As far as I recall BS 7671 only requires voltage warning labels when the nominal voltage above earth exceeds 230V (so not even needed for 230/400V 3-phase systems these days).
There may be site or customer requirements for extra labels though - probably no bad thing if there are multiple systems in the same vicinity.
As far as I recall BS 7671 only requires voltage warning labels when the nominal voltage above earth exceeds 230V (so not even needed for 230/400V 3-phase systems these days).
There may be site or customer requirements for extra labels though - probably no bad thing if there are multiple systems in the same vicinity.