voltage drop

  1. S

    Voltage Drop

    Hi all, I've got a job to do regarding an outside supply to a summer house. The easiest route is to pick power up from a car porch. This small board is fed from the house on 2.5mm, which is approx 15m from the main board. Unfortunately the cable is under a driveway and simply installing a...
  2. N

    Voltage Drop

    We are all familiar with the requirements for measuring Zs and verifying that it is within the limits for the particular type of protective device. I use a single guide of 1.2 ohms as the maximum though there are of course many variations. What we (I) have not been noting is (R1+ Rn) and the...
  3. Golden_Boy

    Voltage Drop

    Why all the complicated formulea for working out voltage drop? Why not just connect the load and measure the voltage with a meter?:confused:
    • Golden_Boy
    • Thread
    • aus cable circuit length maximum voltage voltage drop volts
    • Replies: 19
    • Forum: Australia
  4. C

    OSG Final Circuits voltage drop table question

    Just been flicking through and table 7.1 to enable final circuits to be installed without calculating voltage drop has one of the criteria as ii)The final circuit is connected to a dis board or CU at the origin of the installation Just seeing that I understand this and the reasoning behind...
  5. E

    Voltage Drop

    When looking for a new radial circuit for a extension i came across a cable that was used for the old boiler. So thought bingo use this. So checked the breaker and it was the correct circuit. I then put my mtr on it and i got 210 volts. Why is their a voltage drop ?
  6. S

    voltage drop

    Hi There, I wonder if any of you guys can explain to me why the voltages dropped across the choke and the flouirescent light dont add up to the supply voltage. I have got a little test to do at college where you have to measure the current and the voltage in a flouriscent light circuit , all...
    • snowplough
    • Thread
    • aus light supply voltage voltage drop volts
    • Replies: 1
    • Forum: Australia
  7. D

    Voltage drop

    Hi guys I wonder if someone can give me a bit of their advice. I have a customer who owns a medium size factory, he wants me to install a two sounders 230volt in an area so it warns people that there is a heavy vehicle coming, operated by a switch in the same area, by personel who are given...
  8. D

    voltage drop

    tested a circuit and its measured voltage was 218V. No where near the calculated VD. Any suggestions on what the Maximum permissable VD is . cheers
  9. I

    voltage drop

    with the value for volts Mv x Ib x l/1000 7.3 x 39 x 28/1000 = 7.97 V how can i comfirm this value is acceptable??? any help would be great :cool:
    • iceman
    • Thread
    • aus breaker cable table value voltage voltage drop volts
    • Replies: 9
    • Forum: Australia
  10. T

    What is the voltage drop?

    Could you tell me what is the voltage drop across a 470W resistor conducting a current of 15mA? That is, if R = 470W and I =15mA, what is the value of V? Could you tell me how can you get the answer?
  11. H

    Voltage drop

    How do we calculate voltage drop on a ring final sockets only, Given the length of the circuit is 40 meters the cable is 2.5mm so therefore the amp per meter is 18, the mcb is 32 so is it 40 x 18 x 32 / 1000 = 23.04 but thats more than 5% = 11.5. Do we not use the mcb for socket outlets as we...
    • hogan
    • Thread
    • aus cable circuit length maximum table voltage voltage drop volts
    • Replies: 3
    • Forum: Australia
  12. S

    Voltage Drop Of DC Resistors

    Im currently doing a electrical course at college and im stupidly stuck on the most simple question. Due to my teacher not being the most approachable i thought id ask here for help, heres the question; http://img205.imageshack.us/my.php?image=71997536ox1.jpg Im asked to calculate the amps and...
  13. L

    Problem: Voltage Drop...?

    I was asked to solve this and I was wondering if I was going about solving it in the proper manner so wanted some info and hoping I could get some help. There is a voltage of 120V, and resistance of 16 amps at the start of the ground connected to the breaker. The wire goes into the ground and...
  14. N

    IEE Regulations Voltage Drop

    Hi, To calculate the voltage drop of a cable from Appendix 4 of the IEE Regulations we use the following formula: actual voltage drop = factor x load current x length 1000 My question is that i tried to solve some problems regarding the current...
  15. T

    Testing Voltage drop using circuit impedance

    Ok guys got my head in the 17th edition New bit in Part 6 Inspection and testing (used to part 7 in 16th) 612.14 - "the voltage drop may be evaluated by measuring the circuit impedance" :eek: managed to find the same query on another forum, and lots of views on there about how you would...
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