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underground

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  1. L

    Underground HV cable & Communication separation distance

    Hi, Is anyone can suggest me, what is the separation distance between underground HV cable and Communication cable? An existing communication duct is found across the new HV cable route whilst new trench is dug for HV cable laying. Is there any reference or literature that mention about the...
  2. L

    Underground Cable Testing

    What test is to be conducted prior termination of 11 kV HV cable?
  3. Pete999

    The Underground

    Sorry Folks. I visited IFSEC today, and during the Tube ride from Stanmoore to IFSEC. I was gazing out of the window looking at the scenery (that's my excuse), I couldn't help but notice what looked like coils of MICC at points along the track, all cable tied to what looked like specifically...
  4. L

    Minimum separation distance between LV underground cable and Water service

    Hi, I have noticed the following item in a new construction site. Could anyone can give me further suggestion, please. 1. What is the minimum separation distance between LV underground cable and water pipes (Cold water)? This is for new underground cable lying. Water pipe is to run parallel...
  5. D

    Underground electrical service ducting / containment : colour coding?

    Evening all, Could someone advise if there is a regulation/guidance note that defines colour coding of underground ducting / containment for electrical services, I assume the 'accepted' colours of yellow -gas, blue - water and black - electrical are standardised but I could not see where this...
  6. Pete999

    PVC,PVC joined to SWA in an underground joint

    Went to look at at a job with a mate of mine who is a Sparky, it's in a Farm house more to the point it's in the Garden. The owner has two garden offices an old one being demolished at a later date I'll call that shed 1 and next to it is his new shed called shed2, get the picture? He has had...
  7. S

    Underground twin wall ducting

    Hi guys, just looking for a bit of advice on what to use. As I work in new build commercial work, trenches and ducting is installed by grounds workers so usually just pull through what they installed and to services hatches ect. however what I'm wanting to do it lay 2 X 50mm ish twin wall...
  8. H

    underground cable joint

    for reducing ac resistance in EHV milliken type cable, the strands should insulated by using enameled strands. I want to install underground large cross section milliken type cable with individually insulated strand. I don`t know what accessories i need to remove enameled coating from each...
  9. A

    Underground Cable

    Hi Guys, I have a question, a friend has asked me to check out something for him (I wish I never said yes). On arrival he shows me the garage and asks me to check if its safe (he's about to sell his house). I find that he has 4 twin sockets and 4 5ft 58W lights all fed from 4.0mm flex coming...
  10. J

    Pipes for carrying electrical cables underground dimensions?

    Hey, I'm doing a project and I was wondering what is the largest diameter pipe commonly used to carry electricity wires/ phone lines etc. is?
  11. HappyHippyDad

    A few questions on laying underground cable?

    Afternoon all.. I am about to lay approx 30m's of 3 core 2.5mm of SWA (with approx x2 45degree bends and x2 (gentle) 90degree bends where it will protrude, and perhaps 10m of 19 core 2.5mm swa with x2 (gentle) 90 degree bends. These are going in separate trenches. I realise there is no...
  12. spud1

    Underground CCTV cable

    Hi I have to run an underground cable approximately 325m from an office to an end of drive gate. The cable needs to have provision for CCTV, Voice and gate unlocking access control. Can I have some opinions on the best cable to use? I was thinking underground, armoured CAT 5 or CAT 6 but can...
  13. C

    what sequence to install Trefoil cables underground

    We are to install 2 x 630mm single XLPE CU cables per phase + 1 x 630mm for the neutral can anyone lay their hands on the what sequence to install Trefoil cables direct underground as a official PDF please as we are having a debate at work and its been years since I had to do this. I think its...
  14. S

    Underground SWA Cable

    A new supply has been installed by SSE and its a single phase TN-C-S in other words neutral and Earth combined at the cutout or point of supply. Meter tails have been installed to a distribution board which feeds one circuit. From that distribution board we need to run a SWA conductor from an...
  15. P

    underground cable

    Can anyone give me a good Idea how cable rating factors are worked out do we use table 4b2 and 4b3 please help and exsample would be brilliant
  16. M

    Underground Cable Route to device which needs TT-ing

    Hi guys, I have a bit of a quandary about an installation I have coming up; I need to install a 100kW rated Electric Vehicle charging station in the middle of a car park. The supply (PME) will be in a toilet block building approximately 45m from the final location of the charger. There will be...
  17. P

    Pyro Underground!?

    Hi Guys. Doing a CU change. Found a supply to the swimming pool pump shed done in orange Pyro. The cable is clipped along the outside of the house and then disappears underground reappearing in the shed. I know nothing about Pyro. 1. Is it allowable to use it this way (instead of armoured)...
  18. M

    Repeated underground cable fault

    Having worked in America with their weird systems,thought I'd seen it all,but this has got me puzzled,a rep[eated failure of a cable at 33kV supplying a house and dairy,the cable of a type used by Country Energy,is rated for 132kV,400A per phase,supplying a 433-250 400kvA transformer.The cable...
  19. R

    Installation of recessed uplighter in driveway

    Anyone every installed uplighters in tarmaced driveway ,great idea but terrible to install ...iv been presented with some uplighters but the design is rubbish ! They have 40mm space before it hits the ground .... Meaning that an underground joint must be made if useing swa cabling ,im driven...
  20. J

    Underground SWA Advice

    Hi All, I'd like some thoughts on the cable size to an outbuilding on a large-ish domestic dwelling, pls. Scenario: Three outbuildings to this property all have separate cu's running t+e socket and lighting circuits. Building 1 has SWA from an MCB on its cu to feed building 2's cu and then...

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