regs on earthing SWA | Page 2 | on ElectriciansForums

Discuss regs on earthing SWA in the Australia area at ElectriciansForums.net

J

james king

can any one show me a regulation that the SWA stel outcore has to be earthed. i understand if its to a metal box ect. but plastic?
 
yes i know it can be used supple a earth. but if the is no need to use the armour as a erath because there is aready a core used for this. what regulation does it come under if its not earth at a plastic box, i have seen lots of these and no amour was earthed

only when metal boxs are used?

I use SWA cable for the additional mechanical protection it provides and always connect the supply side to the MET. If the armour is not being used as a cpc then there is no need to terminate the steel armour to the cpc of the load side, but generally I would.

If you are installing cable that doesn't need the extra mechanical protection and is routed through areas that won't see any abuse then use a different cable - flat twin and earth will be a lot cheaper to buy.
 
Expecting the comment that glasgowbiker42 came up with, was why I put extraneous, however, it is part of the electrical installation.
Also I bet if you read the manuf' instructions then they will stipulate earthing of the armour at one end at least, as you could be using it to supply a sub main to a TT system, where you could drop the armour earth at the consuming end.
If you are using SWA then it is probably in a location where the cable requires protection by an earthed armour or sheath, thus to meet that requirement, the armour must be earthed.
Apart from dropping the earth for a TT "consumer" side, or possible earth loops causing noise in particular installations then IMHO the armour should be connected to the cpc in the cable at both ends.
 
the bit of the gland inside the enclosure is exposed and electrically connected to the armour.also, if somebody pulls the condom down it's all exposed.
 
Well you could put it like this , you earth an appliance ,fridge , washing machine iron etc etc etc if there is a fault it goes to earth and trips the breaker , as has been said by the other posts its protecting the cable , with this it is a JIC basis if some one cuts it in half with a spade cuts through it with a saw , sticks a forl through it , the first part any of the above hits is the earthed armour this will then cause fault conditions short circuit and then trip the protective device , if the armour is not earthed then for example a fork penitrates the armour and then clips the live conductor then the armour and the fork will be come live and may not cause the protective device to operate .as for the regulation number i agree with malcome it could also come under 522 external influences depending how you interperate the regulations
 
I thought CW glands were just water tight, and that the brass of the gland would still be conductive?
That aside, I would have thought that Regulations 133.1.2 Every item of equipment shall comply with the appropriate British Standard.....
And 134.1.1 Good workmanship by competent persons or persons under their supervision and proper materials shall be used in the erection of the electrical installation. Electrical equipment shall be installed in accordance with the instructions provided by the manufacturer of the equipment.
I am under the impression, that to meet the British Standard, the armour has to be earthed, and that it is also in the manufacturer's instructions that it be earthed?
 
sorry malcolm i think you'll find it actually has 3 as an example xlpe/swa/lsoh ?


inner cores have a lsf covering individual cores then a covering of xlpe then the swa followed by the outer lsoh sheath.

Oh and by the way i would always earth an armoured cable as a minimum at one end if the swa is not utilised as the bonding conductor. It's called good practice and the brass gland would be covered by the shroud!

I'm only debating the original post:biggrin5:
 

Reply to regs on earthing SWA in the Australia area at ElectriciansForums.net

News and Offers from Sponsors

  • Article
Join us at electronica 2024 in Munich! Since 1964, electronica has been the premier event for technology enthusiasts and industry professionals...
    • Like
Replies
0
Views
321
  • Sticky
  • Article
Good to know thanks, one can never have enough places to source parts from!
Replies
4
Views
848
  • Article
OFFICIAL SPONSORS These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then...
Replies
0
Views
971

Similar threads

  • Question
All the lamp post cutouts I've ever seen have a twin swa gland plate built in to the base.
Replies
2
Views
640
loz2754
L
Sounds more positive.
Replies
8
Views
619

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top