swa

swa

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  1. T

    SWA Cable on campsite fence

    Removed a rotting picket type fence on our campsite which supported 4 electrical 10 amp hook ups and replaced with new fence. As the new fence has different post spacings the previously installed SWA cable is either to long or worse to short. As the cable is above ground and running along the...
  2. 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...
  3. L

    Size of earthing lead for 10mm 3 core SWA

    I am installing 3 core SWA using a piranha nut. What size of earthing lead to connect the piranha nut to earth terminal do I need? Does it also need to be 10mm or I can get away with 6mm?
  4. D

    SWA used to feed DC motor armature

    Hi, Is it permitted to use 2-cores of a 4-core swa cable for DC+ and the other 2-cores for DC- for motor armature, the field being fed by a separate cable? Thanks Dave
  5. HappyHippyDad

    Does SWA need RCD on a TT?

    I know the answer, at least I think I do as I am now questioning myself! It's just I've seen a few jobs recently where the electrician (or who ever did the job) did not give any fault protection to the armoured cable, so I am wondering if I am missing something? The most recent example from...
  6. S

    UK Is the main fuse head satisfactory protection for SWA supply cable?

    Commercial/Industrial installation. Summary of installation: Main feeder pillar contains TNCS incoming supply single phase 100A main fuse, 25mm DNO tails, meter, 100A double pole isolator switch, 25mm tails/16mm CPC to 63A rotary isolator, 10mm SWA cable 25m run to digital advertising panel...
  7. D

    UK Swa as main earth ?!?

    So I have turned up on a job… someone previously has installed a 120mm 2 core swa from the meter to a barn building 160m away and them split off for the house and barn building in 25mm tails and have used the armour on the swa as the main earth. Both ends of the swa have been terminated badly...
  8. 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...
  9. T

    SWA cable Terminating or not??

    Had a discussion with my electrician today about upgrading the SWA mains cable fed from my house to my garage as im looking to use the garage for some woodworking machines, eg table saw, planer as well as some sockets and lights. Sparky has informed me that there is currently a 3 core 6mm SWA...
  10. S

    Electric range and hob SWA, T&E x 2, or Q&E?

    Electric hob/oven range was installed years ago, runs on 2 x B32 MCBs to 'House' (sub)consumer panel, runs to oven on 2 x T&E. Kitchen is being remodelled. Would like to run cable direct from range to 'Plant Room' (main)consumer panel. Need advice on cable purchase please. 1 x SWA with 4...
  11. P

    Earthing SWA at lampposts with plastic fuse enclosures ?

    Hi All, Just finished testing lamp post supplies pre LED upgrade for a company where the measured Zs exceeds maximum permitted on all circuits. DB change is in the pipeline but brings its own issues with inrush current and what type of MCB to utilise due to the poor Zs readings. Current earth...
  12. J

    Is it possible to put a 16mm swa on a 40a mcb protected by an rcd

    Is it possible to put a 16mm swa on a 40a mcb protected by an rcd
  13. sythai

    Been struggling a bit today! Cat5e SWA

    Hi Guys After bit of advice please as we don't do much data normally, tend to sub it out. Had garden building this week which we'd run in SWA cat5e in and decided to terminate and test ourselves. Put a click RJ45 socket at each end and tests failed, tried with hager RJ45 and same issues. On...
  14. C

    Best method to calculate 4 core SWA current rating for two pairs of 1PH line conductors

    Hi, I have a Victron Multiplus-II 5kVA inverter/charger with Pylontech US5000 batteries installed in my house along with a 6.8kWp PV array and associated charge controllers. This installation has full DNO G99 approval and was installed to BS7671 and has been running great for about 18 months...
  15. Brownie91

    Is RCD protection required on SWA supply cable to EV?

    Hi all, I am at odds on whether RCD protection is required on an SWA of 14 metres, clipped direct under flooring direct from CU to an exterior Tesla EV charger. The Tesla charger is three phase and to be a 22kw supply at 32A. TESLA SPEC: The wall charger itself features a built in RCD Type A...
  16. S

    Insulation test L to E long length of SWA

    Insulation test live to earth = 0.7 ohms. This is a long length of buried swa cable (approx 100m) from mains in to submain. Test done with live and earth disconected at main and with switch off at sub main. Question - is this an accurate reading or am I misding something. Its a big job to...
  17. S

    UK Amtech/Trimble - Excessive Earth Loop Impedance on SWA cables

    Hi All, I'm new to Amtech/Trimble and I've been asked to review a model. I'm looking at circuits that are SWA cables using the armour and an internal conductor as the CPC. There are various earth loop impedance errors listed where the Zs at the load end is too high, but what I can tell, Amtech...
  18. lozarus

    Interesting SWA Cable

    Was having a poke around the old man's house today. Anyway. DB is under stairs (18th ed following a recent extension. Not done by me but it's done well.) There's a submain in 2 core SWA feeding an old 2 way Wylex in the detached garage (lights and a socket radial). Entire sub is fed from a 16a...
  19. R

    Cottage supplied by 16mm SWA 300+ yards! Trying to resolve a high Ze reading

    Hi, while carrying out an EICR at a farm cottage on Friday i came up against a problem early on. Whilst measuring the Ze the reading i obtained was 0.97 Ohms and 27Amps Pfc. Now the earthing system itself is quite strange. Next to the consumer unit is an old service head holding a 60A BS 88...
  20. T

    Can SWA be run in the same metal trunking as singles?

    I have checked the regs and can't find anything to say this can't be done. Although I'm worried about cable movement in the case of short circuit damaging singles in the trunking

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