failed spur wont isolate , but looks dead

why you should always check your isolation
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[@zaxmaxlax]

Probably swapped L and N.

[@MADSPARKS31]

Hate them key switches, not fit for purpose

[@anthonybragg]

Hate that those spur/isolators are poor to wire and the terminals feel as if they are going to break off (If we get supplied to fit) . Prefer to us a 2g MK grid arrangement 20A key switch and fuse unit with the plate being engraved or MK/Contactum key switched m/clad spur.