voltage drop

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  1. S

    Voltage drop and harmonics in multicore cables

    Hi All, Could anybody help me to understand the connection between harmonics and voltage drop in multi-core cables. I understand that voltage drop is directly proportional to the load current and length and inversely proportional to the cross sectional area of the cable. Will the additional...
  2. M

    Help With Diodes And Voltage Drop

    hi guys, im having a problem wiring some relays that need to be activated by 2 different signals, i try putting a diode on one of the signal wires so electricity wont flow thru the other signal wire, but now im having a huge voltage drop, and the relay is not activating by the wire that has the...
    • mmanzano88
    • Thread
    • diode other signal voltage voltage drop volts
    • Replies: 17
    • Forum: Auto Electrician Forum
  3. Davisonp

    Voltage Drop When Load Is Applied Question

    Hi, I came across a situation recently while investigating a problem where measuring voltage at a set of 4 sockets read 243 Volts with no load, and when a 21 Amp load is applied, the voltage then reads 230 Volts. Is it normal to have such a large voltage drop under load? Or does it imply the...
  4. D

    Voltage Drop?

    Hi this is my first time on this forum so take it easy please but I'm after a little bit of advice... I wonder if someone can help me calculate the voltage drop of an install that is in the process... I will give you as much info as possible, any help would be greatly appreciated... .400a main...
    • Dan-R
    • Thread
    • appreciated cable install panel voltage voltage drop volts
    • Replies: 3
    • Forum: UK Electrical Forum
  5. T

    Voltage drop/ Cable size query

    Hi All, Quick brain pick. If I don't care about voltage drop (eg. all components on the circuit will run between 100-250V) and current capacity is within limits, are there any other considerations when deciding to use a smaller than 'normal' cable size? 200m run - 10 x 300w loads equally...
  6. G

    using voltage drop too your advantage

    I have an install to complete where I have to take a 100amps per phase three phase supply over 330m too power a new installation. The power at source is obviously 415v (give or take) however the rating on the machine at the other end is 400v (build in Europe somewhere). I'm currently having a...
    • gavin.sibley
    • Thread
    • cable electricians vans phase power supply using van vehicle voltage voltage drop volts
    • Replies: 12
    • Forum: UK Electrical Forum
  7. D

    Voltage drop tables...

    Just a quick one folk. Do the voltage drop tables in the BGB apply for ELV systems? I'm converting my van to a camper so I'd adding 12v circuits for lighting, water pump etc. It's all going to be run in 3183Y flexible cable, can I use the VD values per mA/m in the regs, the same way as I...
  8. S

    Voltage drop

    I have a question asking how to determine the volt drop on a cable whith an unspecified length... Any clues... Anybody? :-)
  9. P

    Voltage drop workout

    Hi guys. Those who don't know me I have recently started on my own. I am testing my understanding, re Volt drop. And trying to stick to one formula. But I'm getting mixed results. My example scenario would be to feed a CU in an outhouse / shed. The CU will feed sockets, lights and some form...
  10. A

    Voltage Drop

    Hi, I am sitting in C & G 94/95 exams on 22/04/2015. i am attempting past papers and got confused regarding some voltage drop questions below: 1.Compliance with the voltage drop for a 230 v single-phase electric Kiln circuit is to be confirmed. The circuit is installed using thermoplastic 70...
  11. J

    Voltage drop for fp200

    Hi, Am running a radial power circuit in 4mm fp200 with a 20A rcbo but am a bit worried about the voltage drop. I have a 70M run clipped direct and by my calculations I will need to go to 6mm. I am using table 4d2 but don't know if there is a table for fp200.
  12. A

    Permissible voltage drop 415V three phase power circuit

    Can anyone tell me what the permissible voltage drop is for a three phase circuit serving a power circuit. Is it still 5% like for a 230V circuit. I don't have my BS 7671 to hand at the mo. Thanks in advance.
    • atm84
    • Thread
    • circuit phase power three three phase voltage voltage drop volts
    • Replies: 5
    • Forum: UK Electrical Forum
  13. N

    Voltage Drop Equation

    Hi, I've been doing some revison and came across 2 different equations for voltage drop. The first one is; Vd = mV/A x Ib x L divided by 1000 The second one is; Vd = (R1 + R2) x Ib x Multiplier The multiplier is to compensate the difference in conductor temperature at the time of the test...
  14. H

    voltage drop in 400V 3 phase circuit

    hi, can someone tell me if the volt drop max percentage for a 3 phase motor circuit is 5% of supply voltage ie 5% of 400V. thnks
  15. N

    voltage drop for a 9.5 kW shower

    Hello All, Domestic installation. Need some help please. A customer has asked me to installed 9.5kW shower. It is a new install. The cable I have decide on is a 10mm2 Flat twin and Earth. The shower is being install 24 meters from the consumer unit. The cable between the shower unit...
    • newuser31555
    • Thread
    • shower voltage voltage drop volts
    • Replies: 22
    • Forum: UK Electrical Forum
  16. HappyHippyDad

    Voltage drop and it's effect?

    Hello all, just been thinking over Voltage drop!! 1. Where does the 3% and 5% figures for voltage drop (VD) come from? Appendix 4 (BS7671) gives the figures but why the different values between lights and sockets? 2. Also permitted voltage levels are -6% and +10% from 230V giving a min of 216V...
  17. S

    Voltage drop and current drawn

    Gentlemen I have a question for your perusal. A 3kW 230volt submersible pump is connected to a long extension cable (60 metres). Approximate current drawn is I=3000watts/230volts = 13amps (ignoring PF and efficiency). Cable is rated at 0.03 volts/amp/metre therefore the volt drop is 0.03x13x60...
  18. N

    Doorbells and Voltage drop

    Hi All First posting to the forum so I hope that I've posted in the correct place. I'm looking to install a doorbell at my home in France. The distance between the bell push and the location of the bell/chime is about 40 m. I originally wanted a battery operated unit but I've been warned that...
    • Nigel62
    • Thread
    • bell voltage voltage drop volts
    • Replies: 20
    • Forum: UK Electrical Forum
  19. I

    Voltage Drop Branch of radial circuit

    hi guys Need some help in calculating voltage drop on a branched radial circuit. (13A design load 2.5mm cable)( cu to junction box 8m 2.5mm) for a standard loop in loop out radial it would be IbxDxmV/m/1000 this circuit has 2 branches from the junction box one/ 10m long ( 1 double...
  20. J

    "Voltage Drop" Please help!

    Hi folks Iknow this topic has been beaten to death on this forum but after reading some of the posts and speaking to some of my co workers I am still a littleconfused, I am aware there is several ways of calculating voltage drop but amstill unsure of when to use the correction factor of 1.2 and...
    • johnohagan
    • Thread
    • arial black center help! please voltage drop volts
    • Replies: 3
    • Forum: UK Electrical Forum

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