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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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23 Comments


  1. uduman
    Mar 11, 2016

    How can calculations electrical load schedule please send me with examples


  2. Shaker Ahmad
    Dec 21, 2015

    Very nice


  3. 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.


  4. ricky
    Sep 17, 2015

    it doesnt have a calculation for 3-phase motor.


  5. prem
    Sep 10, 2015

    how to find out the Resistivity of copper


  6. harry ojeagbase
    Apr 19, 2015

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


  7. sinnadurai sripadmanabn
    Feb 08, 2015

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


  8. Dhaval Merchant
    Jul 08, 2014

    Helpful data


  9. naeem hussain
    Jun 11, 2014

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


  10. 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- delour07@gmail.com


  11. 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 saqibjaved786@hotmail.com


    • 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


  12. 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?


    • 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


  13. 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 !


  14. mashadi.manurung@yahoo.co.id
    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: mashadi.manurung@orica.com and mashadi.manurung@kni.co.id

  15. […] for harmonic currents in four-core and five-core cables with four cores carrying currentThe basic calculation of a cable concerns only cables with three loaded conductors i.e there is no current in the neutral conductor. […]


  16. 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.


  17. intoko@racsa.co.cr
    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
      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.


  18. 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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