On 13/04/2011 20:54, ARWadsworth wrote:

I was having a brain dead moment. My apologies...

I was waiting for the penny to drop. . .

What you do have to watch though is non-linear loads (old iron-cored
fluorescent ballasts, for example) where the 3rd and 9th, etc. harmonics
add in in the neutral, even when the load is perfectly balanced. The
17th ed. requires double-size neutrals in some circumstances. Checking
neutral current with a clamp meter (preferably true-RMS reading) is
always a wise precaution on 3-ph work.

--
Andy