main fuse

  1. A

    Diversity on a 20 Way or longer CU with many (low utilisation) ring mains

    Hello, A quick question which I suspect is becoming more commonly asked as we go towards having more ways in our CUs. Domestic dwelling, nothing too exuberent but during rejigging the large downstairs ring was split into three and some radials added, as well as seperate feeds to allow for a...
  2. 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...
  3. B

    Maximum demand exceeding main fuse.

    I've got a customer who currently has a 60A main fuse running in 10mm tails to a board with breakers 32/32/20/6/6A which, doing the diversity calc at biggest breaker + 40% of the rest comes in at 57.6A, just about OK. She wants a new 32A cooker circuit, so I said she should get the tails...
  4. I

    Is the main fuse big enough?

    Hello Shop with a 100A main fuse LED lights few amps max, cash tills, cash machine, roller shutter, auto door, nothing pulling much power but there are 5 motors totalling 80.5A FLA Realistically what sort of power would this site be pulling constantly? Slightly conecerned that it may be...
  5. R

    What does the main fuse protect?

    From another thread: I'm thinking about this and it's got me all confuzzled. Don't fuses protect anything downstream ie my laptop's charger has a fuse that protects the charger cable, the socket has a breaker that protects its wiring, the boards wiring has a main fuse that protects it from...
  6. D

    Main fuse box problem

    Hi Everyone, I have a faulty smart meter, its broken since I moved in and I am putting all my effort to fix this, I am a tenant though. A technician from the supplier visited the property, inspected the meter and he said that he needs to access to main fuse box to replace the meter. We have...
  7. T

    Identifying / dating old service head?

    Hello, we're looking at relocating the CU fairly urgently for a small business (retail shop) and came across this service head. Obviously need to safely isolate ahead of working on the CU but not come across this type before. We're assuming the cut out is probably at least 50 or 60 years old...
  8. P

    UK Main fuse bunched with other houses

    Hi, wondered if anyone can help… just bought a new house and it has an alleyway between next door, in which I have found one main supply which branches off to 4 separate main fuses for mine and 3 other houses. So it appears the side of my house has the fantastic benefit of managing the...
  9. M

    UK Smart meter installation possible - main fuse?

    Hi, I have a flat in a rather old building in London. Its subdivided into a few individual flats, and there is a meter board with a gas and electric meter in each flat. My electricity supplier sent someone out a few days ago to fit a smart meter, but the fitter said he was unable to do so...
  10. G

    Main fuse re-locating from house to garage, what cable to take supply back into house

    Firstly, just to re-assure professionals here, all tie-in and testing on this project will be undertaken by a qualified electrician. This post is just to improve my understanding. We are preparing to have solar and wind power generation facilities at our home and the first phase of this is to...
  11. V

    Next door neighbour mains spurred, pre-meter off my main fuse!

    Semi-detached next door house mains supplied from my property pre-meter off main fuse. I cannot get a smart meter as main fuse cannot be pulled by non DNO electrician. This arrangement has been confirmed as not a revenue dodge (ie running feed to garden shed, extension etc). We confirmed the...
  12. B

    Main fuse blows before MCB.

    I wonder if anyone can suggest a scenario that could have made this happen. I did a full rewire on a two bed purpose-built flat a few weeks ago. TNCS, cut-out in cupboard at the stair-well, I ran the tails to a switched fuse inside the flat and on from there to the consumer unit. All tested...
  13. E

    60a main fuse upgrade

    Evening All Ive got a residential house on a 60a cut out fuse being changed to a 6 bed HMO with 6x 8.5kw en-suite showers. Im am waiting for a quote from the DNO about upgrading the supply from 60-100a. I am thinking of useing 2x 3way Garo non priority sub DB's for the showers to reduce the...
  14. NellyManjaro

    Consumer unit below main fuse

    Just a very quick one as can't find anything that answers my question Doing a re wire and a very old property the main incoming cables come in half way up the wall.... providing I don't run my circuit cables past them is there any reason I can't fit the consumer unit below the main fuse? I...
  15. B

    Main fuse protection

    In our house the main fuse is rated at 100A maximum. The individual circuits in the consumer unit, if all used simultanuously, add up to much more than 100A. Now I understand this is common practice as it is assumed that not all circuits will be used to their max at the same time (the...
  16. C

    Pulling a main fuse

    Yes that old chestnut... It seems to invoke rage in some people but thats not what this is about... My question is has anyone tried to be sneaky about getting a DNO out? I find the people on the phone are jobsworths but the actual guys that come out are as good as gold (WPD) at over £200 to...
  17. D

    Boiler tripping main fuse

    I have a grant vortex combi boiler and it has started tripping the main fuse when the programmer calls for heat. Any ideas. Regards
  18. Adie moore

    no main fuse

    doing a eicr today and the apartment im at, along with all the others, has no main fuse. there is a big service head, possibly containing individual phase fuses, but I've not opened it up. from there you have single 25mm tails going in to each meter for each apartment, then in to an isolator...
  19. J

    What the hell is this main fuse?

    Hi All On a job this morning doing an EICR. As you will see from photos main live conductor showing signs of burning out at termination. Checked tightness of termination and main switch all seemed fine. I thought I would check main fuse rating to see rating of this. Supply is tncs with 16mm...
  20. Baddegg

    Limitation on main fuse type??

    As per title, changed CU today in a flat and main fuse was just a red link type thing.....have no access to any other meters or incoming supply for the building (4 flats) and the tenant has no idea where to even point me to find out, will ring scheme for advice on Monday but interested in others...
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