Extractor Fans In Shower Rooms, Isolators

[sjwkmje]

Hi All,

Before we start I know about part p, I am working with a part p registered electrician just after some advice. I have also read the 7671 requirements for isolation. Just like to point that out before I start!

Asked to fit two extractor fans in two shower rooms. So the entire room is as such a wet room. Opted to use IPX4 rated fans, SELV. The ones we will use have integral humidstats so need no switched live.

So plan to wire these with 1mm t+2 to a spur to give double pole isoaltion and fused down to 3amp from the 10amp lighting radial, to a transformer to the fan.

Problem is location of the isolators, a window bus frosted glass so no real natrual light so isolators are needed but as its a wet room I don't want to fit the spurs inside the wet room. Requirements for isolation say outside the zone but this would be outside the room or can I put the spurs next to the transformers in the loft?

Usally I would fit a 3 pole isolator outside the zone usally above the door to the room.

In this case the customers don't really want a spur on show as such, as one is a hall way and one is a bedroom.

Any ideas,

Thanks,

Adam

 

[hairyben]

I'd say the loft is fine, so long as it's accessible, given it'll be next to what it's isolating (the transformer) it's ideal. The isolator is a service switch, not a functional switch.

 

[sjwkmje]

I'd say the loft is fine, so long as it's accessible, given it'll be next to what it's isolating (the transformer) it's ideal. The isolator is a service switch, not a functional switch.

Yup next to the transformer labeled would show what it is for. Its not functional and is there just for a method of isolation. I will locate it in the loft secured to the end wall next to the transformer and use yt2 to run the cables down the wall.

 

[JohnD]

IMO a very good place for a bathroom isolator (or FCU) is above the bathroom door, in the corridor.

It is high enough to be unobtrusive and not offend the eye, but it is visible and accessible when it is needed. Its purpose is obvious (to me at least) but you can always put a neat label on it.

Better there than in the loft as visible and accessible (not everyone would think of searching the loft)

 

[GaryMo]

IMO a very good place for a bathroom isolator (or FCU) is above the bathroom door, in the corridor.

Or here? It's local

 

[sjwkmje]

IMO a very good place for a bathroom isolator (or FCU) is above the bathroom door, in the corridor.

It is high enough to be unobtrusive and not offend the eye, but it is visible and accessible when it is needed. