Dear Sir,
Greetings!
May I kindly ask if anyone can provide me a book or technical chart on what Primary Resistor must I used for every Wye-Delta Starting Magnetic Starter? based on 220 volts & 440 volts.
Also what is the advantage & disadvatange of using a Primary resistor & a 3 contactor type Wye -Delta Connected Magnetic Contactor?
Please furnish me all the details. Thank you very much!

Here's a good link to some reduced voltage starter information from Square D. http://www.squared.com/us/products/softstar.nsf/07a0210021262d45862564b5006e4f84/8ffc301f8779a3fe85256634004c3640/$FILE/1541.pdf