voltage drop

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  1. M

    voltage drop

    I am about to instal a new lighting circuit in an extension with vaulted ceilings. I have calculated the length to be about 100m, and have worked the voltage drop with 1.5mm cable to be 12.18 using the calculation of: 29(from table 6e2) x 4.2(design current) x 100(length) all divided by 1000. Is...
    • macloon
    • Thread
    • aus cable circuit circuits electricians' talk lighting table voltage voltage drop volts
    • Replies: 16
    • Forum: Australia
  2. 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 calculate compressor electricians' talk gas how to roman starting times voltage voltage drop volts
    • Replies: 8
    • Forum: Australia
  3. P

    Dimming Lights & Voltage Drop when using 12kw shower.

    Hi guys, Recently installed a 12kW electric shower for a customer. Customer has called me back because the lights dim quite noticeably every time he uses it. Took some readings at the CU Main switch. Shower off = 248V, shower on = 236V, a voltage drop of around 12V (although still in...
    • puranah69
    • Thread
    • aus dimming electricians' talk lighting lights shower using voltage voltage drop volts when
    • Replies: 20
    • Forum: Australia
  4. P

    Voltage Drop and Regs-how do you do it?

    Hi All wonder if anyone can help just wondering how sorting out voltage drop works in practice the regs say that this can be worked out using the Zs or using diagrams. Any idea how this is done in practice?:6:
  5. C

    Voltage drop calcs

    Hi Could someone kindly put me in the right direction for voltage drop in cables. I have the formula from OSG (mV/A/m) x lbxL divide 1000 but cant get my brain to kick in and piece everything together. There is very little in 7671 unless im looking in the wrong part. Do I require tables for the...
  6. N

    Voltage drop??

    Hi Just a quick one does anyone know were you can get those voltage drop kits ( like the one used on diy SOS about size of a consumer unit) and if so how much they are? Also what's it roughly save the coustomer per year??
  7. Worcester

    AC Voltage Drop 250m run

    We've got a site where we're installing a 50kWp (3 phase) system on a barn and then feeding the main buildings 250m away. I've just gone through the BRB, and allowing for both the operating temperature and load factor, I got results of 95mm2 Cu and 120mm2 Al - this seems a bit on the large...
  8. E

    Need Explanation of Voltage Drop Please...

    The calculations for Voltage drop as described in the IEE Regulations book is shown below: The actual voltage drop is given by: mV x Ib x l 1000 = 7.3 x 37.4 x 24.5 1000 = 6.7 V (well below the maximum of 11.5V) This voltage drop, whilst not causing the kiln to work unsafely...
  9. M

    Voltage drop to sub main.

    I need to feed a new board 50m away. Iv been doing clacs 16mm drops 7.2v over this distance. Is voltage drop to point of origin? Does this mean im going to end up using 25mm? Sorry if am being stupid,been there for hours and had info overload today :S Hes got 2 water supplys in his house(not...
    • mattmoo1974
    • Thread
    • aus electricians' talk going main socket sub main supply voltage voltage drop volts
    • Replies: 19
    • Forum: Australia
  10. S

    AC cable run 100m info on voltage drop

    i have been asked to pv quote for a barn which is 100 meters away, there is a 16mm cable running down to the barn, my question is according to the sma software the voltage drop is 3.74v the power loss is 63 Watts is this ok, i know the dti says you should try and keep the voltage drop below...
  11. P

    Calculating lb and voltage drop

    Pre empting my 2382 and trying to calculate lb so as I can calculate voltage drop. Circuit I have used for this is an upstairs lighting circuit, 1mm2 t&e 4 light points and length of approx 19m. Cable installed to ref method C. Getting myself a bit confused but this is what I think I...
    • Penance
    • Thread
    • apply aus cable calculating diversity electricians' talk round voltage voltage drop volts
    • Replies: 41
    • Forum: Australia
  12. C

    Voltage Drop Tolerances

    Hi I have been asked to provide power to a building at the foot of the customer's 30 metre garden (32A ring and 6A lighting circuits). When I calculate the required cable size in terms of voltage drop, 6mm SWA is just over limits. I am using 6.4 mV/A/m 36A Demand and 30 metre run...
    • Colonel Hathi
    • Thread
    • aus cable circuit electricians' talk lighting voltage voltage drop volts
    • Replies: 17
    • Forum: Australia
  13. C

    Voltage drop on a ring?

