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voltage drop

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  1. F

    Calculating Voltage Drop on a Ring main

    Hi Guys, I'm fairly new to the industry and have sat and passed all the relevant exams to become a Domestic installer. I'm a little stuck with one of my pieces to be assessed by NICEIC. I'm doing a full rewire at my dads house and would like to check that I'm calculating the cable volt drop...
  2. Baker1988

    voltage drop calculations

    hi was wondering what every ones opinions are regarding volt drop calculations i know there are 2 ways the ohms law way and the way where you use tables of the bs7671, the thing is i taught my self how to do volt drop calcs so i learnt the ohms law way is this a acceptable way or should i do it...
  3. S

    Voltage Drop on cabling

    Good morning All, Ive been asked to work out the potential volt drop on 12 metres of 10mm x 7 core SWA powering a 45kW (60hp) motor. Just to check my findings as below, please could someone confirm whether I have done it right. 45kW - 80amp FLC as using Star Delta Starter multiply by...
  4. M

    Voltage drop calculator

    Need advanced voltage drop calculator
  5. C

    voltage drop calculation

    i want to know the formula for voltage drop calculation for 3 core x50mm2 hv cable feeding 1000kva transformer 13.8kv. the cable is xlpe ,armored..it is connected from Ring main unit
  6. M

    2392 practical assesment - voltage drop confirmation

    hi guys, i have the 2392 practical assessment next month sometime and was wondering if anyone could confirm or remember if you have to verify voltage drop at the end of the test, I have been practising the calculations (mV/A/m) /1000 etc as well as going through the general test procedure but...
  7. J

    Really stupid voltage drop question

    Hey all, reading through the 17th trying to get my head around some areas of it. I did physics at school and some at uni so electrical calcs usualy dont bother me the slightest. BUT, If were calculating voltage drop over a reasonable length radial, for example twin and earth or SWA feeding a...
  8. A

    Adiabiatic & voltage drop

    Hi all, been trying to work this out now and carnt get my head round some of the calculations. please see where im going wrong. voltage drop: so 63amp mcb supplying electric boiler, run is approx 25 meters in 16mm twin & earth. so Mv/a/m x length x amps divided by 1000= 2.8x25x63 divided by...
  9. 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
  10. 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...
  11. P

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

    hi guys, what is the cause of voltage drop within an electricinstallation?
  12. 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
  13. 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...
  14. 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...
  15. 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
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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