calculations

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  1. P

    cable calculations single phase / 2 phase

    Hello all Just doing some cable calcs for a shepards hut site, the site has an incoming supply of 2 x 250a single phase supplys, was hoping to run a 4 core down from incomer to a board then split off to each hut. Do i have to work it out on single phase 230v or can i work it out on 400v
  2. Rebwar

    Circuit Summary and load calculations, L3 design project

    Hi Could someone check my answers in the page aploaded please? I'm not sure about my answers according the notes number 1 to 4 and also the stated circuits. Thanks
  3. D

    Power calculations help please?

    Hi All, First of all apologies for the potentially novice sounding question believe it or not I’ve been a qualified electrician for 10 years but I’ve always worked cards in so calculations have not been something I’ve ever considered I just install the sizes on the spec however I now have to...
  4. Khanzada

    Load calculations on three phase board

    Costumer have 12 flats and need to feed for each flat a prepaid meter and consumer unit within the flat , the main supply to building is three phase , my question is how to distribute the load for 12 flats, each flat have a load of 63A. Main supply is three phase .
  5. Loki

    Cable Calculations Sheet Updated

    Here‘s an updated cable calculations document for 2022, might help users doing their design projec?
  6. Gunarosid

    3 phase power calculations.

    Dear all.. May be some body can help me to explain what happened with my generator set module. At my attach picture. According to S2 = P2 + Q2 is not correct. Can some body explain it.
  7. B

    Help with complex circuit calculations

    I'm having a few problems finding these values in this complex circuit. I've tried several different methods but still cannot find a step by step process of finding the right answers. Can anyone help? It's been a while since I was at college! Thank you in advance ?
  8. S

    Armoured Cable Calculations

    Hmmm, Could anybody tell me which table I use for calculating armoured cable sizes in the on-site guide? I'm self teaching and failing :-(
  9. T

    UK Hotel extension cable calculations

    So I've calculated my hotel lighting and 1 circuit has an (ib) of 0.33a and I put a 6a breaker on it (in) then got my (iz) 5.8a which is suppose to be equal to (in) or greater right but it's not so what should I do to change this. By the way my (ca) is 1.03 my (cg, ci, cf,) are all 1. Please...
  10. R

    3 wire Delta calculations

    I have a question on 3 wire Delta connected winding with Phase Supply between X, Y & Z is 370 Volts. What is the voltage between One Phase 'X' and the center tap of the opposite winding? See attached doc.
  11. P

    SWA cable calculations!!

    Ive been asked to confirm the maxium possible supply for an existing SWA sub main and I know im doing something wrong with my cable calculations. Its a 10mm 3 core SWA currently on a b40 on a split load boad but its about 120m run ( direct burial) and they want to run an airsource heat pump...
  12. Loki

    Cable Calculations ( Updated for BS7671:2018 & Onsite Guide 2018 )

    Loki submitted a new resource: Cable Calculations ( Updated for BS7671:2018 & Onsite Guide 2018 page locations) Read more about this resource...
    • Loki
    • Thread
    • cable cable calculations calculations guide onsite updated
    • Replies: 8
    • Forum: UK Electrical Forum
  13. P

    Sub Main Design Calculations

    Hi all, new to here. Just designing a sub main, very long time since I have done this so just wanted some thoughts. Its to a summerhouse sort of set up that will be at the bottom of a very long garden at a later date (sockets, lighting and hot tub planned from the board). Patio is getting done...
  14. S

    Am2 calculations on test sheet

    I’ve got my am2 tomorrow morning, I’m pretty confident with everything and just gone over my testing and done the prep day yesterday, I was just wondering if anyone knows what calculations are needed on the back of your testing sheet to pass? I’ve got r1+r2/4 for ring final, zs=ze+r1+r2, my...
  15. Loki

    Cable Calculations

    Loki submitted a new resource: Cable Calculations - How to carry out cable calculations Read more about this resource...
  16. M

    CB Calculations for Underfloor Heating

    Hi All, I've taken a look at a consumer unit today and noticed that the previous electrician wired bathroom underfloor heating using a 20A circuit breaker. There are a range of spare CB's and having made my own calculations, just wanted to check what you all thought. According to previous...
  17. 2

    Cable calculations for pricing

    Ok guys it's back to school for me.... Since leaving college I have prided myself into thinking what a great electrician I am, only now that I am starting to take on my own projects from scratch it has become apparent that I am a little rusty on the theory side! Turning up as a subby, no...
  18. Alex-SL

    Is the IEC 60909 standard applicable for short circuit current calculations in UK?

    Hi. I would like to get a help from this forum electrical engineers. There is the international standard “IEC 60909” for calculations of symmetrical and asymmetrical short circuit currents. I need to calculate line-to-earth short circuit (circuit 0.4kV) by the software that uses calculation...
  19. L

    Voltage drop and cable size calculations.

    Hi, would like ta post a question about voltage drop in a cable. If I have a 230v single phase load of 500w with a 50 meter cable run reference method C . What would be the voltage drop in a 1.5mm2 ? From my calculations excluding pf I checked from the table the the voltage drop in mV/A/m of a...
  20. A

    Question regarding Voltage Drop Calculations

    When one is calculating the voltage drop of a circuit, one must determine the length of said circuit. However, I am not sure whether the length of the circuit includes the length of both the Live conductor running out from the consumer unit to the furthest circuit AND the Neutral conductor...

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