.
I dont know why they never had 'earth' wires installed

 

[Fin170]

Metal conduit and swa armouring has to be mechanically and electrically sound (or words to those effect), adding a cpc 'just in case' is wasted material (assuming the job is done properly, which it must be or you wouldn't be adding a cpc would you?)

If pyro was not so expensive I wonder if there would be threads asking if they need an internal core in that in case the sheath is not up to the job....

 

[jay sean]

Seperate earth wires I think have only been used since the 80s and the use of PVC trunking/tube.

 

[ipf]

Seperate earth wires I think have only been used since the 80s and the use of PVC trunking/tube.

Nope. But they did become more common with the 15th edition, earth everything and anything, regs.

 

[Knobhead]

Seperate earth wires I think have only been used since the 80s and the use of PVC trunking/tube.

We’re talking of metal conduit!

 

[Guest125]

As long as the cpc is continuous then all good. No where does it say the coc MUST be a cable.

 

[Guest125]

Sorry cpc. Bloody phones.

 

[Engineer54]

The metal conduit or metal containment Zs value is not just fine it will generally knock a separate CPC value in to a cock's hat!! There is not a single CPC conductor in any of our conduit installations and this project is a good 85+% conduit install for final circuits!!

 

[shanky887614]

It doesn't help that the new AM2 doesn't cover conduit. It's going down the domestic route so less and less electricians are competent with conduit!!

conduit, your joking?

there is no containment in the am2 now

 

[shanky887614]

The metal conduit or metal containment Zs value is not just fine it will generally knock a separate CPC value in to a cock's hat!! There is not a single CPC conductor in any of our conduit installations and this project is a good 85+% conduit install for final circuits!!

your right there, we did a a rooftop plantroom, there was that much steel iin there we barely got a reading doing R2 tests

 

[Engineer54]

conduit, your joking?

there is no containment in the am2 now

It's WHY you need NVQ3 these days, the essential bare bones of the real electrical industry is no longer being taught. All they want to turn out these days, are electricians able to work in the domestic sector!!

And a good many of those NVQ3 being awarded are being gained fraudulently....

 

[ipf]

It's WHY you need NVQ3 these days, the essential bare bones of the real electrical industry is no longer being taught. All they want to turn out these days, are electricians able to work in the domestic sector!!

And a good many of those NVQ3 being awarded are being gained fraudulently....

AND, ..a good deal of these under qualified are overconfidently taking their lack of knowledge and experience into the industrial and commercial sectors of our game.

Why bother about qualifications or experience when you can get a job done cheaper

The ignorant wonder why the experienced amongst us are worried!!!!

 

[Engineer54]

AND, ..a good deal of these under qualified are overconfidently taking their lack of knowledge and experience into the industrial and commercial sectors of our game.

Why bother about qualifications or experience when you can get a job done cheaper

The ignorant wonder why the experienced amongst us are worried!!!!

Can't see how the wannabes would survive in an industrial environment or in a fair sized commercial project without metal containment skills, which virtually none of them will possess...
The vast majority of them are sole traders masquerading as electricians, bodging around in unsuspecting peoples homes!!

 

[ipf]

Can't see how the wannabes would survive in an industrial environment or in a fair sized commercial project without metal containment skills, which virtually none of them will possess...
The vast majority of them are sole traders masquerading as electricians, bodging around in unsuspecting peoples homes!!

That's just it, it's not in fair sized projects, it's alterations in factories where I'm coming across it, and they seem to get away with it. As you say, the vast majority are just bodging around in peoples homes. A great deal of my income has come from work in small local industry over the last 30 years, maintaining and installing machines or just general installation. Some of the installation work I'm coming across, these days, is just downright pathetic......and unsafe. Can't even bend or ream conduit, some of these idiots....every bend has to be maufactured..and when it comes to circuit alterations they just couldn't care less, as long as it operates. Rubbish, believe me.