volt drop | Page 5

volt drop

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  1. W

    3 phase volt drop calcs

    Hi guys, Looked over some previous posts and done some further reading, and attempted the calcs, just want to check that i am not miles off the ball park here with this. From what i have read harmonics and current down the neutral will cause massive fluctuations in results not to mention...
  2. 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
  3. F

    Volt drop

    Ok you do all your calculations to determine your volt drop and your calcs come back that the volt drop is just above the 5% allowed ok I no it dosnt conform to bs7671 and you should increase the csa of the cable to next size up but what effect or could some one explain in simple terms the...
  4. H

    Volt Drop

    Pricing up a job in a factory and have to wire in a 3 phase supply, just going to double check my cable sizing i calculate i need to use a 10m cable Swa cable clipped direct on its own , 35m run feeding a unit needing a 3 phase 20amp supply am i right ? just seems a little on the heavy side ?
  5. Jackflash

    volt drop

    Hi, I need to take a Supply from a house CU to an outbuilding which has a 20A radial socket circuit and 6A lighting. The cable run to the outbuilding is 20M then the lighting circuit inside the outbuilding is approx 10M in length and the socket cicuit 15M in length. I'm trying to calculate a...
  6. P

    Volt Drop

    Hi guys, Need to put a 32A 3phase supply in to a 10KVA site transformer using swa. The run is 250m long but would i need to apply 3% or 5% volt drop?? It works out at 3% i need to use a 35mm cable and at 5% i can use 16mm. Anyone have any idea??? Thanks Phaze-3
  7. B

    Calculating volt drop for >16mm cable

    Hello there. I'm trying to calculate the volt drop on cables that are over 16mm csa using the tables in BS7671. It's quite easy for lower sized cables, (length x design current x mV/A/m, if I'm right) but what happens when you go above 16mm and have a resistive component mV/A/m(r), reactive...
  8. H

    1% AC volt drop

    Hi Guys, I haven't been on here for a while and was just wondering how most people are interpreting the DTI guide 1% voltage drop recommendation nowadays? Is the only way to be 100% sure that inverters will not ever drop out to design to 1%? And when meeting 1% requires enormous cable sizes...
  9. M

    Volt drop question.

    A single phase power circuit supplying an item of equiptment, having a full load current of 25A, is to be checked to confirm voltage drop compliance , the circuit is to be installed using 6.00mm2 copper conductors, with a circuit length of 35m. a) Calculate the maximum permissible voltage drop...
  10. La Poste

    Volt drop, why do we bother?

    Looking at the regs it says we have a supply of 230 Volts and so we do our calculations based on this so that if we had to install lights on the end of a long cable we would use a cable with a larger CSA and hence more cost. The fact of the matter is we have a supply of 240 Volts so why do we...
  11. La Poste

    Volt drop question

    Greetings. Let's say you have a 2.5mm cable that you want to extend by quite a long run. After looking at your load and volt drop calculations you arrive at a cable size for the extension of 6mm. Would it be bad practice to add a 6mm extension to the end of a 2.5mm cable? The circuit...
  12. M

    Volt Drop

    Would I be correct in assuming that the supply cable which enters your house has been (in theory) calculated in such away as that there will be no volt drop across it as to ensure that 230v (or thereabouts) is at your DB and available for all your circuits, providing they have ample size...
  13. Amp David

    Volt Drop calcs max load help.

    Looking at a job at the minute which is only for 3 IP rated double sockets down a garden. Problem is the garden is almost 35 meters long, then its another 21 meters from switch fuse in the house. Anyway, what I need to double check is when choosing cable sizes for my runs, what is best to...
  14. 1

    volt drop for 25 degree C?

    what it the calculation for voltage drop at a operating temperature of 25 degree's C? e.g. a 5Kw 400V 3 phase machine Ib = 7.4A L (in meters) 32m
  15. Q

    DC Volt Drop

    Has anybody got a chart for quick reference that can show me volt drop, i know the calculation but just wanted a quick reference table. Can any body help?
  16. S

    DC volt drop

    Anyone know of a good online volt drop calculator. We need to work out cable sizing on long underground DC runs of up to 100m thanks
  17. A

    3 phase volt drop

    (sorry this went into a few forums it should not have -my bad) Any help would be great A volt drop calculation that i could do with some help with is the 3 phase VD I fully understand the single phase vd calculations but just wanted to get a confirmation when using 3 phase. e.g Say a large...
  18. A

    3 phase volt drop

    A volt drop calculation that i could do with some help with is the 3 phase VD I fully understand the single phase vd calculations but just wanted to get a confirmation when using 3 phase. e.g Say a large load of 30Kw is 200m from the point of distribution and you need to find out the volt...
  19. R

    massive supply cable volt drop

    a customer has asked us to wire up a caravan park thats he's building on some of his land but we're struggling to decide on the size of the sub main to power it all. he has 2 fields which will each have 20 caravans in them. The plan is to supply a busbar chamber in a mains room at the start of...
  20. G

    volt drop

    I have a 4mm armour feeding a inverter 22m from board i worked out vd= resistance per metrex2 xImpp x length which was 0.0046x 2x8.04x22 =1.627 Would this be volt drop in volts or % volt drop?

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