ECM Buyers' Guide

electrical basics

The basics of 400-Hz power systems. 

Mar 1, 1995, Dedad, John A.

Although the use of 400-Hz power is certainly declining, especially in mainframe computer power systems, some existing systems may need upgrading because...

Understanding variable speed drives. (part 2) 

Mar 1, 1995, Turkel, Solomon S.

Three basic types of variable frequency drives offer certain advantages as well as disadvantages depending on your motor application. The new flux vector...

Sizing manholes. 

Feb 1, 1995, 

We were asked to comment on an installation similar to the one pictured in the drawing. Half of the conductors coming in from the 24-duct bank turn out...

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