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Cable Size Calculations
Cable Size Calculations

Calculations //

Based On Motor Horse Power HP and Specified Current

Input data: Motor voltage (V L-L), Motor horsepower, Cable Temperature Rating (°C), Ambient Temperature (°C), Cable Length (ft) and Acceptable Voltage Drop (%).

Calculated Values: Operating Current (A), 125% Current per NEC (A), “Zero Length” Cable Size, Acceptable Voltage Drop (V), Actual Voltage Drop (V) and Actual Voltage Drop (%).

Note//

Conductor ampacities are based on NEC 2008, Table 310.16 (Not more than 3 current carrying conductors in racewary).

Software:Cable Size Calculations – Based On Motor Horse Power HP and Specified Current
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Cable Size Calculations

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43 Comments


  1. bd
    Nov 08, 2023

    Thanks


  2. duraimurugan
    Feb 01, 2023

    very nice


  3. fassil
    Aug 08, 2022

    to study electrical engineering


  4. Rhon jeffrey ronquillo
    Feb 23, 2021

    How can i calculate the size of wire for 40kva 3phase load?220vac


  5. Feliciano Sambo
    Mar 20, 2020

    Hi, could you please send me the Cable Size Calculation Spreadsheet?


  6. Dilip
    Aug 31, 2019

    How to calculate neutral conductor size of 1000 kva and 2000 kva dry type distribution transformer


    • Afana
      Oct 10, 2019

      How to calculate neutral conductor size of 1000 kva and 2000 kva dry type distribution transformer


  7. Vairamuthu
    Aug 26, 2019

    dear sir how can we calculate the voltage drop, any formula available for that.


  8. Sojimon Varghese
    Jul 27, 2019

    Please give me the formula of cable size calculation
    In 3 phase and single phase


  9. Sojimon Varghese
    Jul 27, 2019

    Please give me the formula of cable size calculation formula


  10. Anil Kumar dorby
    Apr 21, 2019

    How we calculate electrical load in amp single phase equipment 10000 Watt, three phase equipment 2000 watt. So total load?
    What size cable required


  11. N.K.Sharma
    Feb 18, 2019

    Nice information provided by you.,sir really helpful. Thanks


  12. MANIKANDAN SEKAR
    Dec 04, 2018

    EASSY WAY TO CALCULATE COPPPER CABLE SIZE AS PER AMPS(MOTOR FULL LOAD)

    FOR EX: 10 HP MOTOR

    3 PHASE MOTOR CURRENT DRAWS 1.25A/HP
    10 HP MOTOR FULL LOAD AMPS (1.4*10)=14A
    =14+(1.25*10HP)
    = 26A
    1SQ MM CABLE TAKING AMPS =6A
    =26/6=4.33
    10 HP CABLE SIZE = 4 SQ MM


  13. bhargav
    Jun 16, 2018

    how to calculate cable size for EOT crane’s cable.
    i.e. Motor KW:15, duty:S4, 150st/hr, 3 phase, 415V cable length 25 mtr(Festoon-Trailing cable) .
    thanking you


  14. Shivam singh
    Mar 31, 2018

    Hii Sir ,

    I am confused in Three phase wire size calculation please let me know exact formula for three phase wire size calculation with multicore and single core cable.
    For example Load Current – 45 A , Voltage drop – 3 %, Cable Lenght -10 Meter,
    Please tell me how to calculate 4-Core Copper cable size for that ? Please do needful
    Thanks


    • Karthi
      Jun 05, 2018

      You should use 25 sq mm copper wire 4 core is enough


  15. mustafa
    May 30, 2017

    hi
    lwant aske you about how calculate cable size section if it wase almunium or copper
    thank yoy so much


  16. Md. Keafayet Ullah
    Apr 18, 2017

    How can I use cable size for 440 kW load? Please suggest Me?


  17. Ram Karan Sharma
    Jan 21, 2017

    I want to know cable size. I have to install a DG set of 40 KVA capacity and length of cabling about 2000M having one outlet about 4KVA at every 10 M


  18. uduman
    Mar 11, 2016

    How can calculations electrical load schedule please send me with examples


  19. Shaker Ahmad
    Dec 21, 2015

    Very nice


  20. Joselito Ocampo Paguio
    Sep 28, 2015

    Sir, Please Can You Explain How To Get Your Answer 19Volts Voltage Drop For 3 Phase And The resistive of copper & Conductivity Of Copper 58 And Aluminum 36 Including Voltage Drop And Voltage Line For Cables Sizing Formula Calculation
    Your Most Favorable Response Is Highly Appreciated.


  21. ricky
    Sep 17, 2015

    it doesnt have a calculation for 3-phase motor.


