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size

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  1. C

    Swa sheath size too small

    an outbuilding is supplied by a 50mm twin SWA cable from a PME supply The assessor has told me to convert to a TT as the steel csa is too small, is there a way I can prove that surely a 50mm twin swa sheath is suitable to be a 16mm earth?
  2. M

    Wow the cost will be crazy

    If they think these will take off i recon they are wrong. Retro fitting them will always have problems as the wiring cannot be guarenteed. Fair enough in industrial but not domestic. At 211 for 1 unit. I seen a picture today of a cu with main switch and 8 of these and a spare 2 way space. Didn't...
  3. C

    Determining the size of multi-core armoured cable to use

    I would like to have insights from fellow Forum members on how to size multi-core ( 4 core PVC/SWA/PVC Armoured Cable) for buildings. For a example,what size of armoured cable can withstand 100Amps ( 3 Phase supply) . The building is 15m from the nearest electric pole where the armoured cable...
  4. Y

    Choosing a power supply, switch fuse size

    Hi all, I'm new here. I have qualified back in 1990 and worked only a few years in the trade. Now I'm back and I find myself a bit "rusty" and in need of a bit of help... I have to wire a complex of coldstores and I have to make a fuse boards for a part of them. I have 6no 10 amp MCBs, 2no 20...
  5. captaincaveman

    Apartment block main earth size

    Hi chaps, Could any of you help me out with this one please as I don't usually do apartment blocks and haven't come across this scenario before. Large apartment block built 2004. Looks like the tails enter the consumer unit via Armoured cabling with the armour being used as the main earth &...
  6. robd

    Minimum bonding size TNC-S

    Afternoon all, Just trying to clear something up, going through regs book at present. Basically have got a TNC-S/PME installation, 16mm tails, 60/80a main fuse (think it is 60A), 6mm bonding to water and 6mm coming from service head to block then into CU as main earth. Am I right that being...
  7. B

    What contactor size for a 9kw electric boiler

    Hi all. Don't have much experience on this topic. Called to a job with an electric boiler. It has a dedicated 10mm supply from a 50A MCB. I narrowed down the fault the the contactor which was only feedig 1 of tge 3 elements and had scorching marks around the other 2 terminals. And is currently...
  8. M

    TT system earth cable size.......

    Hi guys At a job doing a re wire and the electrician i was with is changing the earth cable over from 16mm to 6mm He says as its a tt system that it only needs a 6mm. Is this right?
  9. dnjr

    Swa as cpc what size ?

    Dear all Testing a garage that is fed in 2 core swa using the swa as cpc Live and neutral are 2.5mm. I know the swa is fine as a cpc but I’m unsure what size to put on certificate for it Seen a table that says it’s equivalent to 17mm but in the back of my mind I remember you need to divide by...
  10. P

    what size wire do i need for welder in garage

    Hi garage 37 metres away .From main consumer unit in house to a consumer unit in garage 47 metres .The garage runs off 2.5 swp under ground and operates lights 6 amp and a 32 amp ring everything works ok for what I used it for ,now I am thinking of running a welder .So my question is would you...
  11. P

    Shower upgrade and mcb size

    Hi there.I am looking to upgrade my daughters shower in her flat.The shower is a 7.5kw at the moment,but is struggling with producing a decent temperature with the weather as it is.I was aanting to put in a 9.5kw instead.I have checked the cable from the mcb to the pull switch,and by posts i...
  12. J

    Fuse size for sy plan am2

    Hi, Can anyone who has passed there AM2 please tell me what size fuse they used for the sy heating plan. It is fed from a B16. So, would it just be a 13a? I have seen them just on a 3a before. Cheers
  13. L

    Medium size shop. Full concrete construction etc .Basement with 2 fire exits.Fire /smoke alarms?

    As title ! Single entry ground front door. twin stairs to basement . Each side of basement (It was knocked into one years ago) has its own fire escape etc . what would be the Basic level of Fire/smoke detection equipment that"should be required" for each of the 2 floors ? Thanks
  14. C

    Pat testing cable size

    Hi Guys I've just had a discussion with my boss about cable sizes when pat tesing 415v equipment. This is how i have been dealing with cable sizes. If i have an extension lead with 32A plugs and sockets on I always make sure it has a minimum of 4mm cable so that it is capable of carrying the...
  15. B

    Calculating main switch size

    My friend, a plumber is at a job with a 63A 3 phase main switch, and the board has a few 20a circuits, a few 10a, and a few 32a. Hes replacing the 20a double pole breaker from the old water heater to a 3 phase 40a breaker, to suit the new heater. What is the formula/calculation to determine the...
  16. J

    Uncertainty over cable size

    What is the correct cable size on a radial circuit to feed kitchen sockets, except for the cooker,on a 32 amp fuse?
  17. M

    PV Cable size.

    Hi All House been rewired and want to futurise for PV panel. What cable size is required back to consumer unit? Thks Martyn
  18. R

    looking for a half gang / architrave size fused spur

    Hi, I am trying to find a fused spur that is as small as possible. I'm not sure of the correct wording but it needs to be smaller than a single gang back box. To explain what i am trying to achieve, i need to cut the plug off a flex that connects to a small transformer for an POE injector. As...
  19. Steve93

    Formulae help please!cable size and volt drop

    Got to that time my boss wants me to ‘prove myself’. We have a job coming up and it’s a solar there’s a 40kw inverter that is 3 phase. He wants to know what cable size will it need to be and how much current per phase? Am I right in thinking it is power/voltage? 40kw/415=96.3A? Will that be the...
  20. J

    Supply conductor size for 8 bedroom Victorian house

    Hi folks, I've recently visited a large 8 bedroom Victorian house. It has a three phase supply. One of the phases feeds the main house, its wired through a 100 amp main switch/ isolator. The Suppliers Side is 25mm tails but the customers side to the main house consumer unit appears to be 16mm...

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