Goodsounds;322177 Wrote: 
> 
> "having outlets on different phases in the same room is risky"
> 
> This is standard practice in the US for residential wiring, for places
> like kitchens with higher demands. Typically each "box" is on one lead,
> so that the different phases would be completely separate (different
> wiring to different boxes). Among other reasons, this is done for load
> balancing - you want the fridge on a different line than the electric
> range, for example. 
> 

It also saves wire. A single 12/3 cable (2 hots, 1 neutral, and ground)
can carry twice as much power as a 12/2 (1 hot, 1 neutral, and ground).
The netural only needs to carry the difference between the current on
the two hots. In effect, you transmit 100% more power for only 33% more
copper.

Sharing a neutral has a significant safety risk which is that a break
in the neutral wire can cause one leg or the other to get pulled up
towards 240V.


-- 
seanadams
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