Who will live there after you leave?

"DJ" wrote in message
oups.com...
On May 7, 7:05 pm, Ignoramus23720 ignoramus23...@NOSPAM.
That kind of stuff, the safety is in physical impossibility of
linking
sources, not the reliance on a meat puppet to do the right thing and
not throw both switches at once.

In a restricted industrial setting, there can be different rules.
Residential is another matter...

DJ