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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Page edited by E.C. (Google).

17 Comments


  1. harry ojeagbase
    Apr 19, 2015

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


  2. sinnadurai sripadmanabn
    Feb 08, 2015

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


  3. Dhaval Merchant
    Jul 08, 2014

    Helpful data


  4. naeem hussain
    Jun 11, 2014

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


  5. 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


  6. 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


  7. 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


  8. 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 !


  9. 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

  10. […] 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. […]


  11. 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.


  12. 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
      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.


  13. 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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