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  1. I

    Bonding Size for Old Incoming Supply

    Incoming supply on our job comes into the building and then the tails from which go into a switched isolator with 200A fuses fitted. No idea what size the incoming fuses are or incoming conductor sizes. Would have to contact the DNO but not sure whether they would give that info to anyone or...
  2. S

    Service cut out 80 meters away from the installation. Is it OK and Cable Size

    Hi All, I have a client who is developing a plot of land for a single house. Currently, their 100 amp service cut-out is in a cubicle fed by overhead cable, however, this is in the way of the build. Rather than having the cubicle moved before the build and then again once the build is...
  3. T

    size of earth on 16mm mains tails

    Hi I have a domestic installation to rewire and the main incoming fuse is 80 amp so i am using 16mm double insulated tails, is the main earth size with this 16mm or 10mm ? Thanks
  4. A

    UK reg to say 2 different size cables cant be used on one circuit if rcbo rated to lower cable?

    Came across a cooker circuit with 10mm and 40A rcbo. Last leg was 6mm. Isolator to outlet. I downgraded to rcbo to 32A to accommodate the 6mm. Does the cable have to be the same throughout? If so what is the reg for this please. 🤔
  5. D

    How to calculate an MCB size

    I am doing a campervan conversion and have a 16A/250V shore power connection coming into a consumer unit which has two breakers - one for the AC input into a Victron Multiplus inverter and the other to go to a plug socket for non inverter loads. I would like to know how to size the MCB for the...
  6. P

    SPD Conductor Size Question

    Hello, I have a Leviton 51120-1 SPD connected to a residential (120/240V) 200A breaker/service main panel – The 51120 is fed from (2qty) – 20A breakers in the service panel – All wires connected to the 51120 (L1&L2 hot, neut,& ground) are 12 AWG stranded conductors – The install instructions...
  7. Mr305worldwide

    How to find right size carbon brush for electric motor?

    Hi all. Im looking to replace the carbon brushes on the ABS electric motor in my car that no longer works correctly. Thing is, I don't know how to find the right size and I don't want to remove the motor from the car unless I have the part on hand. I'm looking on Amazon but it seems that there...
  8. D

    Cable size for 9kW shower

    Hi, Same project as detailed in my other post (I want to run shower cables to the CU whilst the kitchen ceiling is disturbed). I'm going to install a 9kW shower, cable length will be 12m max from CU to shower switch. Cables will run in the cavity between between floors (between floor joists)...
  9. O

    MCB size and wire size for an electric oven and induction hob

    Hello I have two new appliances Electric oven rated at 3.95 KW Induction hob rated at 7.2 KW total of 11.15 KW Currently it is on its own supply with a 10mm Twin and Earth and the MBC is 32amps Can you please advise if the following Cable size is sufficient ( behind plaster ) MCB Amp...
  10. Z

    Main earth size on TN-S

    Hi guys. I was on EICR yesterday, where i found that the main earthing conductor is with very small csa- no more than 2.5cm2. Also they run the wire directly behind the CU, where it is twisted with 10mm2 and continues to the MET inside the board. Ze at the board is 0.28 ohms and seems to be ok...
  11. Y

    Work out breaker size?

    Hi, I'm a first year apprentice... just trying to get an edge on theory. Calculating breaker size: W ÷ V = A So say appliance needs 4000 watts 4000w ÷ 230v = 17.39amps Then, from research I seen a rule that the breaker shouldn't be running above 80% of it specific ampacity, so you multiply...
  12. Justyjust

    What cable size would I need ??

    I brought a semi professional falcon cooker and currently my property doesn’t have any high power cooker supplies, the cooker draws about 11.5kw from what I can work out. Does anyone know what size cable I need the distance from consumer board to cooker is about 15 meters away. Thanks j
  13. M

    twin and earth cabling size for commercial buildings

    Hi, The current carrying capacity tables in the BS 7671 for twin and earth cables are only for buildings that have thermal insulation. I'm working on a commercial building, the inner walls do not have thermal insulation, what can i use for the current carrying capacity of the cables. The...
  14. C

    UK 50 Amp RCBO blue wire size question.

    I have a 50 Amp RCBO by "FuseBox" My device is part number RTO65030B https://lamplec.co.uk/ProductDetails/?code=RT065030B From a layman's point of view the blue neutral cable looks very feeble for a 50 Amp maximum load. Also there seem to be some RCBO's on sale with the bottom clamp terminal...
  15. J

    Inverter Size for Battery Output

    I thought I had an understanding of how to size an inverter but I think I have become slightly confused after taking to some proposed installers. I am looking at a 15 panel solar array with a proposed output of 6150KWH and was thinking of having two 6.5KWH batteries that would have their charge...
  16. H

    3 phase motor cable size

    Hi all, I’ve been asked to run a cable for a 3 phase DC motor. Not having much experience with motors would you work out cable sizing the same? In the picture attached are the details I have received. Any help would be great 
  17. L

    Pexman 42 BS to 6004/91 size?

    Hello everyone. I am trying to find out cable size used in my socket circuit. The only symbols I can see is Pexman 42 BS to 6004/91. Please advise what size it is and if it can be used in 32A radial circuit. Thank you
  18. V

    Neutral Conductor Size - Main Switch to Neutral Bar

    Don't come across this very often - but I've had a CU delivered for a caravan job (not static btw), and it's been supplied with a neutral conductor from the main switch to the neutral bar! Definitely an oversight, but I've got plenty of singles cable in stock, so rather than send it back, I...
  19. M

    UK Selecting bonding conductor size

    This is a question (or discussion probably) regarding selecting the main earthing conductor, and subsequently the main equipotential bonding conductor sizes in a TNCS installation. We are fitting a replacement consumer unit only. The property currently has 4mm bonding cable installed to gas and...
  20. A

    SWA banjo fly lead size

    Hi all. Could I ask some advice please regarding SWA banjo fly lead sizing. Can anyone explain what sizing or how you size the required earth size when: A) The armourings are not used as cpc B) When armourings are used as CPC? I’m still learning and can’t find anything explain I guess this...

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