voltage drop

  1. Simonslimline

    Voltage Drop

    When selecting a cable and taking voltdrop in to acount is it 3% for lighting or 5% for other loads of 230v Because the voltage obviously changes from anything from 216V up to 253V. Thanks :)
  2. Simonslimline

    verification of voltage drop on innitial verification

    When ticking the box for verification of volt drop on an innitial verification whats the procedure for this ? Would you not need loads to be running to get an accurate reading? Thanks simon :)
  3. V

    voltage drop over sub mains

    I am going to be installing a sub main from a house db (at meter position) to shed(1), then from that shed to shed(2), then from that to shed(3). I am aware that lighting is max 3% drop (6.9v of 230v) non lighting is max 5% drop (11.5v of 230v) voltage under no load at supply...
  4. M

    Voltage drop calculation

    Hello everyone just want a little help how you would calculate the volt drop if 230 single phase heater circuit line & neutral conductors combined resistance of 0.68 Temperature at 20 degrees and load current of 16A? show calculations got this in my 2395 today wanna make sure I used the...
    • Missing-spark
    • Thread
    • calculation calculations length method that's voltage voltage drop volts
    • Replies: 13
    • Forum: UK Electrical Forum
  5. E

    Voltage drop detected, various burns in switch and connections in oven flat

    Hi, I am Nicholas, I repair computers from home for a low paying hobby and repair PC power supplies with the skill of replacing bulging capacitors. I will try other repairs using the same skill of desoldering and soldering, and I am living in a single flat here in Auckland NZ. About 9 months...
    • eleNickBJ
    • Thread
    • connections oven switch various voltage voltage drop volts
    • Replies: 4
    • Forum: UK Electrical Forum
  6. Y

    Voltage drop question

    Hi everybody. I have a question (still learning, passed 17th edition and part P, but I'm not yet registered). If you use formula from On-Site Guide p.140 what the design current you put in the formula, to calculate max length of cable for 11.5V. If 32amp then the maximum length of ring final...
  7. HappyHippyDad

    Fear of voltage drop!

    Its been along day, I've just finished off with looking around a big garden which has all sorts of electrical things going and would appreciate a bit of advice on VD. Garden is supplied by 2.5mm SWA (buried), at present taking about 1000W from a 20A MCB in the garage CU. The chap wants 2...
  8. M

    Voltage drop

    Is there a voltage drop from DNO transformer to incoming supply? For a standard 100A supply to a house so they design cable to with stand no VD as so at maximum demand there will be no VD. It is then up to us to design circuits as to have as little as possible so that 230v remains everywhere. Of...
  9. A

    voltage drop

    2395 question regarding voltage drop, cant tremeber the question but it basically asked what is the voltage drop for a 40 amp circuit at 230v with a combined live conductor resistance of .23 ohms any idea? it had me stumped. thanks
    • ample current
    • Thread
    • circuit question resistance thought voltage voltage drop volts
    • Replies: 8
    • Forum: UK Electrical Forum
  10. keniff

    Voltage drop and 3phase

    I'm having a bit of a blonde moment, I'm trying to work out the volt drop on a 3 phase Submain, the Submain is to be supplying a 3phase board loaded with rcbo's all single phase loading, I can't for the life of me remember how to do it I think it's working out the single phase vd and multiplying...
    • keniff
    • Thread
    • cable final having neutral phase voltage voltage drop volts
    • Replies: 12
    • Forum: UK Electrical Forum
  11. C

    Why I get a voltage drop from my solar panels on the early morning and late evening

    The voltage drop is causing the inverter to turn on and off like 50 times in the early morning and in the evening. My grid tie Fronius IG 30 inverter is keep turning on and off like 50 times before it connects to the grid in the early morning because of the voltage drop. In the evening it...
  12. G

    Voltage Drop Calcs

    Hi, (new to forum, first thread) Trying to get my head round voltage drop and using the calcs in practice. I have radial circuit - 16 amp MCB on a 30mA RCD - 2.5 flat T+E out of household consumer unit, straight through wall and running in plastic conduit along outside of wall and into garage...
  13. F

    Calculating Voltage Drop on a Ring main

    Hi Guys, I'm fairly new to the industry and have sat and passed all the relevant exams to become a Domestic installer. I'm a little stuck with one of my pieces to be assessed by NICEIC. I'm doing a full rewire at my dads house and would like to check that I'm calculating the cable volt drop...
    • fire8789
    • Thread
    • calculating correct length main please ring ring main voltage voltage drop volts
    • Replies: 9
    • Forum: UK Electrical Forum
  14. Baker1988

    voltage drop calculations

    hi was wondering what every ones opinions are regarding volt drop calculations i know there are 2 ways the ohms law way and the way where you use tables of the bs7671, the thing is i taught my self how to do volt drop calcs so i learnt the ohms law way is this a acceptable way or should i do it...
  15. S

    Voltage Drop on cabling

    Good morning All, Ive been asked to work out the potential volt drop on 12 metres of 10mm x 7 core SWA powering a 45kW (60hp) motor. Just to check my findings as below, please could someone confirm whether I have done it right. 45kW - 80amp FLC as using Star Delta Starter multiply by...
  16. M

    Voltage drop calculator

    Need advanced voltage drop calculator
  17. C

    voltage drop calculation

    i want to know the formula for voltage drop calculation for 3 core x50mm2 hv cable feeding 1000kva transformer 13.8kv. the cable is xlpe ,armored..it is connected from Ring main unit
    • chance1111
    • Thread
    • answer cable calculation electrician voltage voltage drop volts
    • Replies: 17
    • Forum: UK Electrical Forum
  18. M

    2392 practical assesment - voltage drop confirmation

    hi guys, i have the 2392 practical assessment next month sometime and was wondering if anyone could confirm or remember if you have to verify voltage drop at the end of the test, I have been practising the calculations (mV/A/m) /1000 etc as well as going through the general test procedure but...
  19. J

    Really stupid voltage drop question

    Hey all, reading through the 17th trying to get my head around some areas of it. I did physics at school and some at uni so electrical calcs usualy dont bother me the slightest. BUT, If were calculating voltage drop over a reasonable length radial, for example twin and earth or SWA feeding a...
    • john2512_00
    • Thread
    • circuit conductors question really resistance source stupid voltage voltage drop volts
    • Replies: 10
    • Forum: UK Electrical Forum
  20. A

    Adiabiatic & voltage drop

    Hi all, been trying to work this out now and carnt get my head round some of the calculations. please see where im going wrong. voltage drop: so 63amp mcb supplying electric boiler, run is approx 25 meters in 16mm twin & earth. so Mv/a/m x length x amps divided by 1000= 2.8x25x63 divided by...
    • aaelectric
    • Thread
    • earth equation meter value voltage voltage drop volts
    • Replies: 28
    • Forum: UK Electrical Forum
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