armour

  1. T

    Solution for earthing SWA cable whose armour strands have been cut too short

    Hey everyone, got a bit of a dilemma here, I installed an isolator in a meter cupboard, unfortunately, I really did not measure things up and trimmed the SWA steel strands a bit too short, an EICR was conducted and this was flagged up. I don't think I can get a gland in anymore so wondering if...
  2. R

    25mm swa armour for cpc

    Hi all, Just planning a sub main to an outbuilding . It will be 80 metre run, buried direct on a 63amp fuse . So I am thinking of running 25mm swa but just been doing my calcs on whether I can use armour as Cpc. The outbuilding is going to be TT so no need of a bonding conductor on the...
  3. holmestm

    Should the armour of an SWA carrying twin and earth cables also be earthed (with banjos etc)

    I have an existing installation extended in 2015. The existing cable had 3 cores and used the armour as earth, with connections soldered onto the SWA gland where required (e.g. in external sockets). At the point the extension was added the contractor took the armoured earth and connected it to...
    • holmestm
    • Thread
    • and earth armour cables carrying earth earthed regulations swa twin twin and earth
    • Replies: 10
    • Forum: DIY Electrical Advice
  4. MaintenanceSpark

    Earthing Armour with BS951 clamps?

    I was replacing a socket that had a cracked face and as I took said socket off I noticed the armour was earthed by using BS951 clamps. I wasn’t expecting to see any earthing of the armour as the SWA was in a conduit drop to the socket. I’ve never seen it done like that before but now I walk...
  5. G

    UK Steel Tape Armour and Reduced Neutrals

    Hi, someone has ordered Steel Tape Armoured cable instead of SWA. Can I use this armour as a CPC the same as SWA or not and if so is there a table so that I can check the figures. Secondly, correct me if I am wrong but 3ph with a reduced neutral should only be used on a balanced load ie a...
  6. mak

    Question about earthing the armour of SWA

    If cpc core is present i.e. it's either 5 core three phase or 3 core single phase — is a banjo connected with a brass screw into steel trunking adequate to earth the armour(provided trunking is earthed to the earth bar)? Or would you put fly leads in between then a fly lead to an earth bar? Thanks.
  7. R

    UK Class II enclosure + gland recommendation for divorcing SWA armour at TT outbuilding/shed?

    As the title says, I am looking for a recommendation for an enclosure and gland arrangement to electrically isolate or divorce the earth/armouring of a two core SWA supplying an outbuilding/shed. The supply to the property is overhead TT, so DNO provide phase and neutral only, a sub 20 ohm rod...
  8. Rockingit

    Tables for SWA armour cpc?

    In a former life on another forum as well as this one.... there were a whole heap of downloads that people had done as ready-reckoners for things like Cu eq for various armour sizes, R1R2 values on lengths.. useful stuff. I think I might even have generated some myself. Anyone have any...
  9. h.abrar94

    How to calculate the resistance of steel armour under fault conditions 70 oC for CSA 95mm2

    Hi All, hope your all well. I was hoping if I can please get some advice in regards to SWA. In Particular using SWA as CPC. Cable size 95mm2 I have a table for SWA which shows various information, in the last two columns it shows the "resistance of steel armour under fault conditions at 70...
  10. G

    2.5mm or 4mm SWA armour bonding

    Armour not CPC. By the letter of the regs 2.5mm is acceptable as the DB offers both mehanical and corrosion protection. Just seems a bit puny on a 10mm SWA, what about a much larger cable? Can some of the boffins explain why 2.5mm is deemed acceptable. Cheers
  11. Fitzy

    SWA outer armour not earthed at either end.

    A friend at work asked me to take a look at the electrics in his shed, RCD would occasionally trip out, turned out to be a very loose neutral going in to the RCD. One thing I did notice though was that the 10MM2 SWA entered through the back entry point of both the shed & house CU and neither...
  12. V

    SWA cable , TT, do i need an earth conductor in the cable?

    At the origin the installation is TT. Plan is to install a submain to a new db. Not carried out all the calcs yet, but my question is does the swa require an earth conductor in the cable. Basically planning on running a phase and neutral or perhaps even 2 x phases and neutral.(the cable will be...
  13. P

    High Zs on SWA Armour / New Earthing Conductor

    Hi all I am after some help/Advice if possible please A SWA sub main Distribution circuit has been given a Code 2 Rating on a recent EICR due to a high Zs of 2.8 ohms. The cable is 180 metres long and runs underground in ducting. The Install is from a few years ago when a new Substation was put...
  14. A032701

    How to connect SWA armour to 6mm Twin and Earth cable

    I have run 6mm t and e through the house from the db in the garage on a 32 amp mcb which is rcd protected. the 6 mm cable then goes into the back of an ip66 rated JB on the side of the house. i then intend to run 2 core (live and neutral) 6mm swa up to a workshop using the armour as earth. my...
    • A032701
    • Thread
    • 6mm and earth armour cable connect earth earthing how to swa twin twin and earth
    • Replies: 16
    • Forum: UK Electrical Forum
  15. B

    Swa armour feeding TT system

    I have installed a TT system at my garage, and it is fed via 10mm 2 core armoured cable, does the armour of the cable have to be earthed via the supply tncs side or can it be glanded and earthed the garage side (TT). Anyone know the regs ? Thanks
  16. W

    SWA Armour Use Descriptions

    Hi - various discussions we've had are summarised in this Voltimum information paper. Interesting for me was they effectively say main protective bonding in PME installations should be external to the cable, due to heating risk. I'm still digesting this myself ... The earthing functions that can...
  17. snipersmith87

    SWA cables - fly leading armour as cpc??

    Just after A bit of advice regarding a load of swa cables into dist board. What's people's preferred methods / good practice regarding banjos fly leads etc. Banjos inside?? If multiple cables are using armour as cpc is it considered bad practice to use 1 fly lead between the two Banjos??? Is it...
  18. C

    Testing ze with armour as earth

    Hello all, Quick bit of background, factory maintenance spark for 20+ years, covered some installation work over the years but not done a great deal of testing. New lines and cells are being installed over the next few months and all installation is being done in house. Decided it is time to...
  19. Sparky_marky2

    SWA armour supply to outbuilding, what CSA cable? and Reference Method?

    Hi guys, I am running a supply to an outbuilding that requires a 22m run from the Main CU (in the garage) to the CU in the outbuilding, at the Main CU it will be a 40A MCB supplying an 63ma RCD protected sub board which will then supply: 6A type B MCB for 12 downlights and an extractor fan 32A...
  20. H

    EICR Coding - Armour not glanded

    Doing EICR on a HMO, DB feeds a Consumer Unit in each room. The feeds to each consumer unit seem to be SWA however the armour is not visible/accessible at either the consumer unit or the DB - it seems to have been cut out behind the DB which is inaccessible. The cable is buried in the walls and...
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