    Morning, Just a quick question? In the OSG (2008) (page 44), it says that you can have 106 metres of 2.5 T&E with a 32A type B cb. Any ideas how they are working this out? My understanding of vd on a ring is mvam x half of length x half of ib / 1000 So 18 x 53 x 16 / 1000 = 15.2 v?? I assume...
    • CRAIGNEWHAM
    • Thread
    • aus chris electricians' talk equation london ring voltage voltage drop volts
    • Replies: 8
    • Forum: Australia
  14. R

    voltage drop.

    6.9 v for lighting 11.5 for a socket. So my question is to calculate the size of a supply cable to a building that had lighting power heating for example. What figure would i use for voltage drop. Is there a wxtra safe rule of thumb method ppl use?
    • Robo
    • Thread
    • cable circuit electricians' talk figure lighting voltage voltage drop volts
    • Replies: 5
    • Forum: Talk Electrician Forum
  15. A

    Calculating the voltage drop across a PVC insulated cable- 35mm copper conductor

    I am adding a new Air handler panel to a building and its load is 5421KVA. How do I go about getting the the start up current when the phase voltage is 240V? On obtaining the Start up current, now how do I calculate the voltage drop when the cable that I am thinking about using is the 35mm sq...
  16. T

    Voltage drop help please!

    Hi, i am confused about how voltage drop is worked out and need an answer for the following please; Work out cable size and cpc size you need when you have: Cable length = 50 metres Ib = 32Amps to get a voltage drop that complies with regs i.e. below 5%(11.5 Volts). It's wired in singles and...
    • ta-electrical
    • Thread
    • aus cable electricians' talk formula guide help help please please value values voltage voltage drop volts
    • Replies: 3
    • Forum: Australia
  17. R

    Voltage drop

    Iv been calculation voltage drop. Could some see if what im doing is correct. So from looking in the regs i have found that your aloud 6.9v voltage drop for lights and 11.5v for sockets etc. S i take it that i need to go buy the 6.9 v as i have lights??? Im intending on feeding a new board...
    • Robo
    • Thread
    • aus electricians' talk lights socket tahoma voltage voltage drop volts
    • Replies: 13
    • Forum: Australia
  18. C

    3 phase voltage drop tables

    If you have a 50A 3 phase MCB, that's 50 per phase - when calculating voltage drop using the tables do you calculate using 50A or 150A? ie 10mm cable carrying 50A 3 phase over 30m VD=3.8x50x30 / 1000 = 5.7V or VD=3.8x150x30 / 1000 = 17.1V I think it has to be the first but am a bit mixed...
  19. E

    Voltage drop calculation format

    VOLTAGE DROP CALCULATION FORMAT hi my friends, is anybody have voltage drop calculation format? AND THERE BEEN SOME CHANGING OF OPINIONS AND ADVICES AS FOLLOW 1ST REPLY Shabu there's a few ways of calculating volt drop, the vast majority provide you with an "average" assuming the load is...
  20. D

    Voltage Drop issue

    hi guys trying to get the right table in the BS7671 book and the On site guide, regarding wroking out my CCC and VD.... I worked out my design for my shed, its going in twin and earth flat, in round conduit. Looking in the BS7671 it looks to me that is a Method B. There isnt a method b...
    • danny124
    • Thread
    • aus cable circuit current electricians' talk issue method voltage voltage drop volts
    • Replies: 6
    • Forum: Australia
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