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Member

Join Date: Jun 2008
Posts: 7

Power cable Selection

06/01/2008 5:52 PM

need Formulars related to Power cable cross sectional area calculation

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Power-User

Join Date: Aug 2007
Location: Bhopal India
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#1

Re: Power cable Selection

06/02/2008 12:25 AM

Hello Ehidek,

Welcome to the forum.

We wish that you will contribute and learn from this forum.

Before we proceed to your question,here are few general tips to get the maximum out of this forum.

a) Please make your question as detailed as possible, more details you give the better answer you will get.

b) Avoid writing in CAPS as that is considered as shouting in this forum.

c) If any suggestion given by the member actually satisfies you, or does not solve your problem, keep that posted.

d) The members of this forum try their best to solve the problems and do have a very good command on the subject.

e) You will be surprised to see the amount of info, archives hold here..so do a search on here or at Mr Google, and in case you don't get anything you are welcome to post your query.

f) Ask one question at a time.

g) Do not use rude remarks and country/religion/ethnic background/poiltical innuendos, in your comments.

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#2
In reply to #1

Re: Power cable Selection

06/02/2008 3:45 AM

i need some one to assist me in getting to know the power cable selection methods through calculation by specifying some known parameters.

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#3
In reply to #2

Re: Power cable Selection

06/02/2008 4:20 AM

The current issue of the "Wiring Regulations", published by the Institution of Electrical Engineers, is a very good place to start.

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Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

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#5
In reply to #1

Re: Power cable Selection

06/02/2008 8:48 AM

Hi chaterpilar,

I endorse your view 100 % and consider it a good answer and I record it also.

Regards

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Guru

Join Date: Jun 2007
Location: chennai,India
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#6
In reply to #1

Re: Power cable Selection

06/02/2008 10:52 PM

Dear Sir

Good job done ! I endorse your views.

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Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

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#4

Re: Power cable Selection

06/02/2008 8:43 AM

Hello ehidek,

The following is an answer I gave for a similar thread in the same forum. If you would have searched you could have read it.Please do a little effort and follow what is advised by other members.

"

Selection of Cable

The selection of suitable cable for any electrical system is the basic job of electrical engineer and a qualifying requirement for carrying out electrical job as per any safety standards. This type of thread is often seen in CR4 and I feel either the people putting up the thread are with out basic technical knowledge or people want a simple answer to attend an interview question. The proper answer to a cable selection or bus bar selection is so elaborate that it needs a minimum of one week's refresher course. Designing any electrical distribution network and electrical switchboard panel is real technical job and not amateur's job as it involves safety of the people operating the system and equipments. Providing a simple formula or calculated figure is improper as the value depend on various parameters. A basic parameters for selection of cable and factors to be considered are listed below .

  1. The cable should be rated for the correct voltage rating and size of conductor.
  2. The selection of normal current rating will depend on temperature rise on normal conditions. This will depend on :-

(i) The ambient temperature of the location where the cable is laid .

(ii) The type of laying of the cable viz. underground, on cable tray, in air ,in duct etc. each condition has its own de rating factors.

(iii) The type of cable XLPE, PVC, PILC, FRLS etc and material of conductor (Copper, Aluminum). Armored, unarmored

(iv) The type of industry and load chemical, engineering, fixed load , varying load,

(v) The length of cable and depth of lying

(vi) System of back up protection and tripping time delay.

3. Short circuit rating of the conductor

The principle involved here is that the cable selected should withstand the short circuit current with out temperature rise or damage till the time the protective device like fuse ,MCB, MCCB , ACB , OCB, VCB etc. operate to disconnect the faulty system from the mains.

In India we follow the recommendation of IS 3691-1967 Part I, III, III, IV, and V Similar standards are followed in all countries which will provide the required data to select the cable."

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chaterpilar (1); ehidek (1); PWSlack (1); ramvinod (1); V.I.Abraham (2)

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