volt drop

volt drop

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  1. S

    exceeding voltage drop

    hey guys we have done an EICR on a 2 bedroom bungalow, the supply is a 25mm 4 core 3 phase SWA to the property, it is supplied from 80amp fuse. although it is speculative as the cable is underground we reckon the distance is around 600m :fearscream:. it has being installed around 10 years and no...
  2. S

    Do the voltage drop and fluctuation occur?

    Hello, We have a mini split AC Inverter. We need electrical wire for the second mini split AC inverter. Can we get a wire branch from the first AC terminal? Do the voltage drop/sag and fluctuation occur?
  3. J

    Volt drop question and advice

    Hi, I'm looking for a bit of advice on a volt drop query we have in our office. I'll explain the scenario and I would really appreciate any opinion's and advice. We were asked to wire a 3ph 100A supply into a barn, that would later be used to feed a new build house. The meter and supply comes...
  4. O

    Volt drop, lighting v non lighting

    Why is this still a thing, just done a quick calculation with the TLC volt drop calculator and if its a non lighting circuit the recommended size is 6mm but if there is lighting its saying 10mm. Quite a cost difference. I get this in the olden days when there were filament lights that would go...
  5. HappyHippyDad

    Understanding 3 phase volt drop.......

    I am trying to understand 3 phase volt drop. I understand single phase VD. Lets say we have a 70 meter run of 35mm, 5 core cable from the supply to the 3 phase consumer unit. From the 3 phase consumer unit we have 1 x 16A triple pole MCB (so that's 16A per phase). which has a run of 12metres...
  6. M

    Volt drop calculation on spurs off of a ring.

    Hello, New trainee electrician so sorry if this is a dumb question I feel confident with calculating the volt drop for a ring and radial circuit but am getting confused when in comes to incorporating a spur and and just wanted some help to confirm if I am calculating the volt drop at a fuse...
  7. I

    Volt drop calculations

    Just curious as to when people are calculating volt drop, how close you allow your calculations to get to the 3% and 5% values before you decide to up the cable size? For example, if your calculations brought you to 11V for a general circuit would you be OK with that?
  8. D

    UK Resistor for volt drop

    Hi Guys I was asked to look at a twin extract fan system that was showing a trip fault after checking that both fans ran by temporarily bypassing the fan controller after further investigation I found that a resistor was in serious with a bridge rectifier The dc side of the rectifier is...
  9. S

    Hot tub volt drop

    Can i get away with 6mm SWA on a 50m run for a 32a supply to a hot tub? Cable will be burried. I believe its very close to being over the 5% max Permitted? Whats your thoughts, should i go up to 10mm? Thanks
  10. HappyHippyDad

    Calculating volt drop on 24v, supplying LED lights.

    I'm getting a little confused about volt drop and 24v. I want to fit an LED strip light. 8m of lights 7w/m. It would be easier to have the 24v driver approx 10m from the beginning of the strip of the LED strip. I'm not sure where to start to know if this will work without any effect on the...
  11. G

    Help me work out volt drop please....

    Hi all, I am currently doing my 2391-52 and have been given a mock paper, one of the questions is around vold drop as per below, can someone please help me understand how to get the answer as I just cant seem to work it out! Thank you advance! Voltage drop of a single-phase distribution...
  12. D

    Volt drop on a USB???

    Evening all I’m looking for a little advice here as I have bit of a weird one here. I got called out to a client to look at some computers that they have reported to have the keyboard and mouse not working and for short I’ll just use KB and M. So a few other people have had a look at this...
  13. J

    Quick Volt drop Q re Table 4ab P 383 Regs Book plz

    Hi I am being thick i am sure. I am doing some pre work on an EV charging course i am doing in November. I got to a part mentioning volt drop and ref in the regs book. Not looked at this for a while, so i thought i better check it out. Table states figures for Public Supply and figures...
  14. Bear

    Select (Scottish) Certification Scheme Question on volt drop from 2391

    Hi all, I have worked out the volt drop on other questions using the formula mVxAxM. had no issues, but this question below has just fried whats left of my brain, I have the answer because i got it wrong, but how do you work this one out?? Being Dyslexic i do sometimes read the questions all...
  15. Dan Carroll

    Volt drop maths

    Morning team Question about volt drop. I presume I am missing something here. So firstly the facts out the OSG. Table 7.1, page 66, lighting circuit, 6 amp, RCBO protection, 1.5mm cable. The max allowed length is stated as 106m. Using table F6 for the cable info, for 1.5mm cable the mV/A/m is...
  16. bigspark17

    Float switch wire volt drop

    Hi guys and gals. a job that has got me second guessing my calculations. I have been asked to fot a float switch to a pump not a problem but the distance is 525m. Now there is no load on the float switch as i will be using a contactor to switch the pump Locally. So can i use a small 1.5mm 2c...
  17. J

    Voltage drop on rgb LED strip

    Hi! I’ve installed an rgb strip light to a friends house with a dropped ceiling and I did expect some voltage drop but not as bad as it is, the problem I have is 1. I have ran 2X 2 core 0.75mm2 cable from the carcass unit where all the sockets and less driver is in, into the wall and comes up...
  18. N

    Max volt drop for 25mm or 35mm feed to sub CU

    How does max volt drop for 25mm or 35mm feeds to sub CU work. Do we for example allow only 1% drop on the 25/35mm so we can keep 2% drop for lighting circuits and 4% for power circuits, or is there any where else in the regs that gives specific figures on maximum allowed volt drop? Any...
  19. P

    Volt drop calculation and cable size

    Hi A good friend of mine is having a large electrical installation carried out in his garden.Hes had 3 prices from various electrical contractors regrading the install. He is having a summer house built that will house 9kw 3 phase sauna 5kw hot tub 27kw 3 phase electric boiler A 32 amp ring...
  20. S

    Doorbells again - volt drop / max bell wire length

    Hi Folks I've been trying to work out whether a doorbell will work with approximately 16m run of bell wire. I've tried to find out volt drop, resistance (to calculate volt drop), or even CSA of typical bell wire. But no luck. I tested an approx. 3m length with my MFT and got 0.87 Ohms. That...

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