extractor fans

[Octopus]

I thought under Part P a bathroom extractor fan installed in a bathroom without windows must have a triple pole isolator to isolate for maintenance without turning the light off?


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Which is fine aslong as you want to "maintain" the fan during daylight hours.

IMHO as a fixed piece of equipment, fans should always have isolators, and that's exactly how I always fit them.

 

[Richard Burns]

Where you have two independently fused supplies to one piece of equipment and then need to label the supply to indicate there is more than one means of isolation and a customer will find the fan has stopped and ignore the label and get a shock.

is'nt that what the triple pole isolator do's Mr Burns (one means of isolation)?
and should the fan not be extra low voltage,

The problem here is that if the fan stops working the consumer assumes it is off and may start work on it not realising that there is still power to the fan. The regulations state that one of two line conductors may be disconnected if it does not give rise to danger, which it may do in this case.
If there are dual supplies to a piece of equipment there should be a label indicating this, however the triple pole isolator does remove this need but, I feel, it should be indicated at the fan that this isolator must be used if you are double fusing.
The fan does not need to be ELV.