voltage drop

  1. A

    Voltage drop

    Hi i keep getting confused when trying to work out voltage drop please can some one point me in the right direction. 63amp boiler supply 25 meter run in plastic trunking fixed to wall. Will 16mm twin and earth be sufficent and can someone show the calculation cheers
    • aaelectric
    • Thread
    • boiler cable conductor current value voltage voltage drop volts
    • Replies: 7
    • Forum: UK Electrical Forum
  2. P

    Circuit design - voltage drop

    Hi all Scenario: Small 2 bed terraced house. Ze 0.70 ohms on a TNS. One RFC ,PD 32amp type B. RCD protected. Outdoor socket and lighting required in small rear garden. Spur from kitchen socket to take power outside for one IP66 double socket and from there to 3 lights via FCU IP66 (3 amps...
  3. P

    What is the cause of voltage drop within an electric installation?

    hi guys, what is the cause of voltage drop within an electricinstallation?
  4. P

    method for measuring the voltage drop

    hi, if we need to measure the voltage drop from a main cu to a sub cu in a outbuilding, what method can be used to verify the voltage drop
  5. P

    Voltage drop and ZS - Some thoughts

    Hi all The scenario: Garden power supply to be taken from a 13am FCU spurred from a RFC. It then goes off to a double socket and lighting etc. No grief there. (RCD protection on RFC BTW!) The spur is protected by a BS1363 13amp plug top fuse. Which ZS max do we use? Is it the ZS from the 13...
  6. D

    Voltage drop on domestic lighting circuit

    Hi all , at work today I was doing some live testing on an existing installation all readings were fine until I came to the lighting circuit . At the last light I was taking a ZS reading and the voltage reading was coming up as 140-146 volts I then checked all lights on the circuit and got the...
    • dan35
    • Thread
    • circuit domestic lighting lighting circuit voltage voltage drop volts
    • Replies: 4
    • Forum: Domestic Electrician Forum
  7. i=p/u

    voltage drop issue to be or not to be

    i have a heating ciruit to install soon and the distance from time clock to boiler is maybe 30-40M would there be a voltage drop issue with .75 flex. does anyone know the mv/A/m for .75
    • i=p/u
    • Thread
    • answer documents everything issue voltage voltage drop volts
    • Replies: 8
    • Forum: UK Electrical Forum
  8. P

    Voltage drop

    Hi all If an outdoor circuit comprises 2.5mm SWA running to adaptable box where it then splits into 2 x 1.5mm SWA cables for lighting, socket etc. how is the VD calculated? I presume the VD for the 2.5mm run is calculated up to the adpatable box and added to the 1.5mm VD for each additional...
  9. S

    Voltage drop on lighting circuit in warehouse

    Hello All! I was hoping to have some help from some of the savvy bunch if at all possible? I am currently pricing a largish job for a client of mine. It involves changing some warehouse lighting (currently fluourcesents to 400W metal halide low bays. The warehouse is 75 meters long, and...
  10. A

    voltage drop

    If im running an armoured cable to a garage that is to be converted to living accomadation, i was thinking of running a 6mm armoured cable out of the original house clip along the wall outside and into the garage conversion to a small 2 way sub board. do i simply work out the VD of the 6mm cable...
    • ample current
    • Thread
    • cable conversion garage running voltage voltage drop volts
    • Replies: 1
    • Forum: UK Electrical Forum
  11. A

    Voltage drop for outside lights

    I need to fit an armoured cable to feed a few outside lights the run is 130m and the load will be 6 amp. from the OSG i can see that 2.5mm multicore pvc single phase will drop 18mV, 4mm 11mV and 6 7.3mv ive done the calculations mV x 6 x 130 / 1000 = 14.04V mV x 6 x 130 / 1000 = 8.58V mV x...
  12. B

    Distribution of load on a ring final for Voltage drop calcs?

    Just pondering my voltage drop calcs for a fused spur off a ring final. Additional circuit will be around 15-20m long so I though I should do this properly.... My problem is calculating the voltage drop in the existing ring to the point of the spur which of course depends on distribution of...
  13. S

    Ambient temps and voltage drop.

    Hi guys, Can somebody please help me out with the correct voltage drop on a 120mm 5core double insulated cable non armoured, on a 208v system , lay surface for a run of 10m. It has an ambient temp of 90 degrees / no thermal insulation and is being protected by 250A 3pole 60947-2 main sw. I...
  14. D

    Bit of help on voltage drop

    hey there. just a bit of help needed lads. ive got to run a swa cable approx 100metre out of back of a farmhouse (clipped direct around 2 metre out of house) then run around 80 metre down a field some of cable underground other parts just run down side of garden probably slighty dug in at...
    • deadmanlufc
    • Thread
    • cable going help voltage voltage drop volts
    • Replies: 33
    • Forum: UK Electrical Forum
  15. TaffyDuck

    Voltage drop taken to extremes

    Just been asked to go and check out a new agricultural barn wired up by a builder. The barn is 350m from the house ( where they have fed it from a socket in the living room) and they have fed it with 1.5mm two core SWA." because its only a socket and a couple of lights".
    • TaffyDuck
    • Thread
    • aus figure problem socket taken voltage voltage drop volts
    • Replies: 22
    • Forum: Australia
  16. R

    Calculating voltage drop on larger SWA cables

    Hi All A question I've asked many a lecturer and none of them have come up with the same answer. When looking at the current carrying capacities for SWA cables, from about 35mm onwards you get an r, x, z value. What are these and which one do you use when carrying out voltage drop...
  17. B

    voltage drop calculations

    I have been asked to connect up a mobile home on a large transportation site. The run of cable is approximately 250meters. In the regs book for 25mm armoured cable there are three values x y and z which one should I use
    • big willie
    • Thread
    • aus cable calculations large voltage voltage drop volts
    • Replies: 4
    • Forum: Australia
  18. A

    Voltage drop

    Hi, I'm a first time user of the forum. I am trying to calculate the voltage drop to determine the cable to use for garden lighting. I have a run of 300m from the fuse board to the last light on the circuit. The total wattage of lights that will run off this circuit is 1000w. I will be using...
  19. E

    ring design and voltage drop

    Hi guys. Ive generally no problem going through the deign process of cable selection for a circuit to be installed, (i try keep my hand in now and then rather than just looking in the OSG) but when i look at a RFC as in appendix 15, i get a little stuck. Ib = 32A, so In = 32A breaker, take it...
  20. L

    how to calculate and avoid the Voltage drop at starting of gas compressor

    In a gas power plant There are 2 main transformers ( st1 , st2 ) taking from the grid 380 kv and step down to 13.8 kv ,and then feeding the main bus which it is divided into 2 buses ( A Feed by st1 , B Feed by st2 ) between them bus tie st1 = 380 kv/13.8 kv st2= st1 Bus A feeding gas...
    • live11
    • Thread
    • aus avoid building calculate compressor feeding gas how to plant starting voltage voltage drop volts
    • Replies: 1
    • Forum: Australia
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