determination of electrical wiring and cable size.

Google 'Amp Capacity of Conductors'

If you are not familiar with NEC, you really need an electrician to wire your motors.

There is a circumstance that calls upon the services of a layman when the specialist of that particular job is nonavailable. This situation must be prepared beforehand. Thank you anyway TVP45. Every one is entitled to learn as far as I know and also entitled to share what he has learned.

edbesas,

I certainly agree with you that everyone is entitled to learn. To that end, I suggest you look on ABE for a used copy of the NEC Handbook. It should run about $30 (US) and will have about 1000 pages. By the time you finish that, you should have some idea of what you need to know.

Thank you sir for your generosity. I know that you will be blessed of having more knowledge because of your power of giving.

Sizing of motor feeder is not same as other feeder. Not only you have to check VD of running condition but also at starting condition. when calculating VD, dont forget that PF is different for start and run condition, so use approprite formula for VD calculation.

A public Library usually has code books or short abbridged versions of tables.

First thing as was stated in other threads, length of cable ,motor fla (current draw), applied voltage aluminum or copper or other conductor tpe ,enclosed or free air calculations. Motor capacity single phase Volts applied X FLA, 3 phase 1.732X(FLA.X VOLTS ) approxiamately

Hi edbesas

See my reply here: http://cr4.globalspec.com/comment/112262

The Gencalc programme referred to is free to download and use and contains a basic motor current calculator for NZ conditions. You don't state your area so I don't know the voltage you operate in.

Consult your local wiring regulations to find the specific rules in your locality. Remember that currents will vary with voltage and frequency. Currents generate heat and heat is what burns buildings down.

As you say there is no harm in learning but you must also learn when you should invest in the help of a professional.

On the basis of the nature of the wording in this post:

• For domestic installations and alterations, a consulting a qualified Electrician would be the first step.
• For industrial installations, consider consulting a qualified Electrical Engineer.

The "Wiring Regulations", current edition, is applicable. The Institution of Electrical Engineers maintains and publishes this code. Protocols for conductor sizing may be found within its pages.