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niazi677
Member

Join Date: Feb 2012
Posts: 5

Motor Cable Size

02/06/2012 7:19 AM

If i have 5 KW 3 phase motor and 100 meters distance which size cable use please prove with formula
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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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Good Answers: 839
#3

Re: Cable size

02/06/2012 7:39 AM

It does rather depend upon the supply voltage and frequency. Oh, and the method(s) of installation and the ambient temperature too.

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niazi677
Member

Join Date: Feb 2012
Posts: 5
#7
In reply to #3

Re: Cable size

02/06/2012 10:14 AM

V = 480

Freqvancy = 50 Hz

ambient Temprature = 40-50 C

Impaler motor
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PWSlack
Guru
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.
Posts: 32175
Good Answers: 839
#9
In reply to #7

Re: Cable size

02/07/2012 3:28 AM

Lovely.

Plug those numbers into the reletive section of the national standard being worked to and "Robert is your mother's brother".

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Poornam
Participant

Join Date: Aug 2009
Posts: 1
#4

Re: Cable size

02/06/2012 7:54 AM

Dear Sir,

You are taking back us to our engg.college days !! Better refer to any elec data book for search for the answer. This is how you can learn the rope trick ( how to climb without any ladder- I mean any support).

S.Poornam
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Anonymous Poster #2
#8
In reply to #4

Re: Cable size

02/06/2012 10:22 AM

How did you become so poornam ?
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Yahlasit
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Join Date: Dec 2008
Location: Cd. Juarez, Chihuahua, Mexico.
Posts: 1023
Good Answers: 69
#5

Re: Cable size

02/06/2012 8:44 AM

If you were solving a specific real instalation problem, you wouldn't care about the formula because once done, you'll hardly EVER mess with it; and the command "prove with formula" proves you're cheating on an exam.

Your teacher should inspect every student and hold all cell phones, and in your case, whack your head two or three times.

No Regards this time !

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Anonymous Poster #2
#6

Re: Motor Cable Size

02/06/2012 10:14 AM

line current= ((5x1000)/(1.732xp.fxη))

but your problem is distance also included so per phase copper/aluminium = (resistance of it/metre)x100xline current + phase voltage gives source applied voltage.
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toink
Associate

Join Date: May 2012
Posts: 52
#10

Re: Motor Cable Size

05/16/2012 12:29 AM

use a 10mm2 armored cable 4core

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Users who posted comments:

Anonymous Poster (4); niazi677 (1); Poornam (1); PWSlack (2); toink (1); Yahlasit (1)

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