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Amitsonpethkar
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Join Date: Oct 2011
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Cable Sizing

05/16/2013 3:34 AM

Did any one has cable sizing calculator for AC and DC both?
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: Cable sizing

05/16/2013 3:36 AM

Yep. Anyone can do this. It's all in British Standard 7671.

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Anonymous Poster #1
#2

Re: Cable sizing

05/16/2013 3:38 AM

I never used to have one, but I can find one in the Internet.

Did you loose yours?
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Anonymous Poster #2
#3
In reply to #2

Re: Cable sizing

05/16/2013 3:38 AM

loose lose
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Amitsonpethkar
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Join Date: Oct 2011
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#4
In reply to #3

Re: Cable sizing

05/16/2013 3:42 AM

No , but I have dont.. But I required for design my control panels.

Already I have used manufacturer recommeded size of cable for each amp rating...

But I want to know about actual one..
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PWSlack
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#5
In reply to #4

Re: Cable sizing

05/16/2013 3:45 AM

It's still in British Standard 7671. BSI's on-line retail outlets have so many copies available that they are being sold just to get rid of them.

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jack of all trades
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#9
In reply to #4

Re: Cable sizing

05/16/2013 3:28 PM

Then you should have copies of and be using the latest applicable electrical standards. All the required information is in there regarding cable sizing to meet you local electrical standards and codes relating to your specific application (including application and environment specific cable de-ratings).

Alternatively you can find the information off many of the major cable manufacturer websites.

Obviously there is no single formula that can be offered for cable sizing, that is why the electrical standards are so thick and numerous.

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Anonymous Poster #1
#6
In reply to #3

Re: Cable sizing

05/16/2013 5:16 AM

Lose as in Looser?
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Anonymous Poster #2
#7
In reply to #6

Re: Cable sizing

05/16/2013 5:41 AM

Looser as in not so tight?
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7anoter4
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#8

Re: Cable Sizing

05/16/2013 1:24 PM

According to Wikipedia :

"The latest versions of many European wiring regulations (e.g., BS 7671 in the UK) follow the section structure of IEC 60364 very closely."

So, you may find -for IEC World- many handbook how to choose the cable according to IEC 60364. For instance, "Sizing conductor and selected protection devices" by Legrand[ according to IEC 60364-5-52 ].

http://www.legrand.com/files/fck/File/pdf/Power_guide/EX29008.pdf

However, NEC Art.310 it is recommended for USA installation.

If you intend to calculate the permissible maximum current[ampacity] for a certain cable running in a special [not standard] routing you can follow IEC 60287 way or

The Calculation of the Temperature Rise and Load Capability of Cable Systems, by J. H. Neher and M. H. McGrath.[for USA].Both way require more experience in this field.

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nobodysomebody47
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Join Date: Nov 2011
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#10

Re: Cable Sizing

05/17/2013 9:05 AM

Excel Sheet Calculator for Cable Sizing
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electricalexpert65
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Join Date: Oct 2009
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#11

Re: Cable Sizing

05/20/2013 7:00 AM

It cannot and must not be by thumb rules & charts. A detailed study has to be undertaken considering lot of rating factors.
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Users who posted comments:

7anoter4 (1); Amitsonpethkar (1); Anonymous Poster (4); electricalexpert65 (1); jack of all trades (1); nobodysomebody47 (1); PWSlack (2)

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