Book on 3 phase wiring?

I'm looking for a book that describes how to wire 208Y and 240 delta circuits, particularly what the different panels look like, the different types of breakers (eg. push in, bolt on, etc.), recommended wire gauge based on current and distance, etc ...

Panels are either one-pole, two-pole, or three-pole.

Whether you wire a three-pole panel for Delta or Wye doesn't matter.

The only exception I can think of is for the old 240 grounded Delta, which used a two-pole panel and special "Delta Breakers" (no longer available from most vendors, but still available from Square D). Grounded Delta is still found in some jurisdictions, but it is not allowed under the latest codes.

Convention and code says that phases are A, B and C, left to right or top to bottom, with B being in the middle.

B is also the "manufactured" phase in a such a system. Also the "red"/"high" leg in that system.

The phase, if any, which is at another potential to ground than the other two is by convention and code required to be identified by orange insulation or tape.

Look for a copy of the "National Electrical Code Handbook". I can't lay my hands on my copy at this moment or I could give you the ISBN number also. It describes the wiring of residential, farm and industrial applications in single and 3 phase power.

Jim Vrzal

AL wrote:

there is a group alt.engineering.electrical - looks like lots of good info available

Dale

Sort of. I have a 1000 page book at work, don't remember the exact title. I don't think it would help you that much. There are some good online tutorials covering three phase basics, I think you could find them by googling this group and checking out one of the phase argument threads. I think Eaton has some good basic stuff online. If you really want to learn how to work on three phase equipment, some vocational training and an apprenticeship of some sort wouldn't hurt.