110v stickers

Not in general, in my view.

Stickers MIGHT be required to avoid confusion with other voltages, but I am not aware of any general requirement.

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.


   - Andy.

And even if U0 > 230V, a warning sign is only needed where "such a voltage would not normally be expected". [514.10]

Thanks guys when would a case be that it would be an unexpected voltage?

An example of 'unexpected may be if the same style of switch board or link box was used for two wildly dissimilar voltages where different safety regimes may operate - say identical boxes but one at 690V 3 phase (not to be left open with the power on) the other with telcoms or alarm wiring at 48 or 24VDC (where maybe you would be more or less worried about access! ).


On well managed estates the house style tends to trump the minimum requirement, and all boards of a certain type carry some sort of label, if there is scope for confusion or not.

(" 3 phase panel no 6, warehouse lighting" that sort of thing, or a cryptic code that tells those in the know where to isolate it. )