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dno

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  1. S

    High EFLI on TN-S, DNO won't fix

    Hi all Firstly, I'm not an electrician but have found these forums extremely helpful reading over the last couple of weeks due to a running battle I've been having with UK Power Networks. Hoping some of the experts on here might be able to shed some light on the below... I recently arranged...
  2. stummish

    Final circuit & DNO cable in same trench

    Hi all bright sparks, I've had a question from a client I couldn't answer on the spot. I've done some google research but can't find an answer to this; Is there any reason the DNO cable and a final circuit be installed in the same trench? DNO cable will be in a duct, client wants the SWA...
  3. Adie moore

    do the DNO have a duty of care

    went to a house today, it was a tt system with no rcd protection anywhere. Ze was 143ohms, Zs on a socket ring was a bit better. mcbs were old bs 3871 push button conversations. thing is, the overhead supplying the house had been replaced about 4 years ago, nice new service head ripe for a PME...
  4. rolyberkin

    DNO response to request for isolator

    My customer calls the DNO today to ask for an isolator (he wants want to do things properly and is worried about a fuse pull as he has a smart meter!?) he gets passed from pillar to post, in the end gets through to a department who state that they will not fit an isolator but will come and pull...
  5. M

    DNO not interested.

    So found a mains cut out in a very bad way. Top of the fuse cover had snapped off and the fuse was not pushed in fully. Rang the DNO as was changing the consumer unit and explained the situation that it was dangerous as the fuse was exposed and you could put your fingers directly on the live...
  6. T

    Does DNO have to maintain/provide earth?

    Now in TT cases obviously not. Example, attended 50's type house. TNS looped through to next door. Nothing unusual there. Next doors earth is on this house's MET in 4 mm² and not the sheath of the incoming cable. Told DNO they said "We have no responsibility to supply an earth" In any event this...
  7. Smithy33

    Old DNO supply

    Hey guy's, Anyone ever been asked to price up a new db and found this as a main earth?
  8. V

    equipment in a dno meterbox

    Hi all can anyone tell me of there experience of fitting gear inside a dno meterbox....? ie a switch fuse for submain.. or switch fuse as required if your tails or submain to your consumer unit is more than 3m away from the cutout..? im aware that the dno's regs may say i cant fit gear in...
  9. L

    DNO maintenance on 11KV line

    Something that's always confused me and never been explained to me is when the DNO work on a 11KV line they clamp the 3 phases togeather and spike to ground. Then further down the line they do the same. This creates an alternative path for the electric to travel (through the ground) making the...
  10. UKMeterman

    Dno Hv Autorecloser Events Permitted Frequency

    Hi, I live out in the sticks, two independent HV Feeds from two separate primary substations with a pair of auto switches that control the single HV feed into the village. I have had 7 auto recloser events in the last 6 weeks, 3 of which in the last two weeks. At what point should UKPN get...
  11. B

    Type of DNO supply question

    I was installing a new control panel in a pumping station kiosk the other day. Sometimes I am required to `enter` the DNO supply to insert the earth cable on what is normally a TNCS system. To my surprise the supply was a single core with the armourings supplying the system earth but no neutral...
  12. R

    DNO upgrade 60 to 100amp

    Hi, Who is responsible for the cost of upgrading the supply to a property? The current fuse is 60amp, the property will need the 100amp upgrade. Sent from my SM-N910G using Tapatalk
  13. J

    Which is the DNO earth block? PME

    Hi All I would be interested to hear your opinions on this situation: It's a property which used to have the electricity meter in the middle of the house, the consumer unit is still there and there is still a cut out with a 100A fuse in it, a neutral earth block and a small label that says it...
  14. M

    New Supply from DNO

    Has anyone had dealings with ENWL regarding new supplies ? A customer has asked me to quote for splitting his house in 2 ( 2 20KVA single phase supplies ) and a new supply to his shop located on the same property ( 1 60KVA three Phase Supply ) ENWL have agreed to install a 100 KVA supply to a...
  15. A

    Ridiculous situation with the DNO and the MOP on a domestic install

    I have been trying to replace a CU on a domestic property. During my initial checks, there was no isolator and the earth was only 6mm on a TN-C-S. There is a label stuck to the cut out stating that it was PME. The cut out is a long brown Bakelite style with no access to the PME earth point...
  16. haptism

    DNO fuse 80amp, board dp 100amp

    Hi hope someone can help. If a small house's DNO's fuse is rated at 80amps, is it considered bad practice to fit a db with a 100amp dp switch ? As most db's have a 100amp switch I assume this is common practice, also I expect an 80 amp DNO fuse can handle alot more before it blows.
  17. N

    Nic Eic Assessment When Dno Haven't Been To Replace Earthing

    Hi All what a day ive had. ive just rewired a 2 bed house with TN-S arrangment. ive come to the testing and the ZE is reading 2.93 ohms. i installed new 16mm to the clamp that was originally on the incoming i cleaned up with the wire brush and tightened. still wouldnt bring it down. so ive...
  18. S

    Blown DNO fuse replacement.

    Being an electrician that provides a 24 hour emergency service I often come across blown DNO fuses. Currently I always call the DNO to carry out the replacement, but it would enable me to get customers back on supply much quicker if could legally replace the DNO fuse myself. Can anyone advise...
  19. H

    DNO Fuses etc

    I'm now reading "Student's Guide to the IET Wiring Regs" and it's pretty good. But I'm on the point of responsibility and such. It states that the service head fuse should only be removed by the DNO, which got me wondering what people do to isolate the supply when they replace a consumer unit...
  20. B

    DNO earthing arrangement

    A big Hi to all on here, please be gentle with me it my fist time !! It's only a quick one but do the DNO have a legal requirement to supply suitable earthing at the point of origin of metered supply. many thanks advance

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