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drajesh1985
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Join Date: Feb 2008
Posts: 18

cable size calculation

04/23/2008 2:20 AM

i have seen people calculate the cable size depending upon the amps rating. but i need the basic calutation method mathematically.

if there is any simpler method to calculate.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: cable size calculation

04/23/2008 3:07 AM

Please refer to the latest edition of the Wiring Regulations, maintained and published by the Institution of Electrical Engineers.

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pantaz
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Join Date: Feb 2008
Location: Van Nuys, CA
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#2

Re: cable size calculation

04/23/2008 4:19 AM

Physics of Conductors and Insulators
http://www.faqs.org/docs/electric/DC/DC_12.html
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jeyaraj
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Join Date: Apr 2008
Posts: 1
Good Answers: 1
#3

Re: cable size calculation

04/25/2008 3:21 AM

for selecting the cable size, three parameter has to check

Step1:

01. current rating - As per the current rating mentioned in the catalouge, we will select the cable size after necessary derating.

02. voltage drop- Secondly, the selected cable size has to deliver the voltage to the motor with in allowable voltage drop( 3%). for that we will calculate the voltage drop by following basic formula

voltage drop = √3.I.Z.L

I- current in amps

Z- impedance of the cable

L- length of the cable

03. short circuit - Next, we have to check for the short circuit rating
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Previous in Forum: Software for Making Electrical Circuit Drawings   Next in Forum: kwh METERS
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