armour | Page 3

armour

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  1. B

    steel wire armour as an earth?

    Hi another quick question please, Can you use the steel wired armouring on a 16mm 4 core cable as an earth?, as I think I have read somewhere that you can only do it but only up to 10mm sq. Thx Bigfoots
  2. C

    Is RCD needed at both ends of armour feed to outbuilding

    Hi - first post. I am going to carry out a sub main installation from a main CU in the house, to a garage, (15m from main CU to garage sub board). The CU in the house has no RCD protection. The garage will have a local TT, and the sub board will have 30mA RCD as main switch. The SWA cable...
  3. S

    SWA Testing cpc continuity!

    Hello just wondering if anyone could help me! I have to test a circuit tomorrow wired in SWA that is using its armoring as its earth, To carry out the R1+R2 test how would i eliminate any parallel paths? Surely the only real way to do this would be to remove the cable from the side of the metal...
  4. B

    sizing SWA armour as cpc using adiabatic......

    I'm doing a mod for a 3 phase circuit already installed. The only trouble is I can't work out why the existing cables are as they are so i am doubting my sums. Existing final circuit. 3 pole memshield 2, D32 rated feeding 10mm2 4 core swa with a seperate 16mm2 G/Y as cpc. Measurements at the DB...
  5. keniff

    3 phase

    What's the norm on a 3 phase Submain in regards to swa and earthing, I'm looking at 25mm swa but not keen on using the armour as earth, (it works out ok size wise) I normally use an extra core for earth on single phase but 5 core swa seems a bit thin on the ground anyone have fors and againsts...
  6. D

    SWA Armour

    Hi Ive got to run in some SWA cables for some large bits of equipment. Its TP&N, is there any issues with using 4 core and using the armour for the earth (ensuring the Zs is ok)?
  7. P

    Circuit design - SWA R1+R2

    Hi all This has got me thinking. I am designing a circuit using 3 core 2.5mm SWA and using table 11 in the OSG on page 182. With an R1 of 2.5mm and the same for R2 I know what the milli ohms per metre is. That's all well and good but I also know from experience that when uisng the armour as an...
  8. G

    Earth Cable To Sub Distribution Board.

    Hi All, I recently installed a new dist. board with 95mm sq 4 core swa cable. I used 35mm sq earthing cable even though I should have used roughly half the size of the live conductor. I used this because I had it, and was hoping it will be ok. I now fear that the cross section of the cpc...
  9. C

    Bonding to SWA armour - not able to gland

    Hi all, Been to look at a job in a chalet. Nice shiny 16mm earth from the CU to an earth terminal, sh**e 4mm oxidized to f*** from the terminal to the armour of the incoming, looped to the 'loop out' SWA going onto the next chalet (sorry, didn't take a photo). Anyway, the site owner has said...
  10. keniff

    Swa armour earthing

    Can anyone point me in the right direction as to find the size of conductor to earth the armour of swa? It's not being used as the cpc on the circuit it's 25mm 3core. I'm always trying to find this when I'm terminating armoured cable!! Thanks
  11. S

    Earthing to armour of SWA

    Seen it quite often where the armour of SWA is not earthed, at all, just removed and cores used as live, neutral and earth. IMHO this is completely wrong for the first installation (what were they thinking??) and should be rectified urgently if found on an EICR ie code C1/2. What do you guys...
  12. R

    Using SWA Armour & Core in PME TNCS?

    Hi guys , was wondering if any could advise. Got a job when client is moving his shed containing Swin pool pump filter etc etc a few metres. I have disconnected for him and made safe. Unfortunately though he thought he could just bish bosh in himself but advised that would be a notifiable and...
  13. S

    R1+r2 values for steel wired armour

    Hi all can anyone tell me where the values for r1+r2 for swa are in the regs or onsite guide, can't find them, thanks chris
  14. P

    Unearthed armour?

    Spotted a couple of nasties on a solar PV installation yesterday. 1. Single insulated cables (4sqmm twin and earth stripped back) connected to the generation meter (obviously designed to take 25sqmm tails). Yuk! 2. They'd installed an SWA cable from the PV isolator to the isolator at the...
  15. L

    Help with calculating the armour of SWA as a CPC

    Hiya guys. I am learning about earthing, bonding and cpc’s at the moment, and I am getting a bit stuck with using the armour of SWA as a CPC. Iwonder if anybody would mind helping me by reading this, and correct what I have got wrong so I can make sure I understand it properly. If I had a 2...
  16. S

    Use of SWA armour as protective bonding conductor?

    Hi folks, attempting to fix a screw up by previous installer. TN-C-S domestic property with garage outbuilding. MET is in consumer unit in main house; garage distribution circuit protected by RCBO. Garage sub board populated with MCBs. Cable to garage is 6mm2 SWA 3 core. Garage has extraneous...
  17. P

    How to calaculate the csa of the armour of a SWA cable

    When calcualting the minimum csa for a cpc using the adiabatic equation, how can you work out the csa of the armour of an SWA cable in relation to the amount of fault current it can carry?
  18. the pict

    out buildings

    This has been rattling around in my head for some time, I have read the guide in the sticky section about exporting etc,so a building outside the equipotential zone should not have the earth exported, right ?, and a spike (s) should be used, but, what about the armour this should be terminated...
  19. B

    Swa armour earthing

    Does the steel wire armour have to be earthed in ALL cases?
  20. Goody

    Earthing metallic armour of SWA cable.

    I have connected the metallic armour of a 1 .5mm SWA cable (about 50ft run) to the met on the main CU using a 10mm earth cable. Is this a bit of an overkill or should I use 6mm earth cable instead? What calculation applies to determine the cross section of the earth cable in this case? Cheers!

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