IIRC, The National Electric Code specifically prohibits using a common
neutral between the two phases.

With the neutral's only tied together at the service panel you avoid a very
dangerous situation when a neutral goes open outside the service panel.

 ___   120VAC
|   |-----------x    <----------x
| S |           |               |
| V |      [100W bulb]          |
| C |   N       |               |
| E |-----------x              240VAC
|   |                           |
| P |-----------x               |
| A |   N       |               |
| N |       [500W load]         |
| E |           |               |
| L |-----------x    <----------x
 --- 120VAC


Paul

=========================================
Paul Hutchinson
Chief Engineer
Maximum Inc., 30 Samuel Barnet Blvd.
New Bedford, MA 02745
phutchinson@imtra.com
http://www.maximum-inc.com
=========================================

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads