sub-main

sub-main

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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. B

    Earth bonding via sub-main??

    Hi De Hi, I'm pricing for a small kitchen extension. The owner of the property has run a 10mm^ 3core SWA around the outside of the building from the garage to supply a new C/U in the kitchen. All well so far. The problem is that the Main Water and Gas has not been bonded to the MET! The...
  12. J

    16mm T&E sub-main question

    I have been asked to price for a db change in a flat above a veterinary centre that the nurses on call stay in. The supply to the whole building is a TN-S 2 phase. It has a 16mm main earth conductor, 25mm tails and 10mm's to services. The flat above is supplied with a piece of 16mm T&E on a...
  13. S

    Would you run a sub-main..

    The unit we are working at, has a 3phase proteus (yuk!) DB at the front of the unit. The unit is approx 33mtrs long by approx20mtrs wide. The guy who has asked me to help him out on the job has agreed to run power lights etc circuits to various areas. Now the sockets they have marked out...
  14. A

    Doing my first sub-main in SWA.

    I'm just about to wire a sub-main from an entrance hall into a flat, about 4-5 metres away. I guess it'll have to be in 25mm which in SWA is going to be like a broomstick? As it's my first crack at it, how difficult is the termination going to be at both ends and are there any particular...

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