Three phase and IBM

[Eric Smith]

Brian Knittel wrote:
 > I need to know how to determine if the setup needs to be wye or delta.

Check the power plug or cable.  If the equipment has a neutral (not 
ground!) lead, it needs wye.  Otherwise it needs delta.

That usually means that a four-lead power cable (three phases and 
ground) for delta, and five-lead (three phases, neutral, and ground) for 
wye.  However, some old equipment doesn't have a ground lead, in which 
case it is three for delta, four for wye.

If the equipment contains any three-phase synchronous motors, you have 
to get the phases in the right sequence; if they are reversed, the 
motors run backwards.  That can affect blowers, and the spindle motors 
of disk drives.