Cable Size

I agree with Jack. This is a simple problem for those in the electrical business.

Put some numbers up and make an effort to do it yourself. I will be glad to assist but I won't do it for you.

Dear Arif

Please mention the ambient temprature, load behaviour, either there are torque lods or smooth loads, the cable burried directly under groud or hanging on walls or through steel conuit system then it will be very easy to calculate the cable size, one thing is very necessary, that is the length of the cable.

Your all local cable manufacturers provide the cable sizes tales and other factors calculation you also can get their ''cable and table'' book from them.

Please submitt the requred data I will provide you the exact cable size according to IEEE.

Will you be available as a defendant in a lawsuit if several people die because he left out a decimal point? He is not hooking up a clothes dryer here. If he wants to do it himself then the information is readily available on the internet. If he can't decipher the information, then he shouldn't be messing with this project without an on-site professional anyway.

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.

open link :

http://www.electriciancalculators.com/

may be helpfull but requires knowledge to even understand the contants,but one needs experiance and knowledge to size cables properly,engineering is no nonsense business and mistakes can lead to disastures.

seriously consider hiring a local consultant.

regards,