[SML] L21-30 power supply

[Dan Sheehan]

Frank, Case under discussion concerns a 5-wire, 3-phase *outlet receptacle*.
I haven't checked the Code, but I strongly suspect that in this situation,
it would be required that if one phase trips, the whole receptacle and
anything plugged into it (like extension cord and nobody-knows-what)
must be depowered.

Note this is different from the case of an independent  120V(in US)
load connected to one leg,
which can be protected by one breaker (I think... again, IANAE).

On Sat, Feb 28, 2015 at 2:22 PM, e-mail frank.wood95 via Stagecraft
<stagecraft at theatrical.net> wrote:
> Richard.
>
> Why do you think this? Dimmer packs are essentially single phase
> devices, the total load being spread across three phases for reasons
> of load balancing. If your breakers work on strict trades union
> principles (One out: all out) tripping one breaker will lose you the
> whole works, and you've lost the whole show. With two phases left, you
> can usuallyy cobble up enough lights to keep going.

-- 
...Dan Sheehan
Fixer of things that break