On Nov 12, 9:40*pm, "Doctor Drivel" wrote:
Some device that isolates the L & N when it activates must offer a higher
level of safety.- Hide quoted text -

For TT - yes.

For TN-C-S - no, not at all.
With PME both N&E are joined at the cutout, so you just disconnect N
yet E is still connected - so no logic there. You must not isolate E
under BS7671 reg blah-blah-blah (can't recall the damn number). Three
pole isolators are for L1 L2 N not LNE (contrary to some numpties I've
met).