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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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Size:73.5 kB
Price:Free
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Cable Size Calculations

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Page edited by E.C. (Google).



9 Comments


  1. 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.


  2. 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.


  3. 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 !


  4. 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

  5. [...] 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. [...]


  6. 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.


  7. 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.


  8. 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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