Joseph Gwinn wrote:


At that voltage level, you are not allowed to use directly activated
switches, and must instead use contactors in grounded metal boxes, and
so on. I'm sure we will hear from the electricians on the group about
that.

Completely not the case.

You can use switches up to any level, yes,direct manually actuated
ones.

They do get BIG as the voltage gets higher, Size of a hallway closet
in the case of 12 and 21 KV.
jk