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What is Calculation of electrical cable size?

Electrical Maintenance
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Question added by حازم عبد الحميد محمد دياب , technical office manager , Kased Khair
Date Posted: 2014/04/05
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حازم عبد الحميد محمد دياب
by حازم عبد الحميد محمد دياب , technical office manager , Kased Khair

CABLE.SIZING.FORMULA::2*L*I/(K*Vd)...............FOR.SINGLE.PHASE I……..LOAD.CURRENT.=160….AMPS L…….LENGTH.OF.THE.CABLE.= 200 METERS K……CONDUCTIVITY.OF.COPPER.=.58,AND.CONDUCTIVITY.OF.ALUMINUM.=36 Vd:- VOLTAGE DROP3% OF230 VOLTS=6.9 VOLT AND FOR3PH.3% OF400VOLT=12 VOLTS APPLY.THE.FORMULA:- AREA(mm2) =2 * L * I/(K * Vd) =2 *200*160/(58*6.9) =159.92 mm2 required(FOR SINGLE PHASE) AREA(mm2) =1.732*L*I/(K*Vd) =1.732*200*160/(58*12) =79.6 mm2 required(FOR THREE PHASE)

mohammad nadjafzadeh
by mohammad nadjafzadeh , Electrical Design Engineer , Mobadel Negahdar

you should use relations and formula  in standards and be aware of voltage drop and heat effect. each cable has its own detaile and Specifications. 

اسامة الصاوي
by اسامة الصاوي , Head of maintenance department , alfa group

it is a right answer hazem

Emad Shahine
by Emad Shahine , Technical Leader II , Fan Projects SAL Offshore

We can calculate the size of the cable we need , using this formula : S= I / D S : Section of the cable. I : Intensity , which is the current in Ampere. D : Density, which is theoretically equal to5 and for safety we consider it3.

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