ss wrote:

I just know I need to use a 3.pole switch and wondered if regs dictate
what type in a bathroom.

The Regs do not ask for a 3 pole isolator, they ask for an isolator that
isolates any Line conductors (and neutral on TT systems).
It is manufacturers instructions which ask for a 3 pole isolator, and
that can even be ignored now the 3rd Amendment is here, if you can
justify not having it.
Greenbrook fans do not ask for a 3 pole isolator.
--
Alan
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