cable calculations

cable 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. I

    Cable Calculations on Ring Circuit

    Hello, I am a trainee electrician just starting to get into doing cable calculations. I understand them when it comes to a radial circuit but get lost when it comes to ring circuits. If I take my Ib and In as being 32A for example how would I go about selecting a cable size and proving it is...
  3. I

    Rio and BHP specs for unsupported cable allowance and Voltage drop?

    Hi senior members of the forum, I need advice on couple of questions about Rio and BHP specs for electrical installation purposes. What is the minimum allowance for unsupported cable coming out of cable ladder. This is for install of a genset trailer to load. The cable will be going through...
  4. Loki

    Cable Calculations Sheet Updated

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

    Size of imperial cable

    Afternoon all This is based on a previous thread I’ve worked on, carried out an assessment on site , found a imperial aluminium sheathed copper single supply cables measuring at 10mm diameter on the strands themselves , what size of cable does this make it? And what is the copper equivalent...
  6. S

    What size is this sheathed copper imperial cable?

    Hi guys , trying to determine the size of this imperial cable, 17mm diameter , what could the circumference be if it were double insulated? And what would be the equivalent cable now to use?
  7. T

    Cable prices increasing rapidly

    Hello Everyone Are we all facing the same problem of price hiking up of electrical cable? In this month alone start of 2021 the price has been changed twice. The first time wasn’t so bad it was by £2.00 the second time it was changed by a odd £6.00... Any info on this? Are prices likely to...
  8. multimarcus

    5v 60A Power Supply for LED Panels — Choosing good cable size

    Hello everyone! I would like to power 8 LED RGB panels, each takes 5v input and according to the datasheet 20W. (I take every consumes about 4A x 8 approx 32A) I have a Power Supply from Meanwell. It has a single output of 5v and 60A, I could also opt for a slightly smaller one, 40A if better...
  9. KeenPensioner

    Cable calculation parameters

    Hi, as I've said many times on this forum, I'm not an electrician and now retired. I'm still keen to learn and spend a lot of time studying all things electrical (especially during this lock down madness - it keeps my brain active!!). Anyway - I understand what Ib and In are and how they...
  10. RyanAspire

    New circuit design question

    Hi guys, Have a job on next week for a friend, my usual industry is maintenance so want to be sure I am checking all the boxes here. He intially measured the run out at 122m, which would require a 70mm cable due to volt drop, however its changed slightly and I have other queries... He now...
  11. 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 :-(
  12. 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...
  13. T

    UK how to work out what breaker to use and why (level 3 hotel extension assignment)

    I have 10 7.5A lights in a room on a breaker 10x7.5a=75a so 75a ÷ 230v is something crazy like 0.3A so what am I going to use a 1A breaker ? another example I have 700w AC unit 700w ÷ 230v= something like 3.2A yet again ovs not gonna use a 4amp breaker for a AC unit??? What am I doing wrong...
  14. 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...
  15. 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...
  16. Loki

    Cable Calculations

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

    Cable Calculations?!

    Looking at putting a lathe into a workshop.. 16A, 3 phase, a run of 19metres at approx 35 degrees. Also, a 3 phase, arc welder which I was going to put into a 32A socket outlet. 7 metre run, again at 35 degrees. Can someone help with how I would complete a cable calculation for either...
  19. B

    Cable calculations

    Can anyone help me out how to find minimum kva? The question is, determine the minimum KVA, you have 0.5kw, 12v motor and a power factor of 0.8 cheers
  20. A

    cable calculations

    Hey guys just practising my cable calculations, could you tell me if this is right I am doing it according the onsite guide as instructed in college... this is the example 11kw oven (i know its unrealistic just making things up) 16 metres from CU using MCB single phase 230V cable will be in...

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