Cable Designing Program (Spreadsheet)
Cable Designing Program (Spreadsheet)

Calculation of voltage drop and cable size

Motor / Electrical load

  • Calculate Voltage drop of Cable.
  • Calculate  Size of Cable.
  • Calculate Current Capacity of Cable.
Software:Cable designing program
Version:22.8.2012 New
Developer:Jignesh Parmar
Size:99 Kb
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Cable Designing Program (Spreadsheet)
Cable Designing Program (Spreadsheet)

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Page edited by E.C. (Google).


  1. Ganesh
    Oct 30, 2015

    very useful spread sheets.thanks

  2. hquocphu
    Oct 14, 2015


    PLPE resi
    4cX4 5,53
    4cX 6 3,7
    4cX 10 2,29
    4cX16 2,45
    4cX 25 1,54
    4cX35 1,11
    4cX 50 0,082
    4cX70 0,57
    4cX 95 0,41
    4cX 120 0,33
    4cX 150 0,27
    4cX 185 0,21
    4cX 240 0,16
    4cX 300 0,13
    4cX 400 0,1
    4cX 500 0,1
    4cX 630 0,1


    4cX4 8,89
    4cX 6 5,53
    4cX 10 3,7
    4cX16 2,29
    4cX 25 1,44
    4cX35 1,04
    4cX 50 0,77
    4cX70 0,53
    4cX 95 0,38
    4cX 120 0,3
    4cX 150 0,25
    4cX 185 0,2
    4cX 240 0,15
    4cX 300 0,12
    4cX 400 0,09
    4cX 500 0,09
    4cX 630 0,09

  3. cahyo widodo
    Oct 13, 2015

    Please review bout voltage in your spreed sheet Mr. Jigness Parmar for the data in value cable if we implement type of cable Lt PVC arround of range cable size 4cX70 and 4cX95, the value of voltage drop so annoying me. The value of Voltage drop if we use 4cX95 should be smaller than we use 4cX70, but there is become bigger. i have put the value but i found the miss calculation i think, pardon me. Please review and give the your best development sir.

  4. N M Venugopal
    May 29, 2015

    how do we size the cable when we have only load say 55 kW for a distribution board(3 pumps and lighting load) and at 415 v supply and a length of 400 m from source voltage to board.

  5. M G Patel
    Nov 08, 2014

    Useful information

  6. Parag Chamuah
    Oct 13, 2014

    Thanks for the work you have shared. I have few queries:
    1.How do we know what is the phase value(φ)?
    2.What is demand factor specifically?

  7. bdthang
    Jun 17, 2014

    Very useful. It help me a lot!

  8. kolumb
    Jun 10, 2014

    There is something wrong with the cable data – it’s impossible 3 different type cables with same Conductor Area, same matherial, to have 3 different Resistance (ohm/km).
    Example – look first 3 cable types – PVC flexible, PVC insulated and XLPE insulated, for the same Conductor area (by example 1cX6), both Copper, resistance for the fist is 3.3ohm/km, for the second is 3,69ohm/km and the third is 1.53ohm/km.
    May be the last one uses a super copper, twice better than first 2 :)

    Apr 21, 2014

    dear sir
    I want to submit the formulas of cable sizing to those persons which are searching here and there.I appreciate of your current website which are publishing my cable sizing ideas.I am submiting another voltage drop and cable sizing formula.

    1- Vd = 1.732 x I X L X PF/ (Area mm2 x conductivity of copper) ———-FORMULA 1
    2- Area(mm2) = 1.732 x I X LX PF/(Vd x conductivity of copper) ———–FORMULA 2

    1.732 FOR THREE PHASE.

    1.732 FOR THREE PHASE.
    I = 160 AMPS.
    L= 200 METERS.
    PF= 0.85

    Vd = 1.732 x 160 x 200 x 0.85/(70 mm2 x 41.66)
    = 16.1547 volts —————(1) for copper conductor.
    Area(mm2)b= 1.732 x 160 x 200 x 0.85/(16.1547 x 41.66)
    = 70 mm2 ———-(2) for copper conductor.

    if you want to use Aluminum conductor, apply conductivity of Akuminum which is above said.ABOVE CALCULATIONS ONLY FOR THREE PHASE.


    • Ramkumar M
      Mar 07, 2015

      How you get Area size 70mm2 ?

    • jan
      Apr 30, 2015

      i dont have a voltage drop and have only amps how did we calc the sqmm

    • Ch. Khalid Parvez Akhtar
      Jul 28, 2015

      Its a wonderful working.I must compliment you for this great work. Congratulations
      Ch. Khalid Parvez Akhtar
      Jalalpur Jattan

  10. thiru
    Apr 19, 2014

    calc is wrong.Diff cable size should apear for Al & Cu.

