Seperate earth cable?

[Tim 77]

If I were to pull in a run of 15M of 4 core (3ph + N) SWA would I need to run a seperate earth or would the armourings suffice?
Cheers, Tim.

 

[ricicle]

Depends on what size.

http://www.diynot.com/wiki/electrics:earthing_supply_types_and_bonding:swa_earthing

 

[securespark]

Should you be working on a commercial circuit without the requisite knowledge?

 

[Tim 77]

Should you be working on a commercial circuit without the requisite knowledge?

I work for a firm, just do as I'm told. I just wondered if an extra CPC was overkill or not.

 

[Tim 77]

Depends on what size.

http://www.diynot.com/wiki/electrics:earthing_supply_types_and_bonding:swa_earthing

Sorry, it's 6mm btw.

 

[Adam_151]

4 core XLPE meets the requirements of 54G for sizes upto 70mm² according to the chart I have, just keep your eye on ELFI though

 

[Tim 77]

Thanks Adam and Ricicle, your advice is much appreciated. Guess sometimes it's worth questioning what you're told to do!

 

[Adam_151]

Nowt wrong with an extra cpc though, though not strictly required unless its a marina (i'm lead to beleive)

I probably wouldn't do it with SWA, but I'd always choose to install a cpc in steel conduit, not keen on trusting it through loads of separate joins, etc (and it may be alright now, but who knows what happens in the future?)

OT: People tell me conduit used to have to be tested with a high current tester, but there seems to be no reference to it anywhere these days?

 

[RF Lighting]

I seem to remember hearing about high current testing for conduit / trunking, but I think it is fairly unusual to find a circuit not wired with its own CPC these days

 

[ricicle]

I seem to remember hearing about high current testing for conduit / trunking, but I think it is fairly unusual to find a circuit not wired with its own CPC these days

Yep, if you suspect any conduit/trunking joint then a high current test can be performed.....BUT you can't do it with the cables in as if there is any resistance then the I²R heating could cook the cables

You're better off running in seperate CPCs every time