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albi

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Arms
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We all know that armed cables should be bonded but I have inherited a job of a so called electrical contractor. My problem is he as ran 2 core 16mm SWA to 3 flats with a separate 16mm earth but the SWA has not been glanded off, and it’s a finished job.
I can not pull out and start over so does any one know of any other way to earth the armouring without glanding off. Please no Tenby earth straps
 
G

Guest123

Hi.

In short no. To effectively earth the armourings glanding off is the only way. Are the armoureds surface run or hidden in walls?? Could you not install a metal adaptable box above/below the CU and gland into that?? contiunuing the cores through and earthing the armoudes that way??
 
D

daver

Not entirely sure, but I think he has covered bases with the use of a seperate CPC. Table 54.7 quotes that if csa of phase is 16mm or greater, then the CPC must be the same CSA. By running a separate he is complying.

It is not an exposed part as it is sheathed.

I stand to be corrected (not shot down).

Dave
 
this is not my recomendation they do need glanding, but if you are in a muddle you could strip some outer off to expose the armour, you could solder a fly lead on each end and terminate it that way (rough though)
 

benji

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Arms
albi you know theres only one way ,isolate the cable and gland them your only talking 1/2 hour downtime for each cable
yours benji
 
Luckily as it's not the circuits cpc only one end needs bonding, so as markspark666 suggests you could strip the outer sheath then pull the strands to one side, trim them to the same length and find a crimp lug that's a good fit.

It won't look very smart but perhaps you could find something to overwrap the whole thing.
Richard.
 

benji

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Arms
albi is there any reason why you can,t isolate i know it could inconvienence the client but it seems like it,s not your fault,and lets face it both you and the client want a good job done
yours benji
 

albi

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Arms
  • Thread Starter Thread Starter
  • #8
If it was only that easy I would not off been asking the question but no the SWA is all behind plastered wall (finished) and about 20mm showing. As I am only issuing a periodic for the job to building control it will have to go down as a departure.
My fist thoughts where to go down the lines of what is used in the jointing kits i.e. sprung steel and earth brads any thoughts on that as i only need to protect the SWA from any impac(nails/screws)
 

benji

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Arms
when i first used the coiled spring clamps i thought they were **** but changed my opinion as the do get a good hold and visualy they would look better than a tenby ,but you would have to use an earth braid and could you term the braid into the earth bar in the cu.
is the cable plastered into the wall and if so is it protected in any way
yours benji
 
Last edited by a moderator:

albi

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Arms
  • Thread Starter Thread Starter
  • #11
yes its plasterd in with no protection apart fron the 80amp fuse at the fused isolater at the meter end this is my consern as i only need to earth the SWA not the final cu as this is coverd by the sepoarate 16mm earth wire
 
P

platty1005

See BS7671 522.6.6 (i) Incorporate an EARTHED Metallic covering etc etc cables complying with BS5467 SWA
So armouring must be earthed even if not being used as a CPC
Reg 134.1.1 Good workmanship by competent persons ..... proper materials.........Equipment shall be installed in accordance with the instructions provided by the manufacturer....
The cable should be properly terminated in accordance with manufacturer instructions = GLANDED both ends and SWA earthed as should any other exposed conductive part.
I suggest you dig it out and do it properly if thats part of the contract otherwise report it on the PIR as an observation and recommend cable is correctly terminated
 
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