underground

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  1. A

    Underground Rectangular chamber heat calculation

    Calculate the temperature rise in a system consisting of six conductors carrying 1500 amperes each at 132kV, insulated with XLPE, and spanning a cable length of 9 meters. The system is enclosed within a chamber with the following dimensions: length 10 meters, width 10 meters, depth 3000mm. The...
  2. hcanning2012

    Split Underground 12/2 UF cable between 2 sheds

    Hi, I'm running a 70ft underground UF cable in 3/4 inch PVC conduit to 2 sheds. The sheds are 3ft from each other. I'm just a DIYer enthusiast so learning. What's the best way to service both sheds with the 1 UF cable. Is there a T connection I can use or what's practical? I just need a...
  3. mothrat1980

    Ethernet and Power cable to be run underground

    Hi, I'm going to be wiring up my garden office with power and ethernet underground and I need advice on the best way to run the cables as I have read that you should not run power and ethernet in the same conduit, so the questions I have are: What sort of shielded conduit would you recommend for...
  4. HappyHippyDad

    Ideas for finding fault area in underground swa?

    Afternoon everyone.. During some testing I have found an IR reading of 0.01MΩ between N-E. This is on a length of SWA buried underground from the main consumer unit in the house to a garage consumer unit. The poor readings are not on the outgoing circuits in the garage. There must be a join...
  5. clanky

    UK Twinwall Underground Conduit/Ducting - Do Glands Exist?

    Hi All, Just started upgrading all my out building for power and data and i was wondering rather than cutting off the ducting at floor level, do glands exist so i can fit straight into the bottom of a suitable JB or Enclosure? Ive struggled to find any so any help appreciated. I have several...
  6. G

    Lightning strike on underground tank

    Hi all Strange question but I’m hoping someone may be able to help We have recently had a lightning strike very close to our home this is damaged all the TVs CCTV and Internet equipment this is not that however the problem also at the same time a rainwater harvesting tank (large plastic thank...
  7. A

    Earth Bonding - LPG Pipe That Does Not Go Underground

    Hi, Our cooker is LPG, fitted on the inside of an outside wall if that makes sense. The gas pipe runs internally then through the wall to the regulator and changeover unit mounted outside, around 4' off the ground. The pipe doesn't go underground at any point. My understanding is that it...
  8. UKMeterman

    Anyone want some genuine used London Underground high bay light fittings?

    Anyone want some genuine London Underground high bay light fittings, a snip at £150 each XL Station Lights - https://www.ltmuseumshop.co.uk/vintage-shop/shop-signs-and-railwayana/xl-station-lights
    • UKMeterman
    • Thread
    • anyone fittings genuine high bay light light fittings london underground used
    • Replies: 4
    • Forum: UK Electrical Forum
  9. G

    Help with damaged underground cables

    Hi, I'm looking for some advice. We are a garden irrigation company and I have an electrical background (up to 16th edition). We're carrying out an installation in a garden and have damaged 5 armoured cables (one a fibre optic) with our trenching machine. The cables in question were for a new...
  10. S

    Why does my underground pump trip the rcbo?

    I have a submersed bore pump 85M down and covered by 40M water. The motor/pump is 1.1HP, capacitor run, 35uF in a capacitor box above ground, with a three wire conductor and earth cable going to the pump. The water is pumped up into a tank at ground level. There is a pressure switch at the...
  11. SolarCity

    Specialist firm for running cables in underground?

    As the title says, I wonder if anyone has any knowledge of specialists firm who run in armoured cables underground? I have a 250m run of two cables, possibly around 4core 150mm across a field that I'm looking at. I wouldn't even know where to start in pricing something like this so I'd like to...
  12. C

    Old MICC cable underground to garage, extraneous conductive parts

    Ok so the scenario is there is an old MICC or pyro 1.5mm 2 core cable supplying the garage run underground on a 16A circuit breaker that is RCD protected. In the garage there is a water pipe fed from the house, at the house it is bonded using 10mm, at the garage bonded with 6mm. I think the...
  13. C

    What type and size of cable for a long underground run

    Hi there, I have a customer (I'm in IT, not an electrician, and am just getting information at this stage before appointing a contractor early next year) who is planning on having fibre and a switch in a couple of fields for events. We will be providing an IP65 cabinet with mains power, a fibre...
  14. V

    Singles in conduit underground - Any reason why not ?

    I've been called in to complete a job started by someone else and I just wanted to ask the following: Basically it's to provide power to a garage and then on to provide power to a Summer House. What has been done already is a PVC conduit has been buried under the patio between the main house...
  15. J

    Making 10/2 w/o Ground Pole Barn Subpanel Safer

    We have recently purchased a home in TX built in the 1920s, and the wiring is an assortment of multiple wiring events. There aren't any local codes as it is unincorporated land. The events in question are with the overhead wiring to the pole barn subpanel consisting of two 10 gauge solid-core...
  16. Retroelectric

    Underground swa joint.

    Hi all. Had to repair a underground swa cable at short notice this afternoon so just had what was on my van as wholesalers would be shut. To get it back going I used some outdoor gland packs and crimped it in a whiska box. It’s due to be replaced apparently but how good would that connection be...
  17. T

    How to deal with issue in underground wiring?

    Hi, I've got an external extension that was installed before I own the house. It runs to an outside socket, and then underground for 50 feet or so to an outbuilding. Over this winter the RCD for this circuit has started tripping. With a bit of DIY disconnecting of things, I've determined the...
  18. T

    How deep for underground wire?

    I am planning to trench for a 50 amp. generator line from garage to the house. I will be using #6 THHN in 3/4" PVC conduit. The run will be 125 feet. Please advise how deep this should be buried. I have read conflicting numbers. Thanks.
  19. G

    Meter and Service Disconnect at Road - What Wires to use underground to connect main panel in house?

    I have 200amp connection, with the meter and service disconnect at the road (see pictures). House panel is about 75 feet from the service disconnect at the road. 1) Assuming I need 4/0-4/0-4/0-2/0 AL wire sizes (considered a sub panel), exactly what type of wires are required to run from the...
    • gz068z
    • Thread
    • connect disconnect house main meter panel road screwfix service underground wires
    • Replies: 1
    • Forum: UK Electrical Forum
  20. K

    old underground wires ?

    I have an outlet outdoor, supported straight up by a galvanized pipe. It has only black and white wires, no ground. The galvanized pipe is extremely rusted and breaks exposing wires inside the pipe !!! On top of that, it has no electricity either. Please note my home is ~40 yrs old. I tracked it...
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