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For the motor which had 50Hz 2.2KW 400V 4.59A. how I select my cable size? and according to what standards?

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تم إضافة السؤال من قبل Mahir Al-Shabibi , Maiteneace Technician , British Petroleum Company
تاريخ النشر: 2015/03/12
Nazar Mohd. Karyar
من قبل Nazar Mohd. Karyar , Assistant Professor in College of Enginering, Kabul University , Ministry of Higher Education

For Cable design we use these two formulas::

 

For Single-phase

VD =2 x K x I x D/CM

For Three-phase

VD =1.732 x K x I x D/CM

VD ===> voltage drop, from code:3% -5%

K =12 for copper21 for Aluminum

D = Length in feet 

CM = Circular mil

I = Load current

 

I dont think the given parameters are sufficient for the selection of cable for a3p motor.  the length between the motor and power supply is to be known to calculate the voltage drop on the cable..as distance increase, voltage drop also increases. Standards can be what that is followed according to the country in which you do the work, most preferred  IEC. but im not sure

   

Mahir Al-Shabibi
من قبل Mahir Al-Shabibi , Maiteneace Technician , British Petroleum Company

The Power Supply :50Hz 415V 3P+N

Mohd Abdullahi
من قبل Mohd Abdullahi , TECHNICAL OFFICER 1 , H&H ENGINEERING LTD

Abhilash Eapen Joseph  IS CORRECT.

IF U HAV THE CURRENT RATING OF THE MOTOR AND VOLTAGE DROP BETWEEN THE SUPPLY AND THE POINT OF UTILIZATION,D REST IS EASY.

ahmed mohamed elsayed bayoumi
من قبل ahmed mohamed elsayed bayoumi , مهندس اول كهرباء مكتب فني وموقع , RANDA CONTRACTING COMPANY

Asper nec code art430 First go to nec table430.248 if single phase motor. Or430.250 if3 phases motor at voltage and horse power you can select flc or starting current Second step to calculat cable size: flc *1.25 you will get the minimum ampere for cable Third step go to cable catalogue as saudi cables and choose proper cable size If you want to select breaker flc*2.5 and you will get maximum over current protection take the next breaker standard

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