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volt drop

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  1. B

    whats causing volt drop?

    hi i havint worked as an electrician for a good few years and a problem im having is wrecking my head. I came home last night and my lights seemed dim and where flicking (just put it down to bad weather) but when i turned my cooker on all my lights went out. after pulling the house apart i...
  2. L

    Volt drop

    Hi I've a few questions regarding volt drop. Apologies if its a little longwinded but I'd like to get my head around everything. An example scenario is a section board with a TP sub main to lighting and power board (DB2) Calculations for circuit : Supply Voltage = 400 Volts Ib - Design...
  3. andyb

    VFD Volt Drop Question

    I need a help from those on here with experience with 3 phase motors and VFDs. I have been asked to install the cable to supply a couple of pumps that will be controlled using a variable frequency drive. As they are submersible pumps they come pre wired with 12 core 2.5 rubber cable, 10 cores...
  4. Y

    DC Volt Drop Calc

    Hi all, I appreciate this has probably been posted to death but the search wont load on my phone. I have to calculate for Volt drop in a DC circuit, There's next to no load (2 amps max) the cable is 4mm pvc twin, and ln a loop from the control unit to the loads. OveralL Length 50m Is the calc...
  5. robd

    Hot tub volt drop

    Hi All, Been to look at a job with a hot tub 27A load, 30 metre run. Don't do much volt drop calculating but here's what I did, anyone disagree? Thinking 6 mm armoured so: 7.3x27x30/1000=5.91v max permissible (5% of...
  6. L

    Volt drop question

    Hi I've got a question regarding volt drop. When calculating volt drop to a 3 phase distribution board do I use 230v (11.5v) or 400v (20v) The board I'm attempting to put a cable to is 75 meters away. Design current 100A From TABLE 4D4A Cable selected = 25 mm² For 25 mm²: mV/A/m 1.75 for 230v...
  7. N

    Solar PV volt drop and cable sizing.

    Morning gents, just a quick one. I've posted this already on the Solar PV forum but thought I'd add it here too as VD and cable calcs are always a good topic of discussion. So I have a Solar PV system to install this weekend, its a 10KW single phase system on a farm. I'm going to be running a...
  8. D

    working out volt drop

    Hi I have been looking in to wiring up a garage which has a exsiting swa cable running to it just wanted to run this by some of your for your opinion . Supply is from 20a rcbo using 3 core 2.5mm swa into isolator In the garage there is to be 2 power sockets and 1 lighting circuit with 4...
  9. driverman

    Volt drop calcs on ring main

    Hi Guys, I'm not into design etc and never have been really but how do you calculate volt drop on a distribution ring main circuit? Ring circuit say covering a large area supplying various loads/buildings. I was thinking split the ring and work it out as 2 x radial circuits, but 1 radial may...
  10. M

    Volt drop

    Hi, Im a fairly new sparky, So just wanted to get a little idea as im not 100% sure, Im adding 12m of 1.5mm cable in trunking into a conservatory from a fcu of the ring main the volt drop for this part would be 4.5v so i may need to up the cable size. But what i need to know or confirm is what...
  11. M

    volt drop query

    Hi all, Am wiring in some lights in a carpark.. The total distance is 150m there are 4 lighting posts rated as follows A-200w B-300W C-300W D200W (with A closest to CU) All loads are LED They are spread at distances of CU - A = 30m A-B = 40m B-C = 40m C-D = 40m Having done my volt drop calcs...
  12. S

    Volt drop to summer house heating

    Hi. First time poster here so please go easy on me. A customer of mine has had a summer house built at the rear of her garden which has been supplied with two 6Kw heaters! Yep, 12Kw!! She would also like 2 switched double sockets and about 4 LED spots installed. Now the problem, as if a 12Kw...
  13. P

    Volt drop question

    Hi everyone, I am intending on working in the uk shortly, i am from ireland and dont have the uk regs presently. I am trying to prepare for the exmas i will face and the cable calculations/volt drop calculations are something i cannot remember doing here in ireland in my college time so my...
  14. K

    Volt drop at the other end of a SUB main.

    Hello people Just so i get this right i thought i would post my maths here for people to comment on. Garden lights on a sub main. Sub main is 20meters from the main CU on a 6mm armoured cable. the last light is 50 meters from the sub main. meaning end to end 70 odd meters. So my maths are...
  15. Simonslimline

    3phase volt drop.

    This is one of a weekly question by sparks magazine posted on Facebook to win free tools each week. Everyone has answered B. 8Volts. I am not sure this is correct. Please could anyone help me with this. I have posted it up in here rather than just the trainee section so more people will see it...
  16. O

    Volt drop question

    Hi all Just had an enquiry for 50 kw ground mounted PV system, the proposed system is to be connected to a three phase supply In an industrial unit, the ground mounted array will be approx. 200mtrs away from the unit. The inverters and generation meters are to be mounted next to the...
  17. A

    Volt drop tables for LSF T&E

    Which table do you use in BS7671 for volt drop for LSF Twin and Earth? There does not appear to be a table for LSF cable. 4D5 refers to the grey PVC cable and is not the right one to use for the white LSF. Any help would be appreciated.
  18. H

    Volt Drop

    Good Morning Visited a property yesterday. Customer saying only certain appliances working from double socket in bedroom. Electric toothbrush yes, vacuum cleaner no. After inspecting socket and wiring find that the socket has been taken as a spur from downstairs lighting circuit on 6A MCB...
  19. A

    Volt drop on outside lighting

    I got called to a job this afternoon, it's outside lighting, about a 1000w of lamps on the whole circuit, and when trying to quote for it done a few calcs and the volts drop is massive, it's 24 volts, the circuit is run in 3 core 4mm swa, and is 300m in length, now I know that it's well over the...
  20. M

    3 phase volt drop.

    Howdy, when designing a 250A 3 phase supply, what column value do you use for volt drop?? Table 4d4b, section 4(3/4 core 3 phase ac) column r,x or z. I'm thinking r, but not 100% sure. Cheers in advance!!!

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