## 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 |

Version: | – |

Developer: | – |

Size: | 73.5 kB |

Price: | Free |

Download: | Right here | Get Download Updates | Get Technical articles |

uduman

How can calculations electrical load schedule please send me with examples

Shaker Ahmad

Very nice

Joselito Ocampo Paguio

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.

ricky

it doesnt have a calculation for 3-phase motor.

prem

how to find out the Resistivity of copper

harry ojeagbase

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

sinnadurai sripadmanabn

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

Dhaval Merchant

Helpful data

naeem hussain

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

DELOUR

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

Unis Khan

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

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

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

ENGR.MUHAMMAD YOUNAS KHAN

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

How you calculate voltage drop?

Manikandan

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

yu7aw

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 !

mashadi.manurung@yahoo.co.id

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

Hirenkumar

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.

intoko@racsa.co.cr

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

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.

Sufi Shah Hamid Jalali

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!