  22. prem
    Sep 10, 2015

    how to find out the Resistivity of copper


  23. harry ojeagbase
    Apr 19, 2015

    I want to know how to determine the sizes of almond cables used in the design of smdb panel


  24. sinnadurai sripadmanabn
    Feb 08, 2015

    consider factors for duty of motor-S1,S2,S3…. and AC1,AC2,AC3 etc


  25. Dhaval Merchant
    Jul 08, 2014

    Helpful data


  26. naeem hussain
    Jun 11, 2014

    three ph formula watt/440*1.5 and single phase watt/volt


  27. DELOUR
    May 09, 2014

    Can you send me the calculation spreadsheet for ampere to Cable Size Calculations – Specified Current.with V L-L = 220V and VL-L=415V, I really need.
    Please send to my Email- [email protected]


  28. Unis Khan
    Apr 10, 2014

    Cable sizing formula calculation:-

    Data:-
    I :-Load current =160 Amps.
    L:- Length of cable in meters =200
    P :- Resistivity of copper 0.024(90 deg.C).
    Vd:- Voltage drop in 3 ph.=19volts.
    3 ph.=1.732.

    Apply formula for calculate the area of cable.
    Area(mm2)= 1.733*I*L*p/Vd
    = 1.732*160*200*0.024/19
    = 70 mm2
    Note:- 2 for single phase.
    1.732 fot three phase.

    Above said formula is perfectly correct.
    Enjoy it.

    Engr.Muhammad younas khan
    M.Sc.Engg.,MIER(UK).
    Wazirabad city
    punjab,Pakistan.


    • ENGR. SAQIB JAVED
      Jun 03, 2014

      How you calculate voltage drop in 3-PH is 19? and how it is calculated in case of single phase? My email address is [email protected]


    • vishnu
      Nov 28, 2015

      I have a one dought in apply the cable sizing formula .How u put Resistivity of copper 0.024 and this value 1.732 . If u have a any formula for that value please reply sir .
      Thanks


    • Laxminarayana arelly
      Sep 16, 2016

      Dear sir please give me lode calculations formula and voteg drop calculations and cable size calculations please give me reply sir thanku sir


  29. ENGR.MUHAMMAD YOUNAS KHAN
    Mar 02, 2014

    SIZE OF CABLE FORMULA:-
    I= LOAD CURRENT
    L= LENGTH OF CONDUCTOR (IN METERS)
    10 HP MOTOR 3PH.(10 X 746 =7460 WATTS) ,,, I = P/1.732 X 230 V= 7460/(1,732X230)
    =18,72 AMPS
    P=7460/PF=7460/0.85 = 8776.47 VA
    NOW APPLY THE CABLE SIZING FORMULA:-
    AREA mm2= 1.732 X L X VA/(K X Vd xVL)
    = 1.732 X 200 X 8776.47/(58 X 6.9 X 230)
    = 33 mm2
    LENGEND:
    I = LOAD CURRENT.
    L = LENGTH OF CONDUCTOR.(IN METERS)
    VA = VOLT AMPERE
    K = CONDUCTIVITY OF COPPER 58 AND ALUMINUM 36
    Vd = VOLTAGE DROP.
    VL = LINE VOLTAGE.

    USE ABOVE SAID FORMULA FOR CALCULATE THE SIZE OF CABLE BY EASY WAY.


    • ENGR. SAQIB JAVED
      Jun 05, 2014

      How you calculate voltage drop?


      • Kishore Kumer Debnath
        Dec 28, 2019

        Pls. share me for above answer if you found


    • Manikandan
      Jun 26, 2014

      Dear sir ,
      I have a one doupt in apply the cable sizing formula .How u put conductivity and voltage drop value . If u have a any formula for that value please reply sir .
      Thanks


  30. yu7aw
    Mar 13, 2013

    Thank you very much. It will be tremendously useful for my further activity.
    Once again, thanks a lot and all the best to all of you, guys !


  31. [email protected]
    Aug 01, 2012

    Can you send me the calculation spreadsheet for Cable Size Calculations – Based On Motor Horse Power HP and Specified Current.with V L-L = 380V and VL-L=660V, I really need.
    Please send to my email: [email protected] and [email protected]


  32. Hirenkumar
    Jun 19, 2012

    Dear Edvard,
    I found this one of the most useful site for new and experienced enginner.
    Thank you verymuch for your efforts and interest.

    Sharing of knowledge is always good.


  33. [email protected]
    Apr 10, 2012

    My security software found the following application with an exploit virus: Cable Size Calculations – Based On Motor Horse Power HP and Specified Current. Please test it and post again.


    • Edvard
      Apr 10, 2012

      It’s not virus for sure. Your security software is overreacting :) This spreadsheet as well as all the others contains VBA (visual basic for applications) part within itself that does the calculation.


  34. Sufi Shah Hamid Jalali
    Apr 08, 2012

    I am an electrical power engineer. EEP is the only place I feel comfortable in. I am really impressed by all the hard work that the whole team go through. I promise to start writing here about Renewable Energies – soon. Thank you all!

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