I've been asked to add a USB charging port into a bedroom with a bath in it.
My understanding of BS7671 is that a room with a bath is a bathroom. As such the outlet would be in zone 2 of the bath.
Would I need to power the charger via a safety transformer and could this be built into a +IP4 enclosure similar to a shaver outlet
Thanks for your assistance
I've been asked to add a USB charging port into a bedroom with a bath in it.
It must be said, very few modern bathrooms have that much free space
electrocution in the bath
I suppose that in the days before fixed plumbing, one might have taken a bath in a bedroom, but my mind boggles nowadays. Who is going to spend so long in a bath that the 'phone's battery will run out? 
Presumably, there would already be sockets in the bedroom.
I am bound to wonder what completed the circuit in Graham's link. Could it be that supplementary bonding contributed?
Skin resistance when substantially immersed is unknown ... and may drop to very low (nearly zero) values. This factor means that very low voltages, perhaps into single figures, might actually be very bad to someone who is substantially immersed in a bath.
I assume that most of us have licked a PP3 battery 
so it cannot just be voltage.
If 30 mA is the safe limit, 9 V across 300 Ω could be risky.
In the 'good contact', wet body case, the sort of [low] limits used in agricultural areas may be more relevant (think of licking the brass / steel nails in a lemon test..).
Quite a different consideration compared to the dehumidifier in the laundry-bathroom scenario 
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my cardiologist doesnt recommend this as teeth have a nerve pathway to the heart and pp3 have cause arrhythmia
oof; A reference would be useful, if available, for my/folk's files.
The PP3 does have its return path close to the source connection. Looping the contact between tongue and [wet] toe may be too exciting
