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

I don't believe this is true.

When I wired my woodworking shop I installed several 12/3 w/gnd lines from
the service panel to outlet boxes containing  2 GFI's each.

I used separate (not ganged) 20A breakers to drive each phase (one on red
wire, one on black).

In the outlet box the neutral (white) was shared by both GFI's and the RED
and BLACK conductors each drove one GFI.

The electrical inspector specifically said this was a fine way to do it.

Also, the copy of the NEC that I have also contained no prohibition that I
could find against this.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)


> 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
> =========================================
>
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