volt drop | Page 7

volt drop

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  1. S

    Volt drop effect on appliances

    Hi Guys I have a question regarding volt drop. Some time ago a company I worked for installed wall mounted aircon units around their workshop. They wired them into an existing 2.5mm ring main circuit which was in singles in a truncking. During operation some of the units would cause the...
  2. S

    Volt drop theories

    I've yet to come across this problem but like every good scout I like to be prepared. If a circuit is over the maximum volt drop permitted but fixed in the length of the circuit, how would you over come this? Would it be a simple case of using cable with bigger csa? Does anyone else know of...
  3. T

    General questions on volt drop.

    1. Discharge lighting is on a 16A mcb, can it stay this way or will it need to be updated to RCBO for the new regs? 2. Radial sockets 50 metres away, on 32A RCBO, wired in singles, in trunking and conduit. What size cable should be used taking voltage drop into account? 3. 3 phase motor...
  4. F

    volt drop?

    hi im struggling with volt drop , the circuit is 6mm 2core swa , run under ground , 220M long ,supplying a transformer charging batterys for a gate system rated at 5A. Can anyone help me and give me the formula for the calculation? Thanks:confused:
  5. S

    volt drop or not

    Hi all My question is this If a submain is run off the No.1 C/U to a No. 2 C/U, when we calculate the cable sizes for the C/U2 final circuits do we use the volt drop value of the sub main or do we use the 230v value ??? thanks for any help john
  6. E

    Volt drop calculations

    It's been some time since i've needed this but can anybody out there supply the formula
  7. B

    Volt Drop

    This is a 2391 question DURING THE COURSE OF AN INSPECTION ONE OF THE SINGLE PHASE RADIALS supplying an item of fixed equipment is to be checked for volt drop. 45A full load, 80m length, 10mm singles,70 degree thermo singles, steel conduit, mohms/m at 20 degrees=1.83(p166 OSG)...
  8. J

    Volt Drop trouble

    Hi ALL Have to install a Condenser unit on a roof in the nxt couple of weeks the length of run is around 50M the unit FLC is 24A will be Reference method E on Try for most of the run 4mm swa can take 41A table 4D4A and 6mm can take 53A. Just need some advice regarding VoltDrop As this is...
  9. S

    Current carrying capacity and volt drop calc

    Hey all. Hope that this post is relevant to this section. Got a call this morning from my colleague who is on a large industrial job at the mo. He has asked me to calculate and come up with a suitable cable size that is forming part of a distribution circuit. I also need a suitable fuse size...
  10. zone77

    volt drop query

    When doing a volt drop calc for a sub board, is the max volt drop 5%(11.5v) ( the sub board feeds lighting and power circuits) or is it reduced to 3% (6.9v):confused:
  11. P

    volt drop

    can someone help me in understanding voltage drop please. can't remember much about it
  12. G

    Verification of volt drop

    Hi, I know how to calculate volt drops on radial ccts, As a ring main is a loop and you ignore any spurs is there a voltage drop or is it considered to perfect or near perfect mains voltage regulation!. How do you,or dont you verfiy votage regulation on a ring main when certifing that you...
  13. M

    2391 verfying volt drop

    Hi Guys n Girls Sorry if im having a dumb momment but I have a practical 2391 exam in march and i cannot remember for certain how to verify Vd. Im assuming i can calculate the circuit length by taking the r1+r2 reading - then get the m'ohms per/m for both cables from the (OSG P166). Then...
  14. S

    Volt drop and cable calculations

    Hi guys, does anybody have a quick or easier way of working lout volt drop or cable calculations?? Basically, a way of working out if cable size and length is suitable for design? I am always looking in OSG and BS7671, so wondered if any easier way. Thanks guys and speak soon. Sav :)
  15. S

    Volt drop and cable calculations

    Hi, does anybody have a quick or easier way to work out volt drop and cable selection calclations ?? I always refer to the BS7671 and OSG, but wondered if anyone had an easier way to work these out. Cheers guys and speak soon Sav :)
  16. K

    Volt drop on three phase sub main

    Can anyone tell me is the allowable volt drop for a three phase supply to a sub main 3%????? Cable length 120m 100A supply Correction factor .81 per ampere per meter 100Ax120mx.81 1000 = 9.72v 400x3%=12v so this is good ya? Keith
  17. A

    Volt drop

    Got an interesting problem today, got a call out to some lights flickering on and off intermitantly we turn up have a look and they are all ok then they all turn of and take ages to strike back up (switch start flouresents) so i think supply problem check the voltage and yep 202v trace it...
  18. E

    Volt Drop Calculation

    Appendix 4 in the regs has tables for Current-Carrying Capacity and Voltage drop. I've used these many times with no problems, but i've never had to calculate a cable higher than 25mm. when you look at cables 25mm and higher you see three values for mV/A/m (r, x, & z). Using the calulation...

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