Salient discussion at..
www.eng-tips.com/viewthread.cfm?spid=237&sqid=36930
www.eng-tips.com/viewthread.cfm?spid=237&sqid=74797
www.eng-tips.com/viewthread.cfm?spid=237&sqid=83120
Also..
www.squared.com/us/products/nema.ns... e4f84/114f29214c232a6a852568390055a15d/

Be very careful expecting high reliability from 480V pilot circuits, particularly if the control-voltage source is ungrounded; runs are long or any wet conditions occur. Unanticipated/unreliable operation can be especially expensive, particularly with listed motor sizes.




[This message has been edited by Bjarney (edited 07-03-2004).]