Ah, sorry - I was complaining about the lack of a capital V, not the
400/415 thing. Ignore me I'm being pedantic.Just to clarify, I was referring to 415V warning stickers on "grid switches" (and in particular in office areas), not on switchgear/appliances on the shop floor, where one would certainly expect to see appropriate labelling.
Andy Wade has kindly cited the relevant regulation (541-10-01) in another message.
Cheers,
Rumble