On Sat, 12 Jun 2004 00:02:22 GMT, "Alan Black" wrote:
Sorry, I did think that he meant single phase. If 4 wire two phase is two
hots 90 degrees apart and two companion neutrals , I'm not sure if you need
to switch the neutrals too. Of course with three phase you must switch all
three.

There aren't any neutrals in a 4 wire 2 phase system. All 4 wires are hot.

Gary