calc

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  1. M

    First Problem!! Cable calc for lighting circuit.

    Here goes.....Im doing the 2357 C&G course. For one question I have to do a cable calculation for power and lighting circuits. I am having issue with the ground floor lighting circuit, in a domestic dwelling, as in I am way off the 3% tolerance for volts drop. Details as follows: Plan view of...
    • Matty G
    • Thread
    • cable calc ceiling circuit first fittings lighting lighting circuit point problem switch
    • Replies: 15
    • Forum: UK Electrical Forum
  2. V

    Cable calc verification please

    Hi Guys, Can someone please confirm for me the cable size required 120m length, 63 amps, voltage drop 2%. three phase. Does not have to be SWA. I think it should be 25mm but would like a second opinion please. Thanks in advance
  3. moose

    Cable Calc ?

    Hi guys im having a brain storm of absolute brain death. Fire alarm Loops of around 600m and 500m Give or take FP 200 1.5mm (1100m Total cable not accounting for Cutting to much cable etc) My problem is this, the 2 Loops of cable gave me a resistance Value of about 3.07ohms cpc to cpc and...
  4. S

    Ring main design calc

    Going through a ring main design calc for a course I’m on to determine c.s.a of ring final conductors. As we don’t know the load current for circuit we assume this to be the rating of the overcurrent protection device. I.e 32a. Only correction factor I need is grouping factor which is 0.45. 32 /...
  5. dansk

    New SAP Calc Query

    Just quoting an East/West job - East Array @80d and West array slightly north of West 105d - The new guide doesn't seem to accommodate anything North of E/W - i know we don't do much North facing, but the fact remains it does happen and i dont see anywhere for the Kk factor. Also PV-SOL is...
  6. M

    Calc for Cable size HELP

    Can anybody clarify this for me I have perchest a book for solar electricity called the solar electricity handbook as i am going on a PV course in April and it has a calc in it for determining cable size (L x I x0.04) – (V – 20) = Cable csa it seems...
  7. P

    3 phase cable calc and fuse sizes for motors

    Hi am currently employed as testing and inspection on a industrial site just wondered if you could give me some advise What it is I got a 110 kw motor 180 amp 100 m run full load now I got a 75 mm cable supplying it . I have checked table 4d4a in the regs as it is 3 core armoured . Ref method E...
  8. S

    Obvious question on transformer calc

    Calculating the voltage to be able to calculate the full load current of a 850kva 32kv/400v 3 phase transformer with 8% reactance: 400 x 8 100 = 32v can some one explain this? It won't bloody sink in until I can see why I am 1. Multiplying the voltage by the reactance and 2. Dividing...
    • Spark2be
    • Thread
    • calc question transformer
    • Replies: 10
    • Forum: UK Electrical Forum
  9. i=p/u

    Cable calc

    I want to install a 3ph dis circuit, giving roughly 90a supply to 3ph board, keeping vd under 1% so say my ze is 0.35 ,using 3 ph 32a type c breaker and length of circuit is 40m, im comming up with 16mm conductors ??? Does this seem right... When it says kw/vx1.732xpf im getting this part...
  10. D

    A quick mcb calc for the newbies on here.

    I just want to see if colleges are teaching correct methods for woking out what mcb would be needed in a certain senerio. Please dont answer if your experienced in circuit design or if you can see what im curious about. 1. I want to choose a MCB to protect 1 x 400w high pressure sodium...
  11. J

    little help with volt drop calc

    Hi everyone just a little confused,when calculating volt drop using table 4Ab do you measure the voltage of the installation and use that value to calculate or do you just use the 230 volt value
  12. O

    My head hurts - cooker cable calc

    Ok, had far too much to drink last night and wish I'd done this estimate yesterday but didn't and need a sanity check. New dual fuel cooker being installed (gas ovens) and electric hob This is the electrical spec Power ratings - hob 1 x 1kW, 2 x 1.7 kW, 1 x 3.0 kW, 1 x 3.5 kW, 2 x 1.1kW...
    • Octopus
    • Thread
    • cable calc cooker cooker cable
    • Replies: 28
    • Forum: UK Electrical Forum
  13. F

    volt drop calc

    just a quickie volt drop = mv x amps x length divided by 1000 so the amps is that the breaker size or the current carrying capacity of the conductor
  14. M

    Load calc for 3 phase supply??????

    Hi all, i need the calculation applied to work out the current per phase for a 3 phase circuit. Found a 9.1 kwatt heater on a 25A triple pole mcb (60898), so on single phase load divide by volts = amps, but this is not the case for 3 phase, any help much appreciated????? Oh i found the heater...
  15. Baker1988

    Cooker circuit calc

    Hi all im only at college training but i have just been reading a post about a cooker cable i was just wondering about this post here goes if you was putting in a new cooker circuit for a cooker (say 10kw) would u not add it up and to 43 amps and use a 40 amp breaker because it said u take 10...
  16. T

    help with a calc

    Say I have a circuit that pulls 16A @ 24V how do i work out the ratio for the load at 230V? Thanks
  17. S

    Cable Calc help please...

    Hi, I need to install a supply for a new coffee machine. It is 6.9KW = 30Amps It will be a 40mtr run I think i have this right but my calculator is playing up a bit, Ib = 6900/230 = 30A In = 32A In / CgxCa = Iz 32/0.88x40 = 0.9 Iz = 32+0.9 = 32.9A Page 338 in the green Regs...
    • Sparky83
    • Thread
    • aus cable calc electricians' talk help help please please
    • Replies: 10
    • Forum: Australia
  18. S

    Shower cable size calc

    Hey all. Hope everyone is well. Ok, I'm currently doing a rewire on a ground floor flat. The entire job will be done in trunking and I have an apprentice with me. Now, my intention is to run a 10mm cable to the shower as it's 9.5kw (I do this as a rule of thumb). This is also in our company...
    • sparky05084
    • Thread
    • aus cable cable size calc electricians' talk shower size
    • Replies: 11
    • Forum: Australia
  19. T

    2 feeder cables in parallel VD calc

    anyone able to help with this? I understand mVxInxLofRxtemp/1000 but it's surly not applicable so what calc is to be used? thanks
  20. G

    45kW Motor Calc

    Hi Guys I recently installed a supply to a 45kW motor for cooling tower. I carried out the following calculation: IL=P/VLx1.73 =45000/400x1.73 =45000/692 =65.02A There was only a short run from the cabinet to the motor so a 16mm SWA seemed the correct cable After the motor was running I...
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