    • m daley
      Nov 20, 2015

      can you give me the formula for calculating cable sizes please

  11. osman
    Jan 04, 2014

    please send me

  12. Kingsley
    Jan 01, 2014

    Very useful, Thanks.

    Nov 14, 2013

    I have a query in cable designing excel spread sheet Ver.22.8.12, I would be much thankful If would get it clarified.
    In sizing of cable for motor feeder, The “KW” entry is mentioned what? It is the mechanical output or electrical input. If it is the mechanical output, the actual electrical load consumed must be output/efficiency and the actual input current is
    Full load ampere = Output power/(1.732*P.F*V*Eff)
    If “KW” Entry is actual input power then Full load ampere = Input power/ (1.732*P.F*V), Efficiency is not required in this case.
    But, in your case, the “KW” entry is multiplied with efficiency to obtain actual load consumed (May be the mechanical power output which is less than “KW” entry) and the motor amperage is calculated from the actual load consumed. In such a case loses may not be able to feed to obtain desired full load output.

    As far as demand factor concerned it (Load factor) is okay.Please clarify.

  14. Accesstel
    Sep 22, 2013

    Hi guys please let me know if we can buy these tools if they are not downloadable. I have invested 4 hours now with no success.

  15. Rajesh SV
    Sep 07, 2013

    Hi EEP members…..Am not able to download any of the spreadsheets…Plz advice.

  16. Jonesy
    Aug 09, 2013

    cannot down load!

  17. Arnon
    Jul 27, 2013

    Nice !!!!!!

  18. Donie
    Jul 23, 2013

    Useful! :)

  19. wnirut
    Jul 02, 2013

    thank you

  20. engele
    Jun 18, 2013

    Hi there,

    would appreciate it if you could send a copy of the excel file to thanks

  21. gabrielovskys
    Jun 17, 2013

    Tried but still i am not able to download the spreadsheet after login. Please kindly send excel file to……. Thank you

  22. celebrationcometh
    Jun 17, 2013

    Tried but still i am not able to download the spreadsheet after login. Please kindly send excel file to Thank you

  23. celebrationcometh
    Jun 17, 2013

    Same here. not able to download the spreadsheet too after log in.
    Please help out

  24. gurunadh006007
    Jun 05, 2013

    i want to know the logics so please provide me password for this cable designsheet

  25. sam atlantis
    May 28, 2013

    The link is not working even after LOGIN. Pls update the link.

    • Edvard
      May 28, 2013


      Make sure to enable cookies in your browser. If cookes aren’t enabled, browser doesn’t know when you’re logged in.

      I just checked, this spreadsheet has been downloaded 4763 time so far 😉

      Hope you will make it!

  26. neeraj tiwari
    Apr 25, 2013

    i am unable to download excel sheet suggest me for same.

  27. neeraj tiwari
    Apr 25, 2013

    i m not able to download excel sheet suggest me for same.

  28. GnMvP
    Dec 23, 2012

    No DC cables?

  29. Hamada666666
    Mar 30, 2012

    very good program

  30. Veeraraghavan VS
    Jan 07, 2012

    Dear Edvard,

    I tried the cable selection excel sheet. It is very good. I am giving below my observations.

      1. Why there are 2 PFs? C9 and C10 are OK. Why C15?
      2. Once a 3 Ph motor is selected, all single core and 3.5core cables may disappear from the list for selection.
      3. In the results, Starting voltage drop as % will be helpful to refer.
      4. It may be better if the TDF (Total Derating Factor) considered in selection is displayed.
      5. As a case study, i considered a 55KV, 433V, 3Ph motor. DOL Start, 0.85 Running PF, 0.3 Starting PF, 85% efficiency, 600m length, LT XLPE Al cable, 3 trays, 6 cable per tray, cables touching each other. According to my earlier calculation 3cx50 cable is not suitable – 10.23% Running voltage drop and 24.41% starting voltage drop. But this sheet is showing OK with 1.95% running voltage drop.

      The TDF considered by me is 0.674. Of course, the resistance and reactance data are from Indian cable manufacturers.
      Please let me know your opinion / observation. 3cx50 al cable for a 55KW motor in DOL starting for 600m distance – please check.

  31. Pedro Abarca
    Oct 12, 2011

    My coment is that I need a electrical software

    • jm010809
      Oct 16, 2012

      I use manual calculations since not all form of installation is covered on this spread sheet….

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