dno

dno

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  1. Gutsy-Fungus

    Electricity DNO Supply installation outdated and UNSAFE?

    Hi folks, Moving into my new property in a couple of weeks to find a concerning electrical installation in the cubby hole underneath ther stairs. I have attached a couple of pictures of the installation. Does this main feed from the DNO (#3) look safe (left hand picture)? It is corroded and...
  2. S

    UK High Ze TNS - what to expect from DNO?

    Clueless householder here! My wife told me John Lewis refused to plug in our new oven this morning due to "high readings on sockets". It looks on their paperwork like the "Pre Earth Loop Impedance Test" failed with 2.02 Ohms. I thought that was strange as we had a new consumer unit fitted and...
  3. G

    Notify DNO of air conditioner installation

    Question has been raised about whether we notify DNO of air conditioner installation. NICEIC registered electrician doing the installation certificate says these Daikin 14kw units might be classed as heat pumps. we have never notified before, so are asking for anyone who has experienced this...
  4. Yellowhammer

    DNO question

    Hi all, Easy enough and possibly very silly question. when moving a supply, if there are 2 sets of 25mm tails in the meter box (one to the CU for the house, second set to a 63A switch fuse supplying an annexe, will the DNO terminate both sets happily enough? Thanks,
  5. timhoward

    High Ze, should I argue with DNO

    On an EICR I found a 200 amp 3ph supply, TNS earthing (which looks original) and Ze of 19 ohms. No rods. No RCDs. L1 -> N was about 0.5 ohms. Other phases were similar. So I reported this Ze to DNO. According to customers, they came out the next day, confirmed my reading, but said there was...
  6. kropaske

    Who's equipment is this: BNO or DNO

    So this is 1st floor maisonnette with concrete floor, 16mm2 single insulated tails coming from dual cut out on ground floor, through steel conduit, which is used as earth with some old clamps and bare wires. Tails terminates in another cutout as per pics and then arrangement is as usual. System...
  7. L

    DNO fitted New Incomer etc . How long can we expect for supplier to fit new meter etc . ?

    DNO ripped out antique main incomer/breaker .The guy hated us and himself and everyone else by the end of the job ! . Client going to contact supplier and ask for new meter .Old consumer is beyond dangerous .So whole flat will be rewired etc .I just want to strap in a DP isolator and "garage...
  8. A

    Meter installer won't work on my supply

    Hi all -- full disclosure I am a 'DIY-er' but wanted to post here for greater visibility seeing as I certainly won't be doing this work myself... I'm in the early stages of getting my house rewired (estimates) and during one initial visit, the electrician pointed out that I would need a way to...
  9. S

    Electric boilers and DNO notification

    My company has recently done some air source heatpumps which require DNO notification and EV chargers which also require DNO notification. On an EICR today came across a 14.4kW electric boiler on a 60A supply (installed last year by others). Apart from the obvious issues I looked into whether...
  10. timhoward

    Old service head, refer to DNO or not?

    I've got a job in a tucked away property that has an old Lucy Oxford service head. It's been a while since I've come across one. Am I remembering right that the DNO's are generally interested at looking at and changing these? Thanks.
  11. S

    UK DNO Concentric cable current carrying capacity

    Had UKPN come out to a property recently to upgrade the main fuse from 60A to 100A but when they arrived they said that the supply cable which he confirmed is a 25sq.mm. CNE aluminium concentric cable (1-phase, burried) for the PME supply is only able to take a 80A fuse. They will have to dig...
  12. I

    High incoming supply voltage EV charger shutting down

    Hello, I have a EV charger that is reporting over voltage and is unable to charge. the charger will operate up to 253V The solar inverter reports voltages below 253V and when the solar is shutdown and isolated the incoming supply reports voltages in excess 248V consistently, peaking at 256V...
  13. S

    Dno incoming tails too small?

    I've come across this incomer, looks like 10mm conductors. The dno has upgraded the meter and used a 100A fuse. So my question is, does this need reported or can I do whatever work I please along as I don't overload the 100A fuse 🤔
  14. Nicky Pies

    Solar Panels Installer mishap or dno mistake?

    Hi everyone, looking for some advice or knowledge on DNO approval. I’ve gone to sign up for export with Octopus. On the application form they’ve asked for MCS number (supplied) and also a letter to DNO however the Installer it appears to have forgotten to do something as they can’t get it and...
  15. E

    DNO applications specialists

    Good morning, can anyone offer any advice on DNO applications? We've recently had an enquiry regarding a 75kw PV installation and would be interested to find somebody who could advise on DNO applications in this case I believe the application would be a G99. Are their specialists out there who...
  16. S

    Notifying DNO for first EV install

    Hi, So I plan on installing my first EV charger soon. What's the usual route. Do I notify the DNO and sit and wait for approval or is there a shortcut? What are most electricians doing? I've met a couple who are claiming to be 'banging out' EV chargers but that doesn't really chime well with...
  17. Risteard

    Welding equipment - DNO permission?

    Does anyone know whether it's still the case that if a customer wishes to have a supply installed for a welder in their home that they need specific permission from the DNO? Struggling to find an answer on Google.
  18. J

    Dangerous DNO Head - Lucy Oxford

    Just a FYI. I called out UKPN this week to request a supply head inspection before a complete upgrade of their domestic installation. It turns out that following a nasty incident with one of these Lucy Oxford supply heads, UKPN will no longer even open them. Instead, UKPN is going to dig up the...
  19. O

    DNO cable to head flopping around next to a bed

    I found this in a property today, I've never seen the incoming cable to the head (above and the other side of this wall) just dangling in free space before, in a bedroom. It's normally in a wall cavity right? Boss said note it on the MWEIC, would you guys feel you had too notify someone?
  20. N

    25 ohms Zdb + same reading for all circuits

    Hi everyone, I have a particular job visited this morning, that on all circuits, at each point, i got a reading off around 25ohms for a earth fault loop impedance test(zs). I then thought to do the same at the DB for those circuits. Again, same reading was obtained. I then turned off the...

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