voltage drop | Page 6

voltage drop

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  1. 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...
  2. 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".
  3. 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...
  4. 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
  5. 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...
  6. 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...
  7. W

    Voltage drop allowances for distribution circuits

    has anyone got any good guidance or information on how they design/allowance for voltage drops for distribution circuits and also how they calculate the V/D for distributed load circuits such as ring/radial socket circuits and lighting circuits I cant really find anything in the usual books...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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:
  13. 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...
  14. 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??
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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