On 21/01/2017 10:50, Caecilius wrote:
On Sat, 21 Jan 2017 09:56:35 +0000, Nightjar
wrote:

On 20-Jan-17 6:33 PM, Caecilius wrote:

How about three double throw contactors, each powered by one phase and
wired so that it passes that phase through to its associated CU when
powered, but switches to another phase when the power fails? It should
work completely automatically, with minimum down time, and they
shouldn't draw enough power to cause you heat gain problems.

If you want to allow for the possibility of two out of three phases
failing, a second contactor in series after the first and powered by the
output from the first would allow you to switch in the phase that isn't
connected to either pole of the first if both of those fail.

Thanks. That sounds like it might work. I'll sketch it out and see if
it's workable.

Do short power outages cause trouble for your PCs etc or are you using UPS?



--
Adam