sub-main

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  1. L

    Planning garage sub-main project

    Hi all, 2nd year apprentice. I'm looking to take a supply out to my garage, which is detached, from the DB at the front of the house (2 bed terraced, built 1978~) The length of run is about 30m (having to go through either loft or under floorboards). Intend to have a 20A radial and a 6A...
  2. B

    6mm kitchen sub-main

    Howdy All, just after a 2nd opinion as i'm doubting myself. I went to a property to look at replacing the ccu, I noticed what I thought was a 6mm cooker circuit on 32a But found it was feeding another ccu in the kitchen (Extension) I couldn't open the ccu as it was boxed very tightly!! it has...
  3. D

    Sub-main to the garage in house I just bought

    Hello all. 17th edition sparky here, but not been on site for the last 3/4 years (had a bit of an accident). Just bought a house with a 16mm 3 core SWA, 15m long, clipped around the side of the house low level. This feeds the double garage. It has it's own 100A fused isolator in a kitchen...
  4. Msitekkie

    Smallest Sub-Main board with selectivity

    I need to fit a small sub-main board by my service head, to feed a garage unit in an outbuilding. I am thinking of using a Chint shower unit (Screwfix), but replacing the internals with a S Type Time Delayed RCD. Is this a valid approach for a sub-main, as opposed to using a switch/fuse unit...
  5. P

    315A sub-main options

    A potential customer of ours was asking about having more power made available. Just now it is just a casual request and it looks like they want 9-10 * 32A TPN supplies so, say, 315A total. We can get that much easily from the bus-bar chamber around 100m away but from a moment on an on-line...
  6. W

    Connecting domestic sub-main to REC cutout

    Been retired for a number of years and not kept up with the industry hence I'm well rusty, so apologies for that. I recently moved home and found that the sub-main cable (10mm x 3 core SWA) feeding the garage/outbuilding is connected to the electricity boards meter & service fuse (cutout) via...
  7. S

    Strange N-E fault on armoured cable supply to sub-main

    I've installed a garage consumer unit sub-main to an outbuilding in 16mm 3 core armoured, the insulation tests all come back fine - +800Mohms on a 500 volt test but when I power up the installation I get 90 volts leaking to Earth from Neutral and i'm not sure why. The Garage RCD also doesn't...
  8. J

    un-metered sub-main?

    evening-hope we are all enjoying the white stuff!! I looked at a promising job last night- its a old retail style place which is being devoloped into 1x mews house and 3x 1bed apartments. In the tender pack- it states they will be getting a new 3phase supply put into a communal cycyle store...
  9. andysparkfree

    Nice testing opportunity , however does anyone know the average prices per circuit and sub-main?

    Hi guys, i hope you all good !! i have a quick question , i have to price a testing job to an 8 level office up town and im good at pricing labour for 8 weekends , however a few years ago (maybe 5) i think i was told a rule of thumb was each circuit was to allow £18 and each sub-main was around...
  10. M

    Sub-main install urgent question

    Hi Everyone Looking for you knowledgeable people to help me out with question about the routing of sub-mains. UKPowerNetworks are soon to install a new 3-phase supply to an external meter box. This will supply two separately owned maisonettes (shared Freehold) - one on ground floor and the...
    • Martin252
    • Thread
    • cable ground install question sub-main through urgent
    • Replies: 8
    • Forum: UK Electrical Forum
  11. J

    16mm Sub-Main on 100A?

    Hey guys, so I'm new here and have a question. A local venue I work for has recently has had some electrical work done in order to increase the amount of power available to them, by bringing a phase in from the shop next door. Previous to this, the supply was 3ph, 100A, and they have had an...
  12. R

    Sub-main protection

    Quick one, Job at work, New SWA submain (60A) underground from meter position in garage to the house of about 25 meters. I'm under no doubt that an OCPD is required in the garage end and that you can't just use the main service fuse to protect that cable. However I'm struggling to find a reg...
  13. C

    RCD protection for sub-main

    I am having to run a large SWA feed cable to a fixed load (45Kw TP). The cable will be run externally but above ground on cable tray. Do I need to provide RCD protection for the SWA cable at the distribution board end??
    • chloebear
    • Thread
    • arrangement cable distribution earthing protection rcd sub-main
    • Replies: 6
    • Forum: UK Electrical Forum
  14. J

    Sub-main query

    Good morning! Hoping to get some advice from someone more knowledgeable and experienced than I am. I have a 100A PME supply to a garage. I am providing a new sub-main to a new studio/workshop which is about 30m away from the garage CU. I have run the cable through underground ducting...
  15. E

    Sub-main with main head.

    Hi all, I am working out some cable calcs for an outside lightinginstall in a domestic/commercial environment. It’s a house with a commercial yard at the back of property,100m away. The circuit will be supplied form and existing submain. Now as far as I am aware volt drop has to comply back...
  16. S

    3-phase sub-main sizing

    hi chaps, I've got a 3-phase supply to get in and am not overly experienced in 3-phase cable calcs, basically the run is 60m, it will be buried, and it needs to run one 3 phase 16A boiler, a couple of single phase socket outlets and a couple of lights. hope somebody can shed some light
    • suffolkspark
    • Thread
    • 3-phase sizing sub-main
    • Replies: 21
    • Forum: UK Electrical Forum
  17. S

    Sub-main advice

    Hi, Went to a job this morning to change a few lights & install an additional socket. This was a building where the owners have decided to rent out half of the building as they are not using it. They have completely sectioned it off, ripped all the electrics out. A 60A fuse from the old half...
  18. E

    Sub-main calculation help!

    iv been asked to install a sub-main to supply a house. The supply is quite far away from the house (40mtr) the cable will be installed direct in ground (SWA) im abit rusty on my cable calcs and could do with some help and advice. hear is where i am at the moment... ok so after applying...
    • energizedelec
    • Thread
    • calculation electricians' talk help help! sub-main
    • Replies: 5
    • Forum: UK Electrical Forum
  19. t01474

    Sub-main protection on farm / equestrian area

    Evenning everybody. I've been asked by a farmer friend to remove a CU inside a trailer and replace it with a waterproof one in an enclosure outside. The CU currently feeds three stable units via three seperate 4mm SWA radials. With regards to RCD protection what does anybody recommend? Ive been...
    • t01474
    • Thread
    • area aus electricians' talk farm protection sub-main
    • Replies: 8
    • Forum: Australia
  20. M

    Upgrade sub-main CU (for registration)

    Hi all, Be kind it's my first post. I've been asked by a friend of the family to do some work on the electrics, which is good as I hoping to get my Part P assessment done this year. The house had a LOT of work done to it about 10 years ago, including a substantial extension and a garage...
    • MK-MIKE
    • Thread
    • aus electricians' talk registration sub-main upgrade
    • Replies: 9
    • Forum: Australia
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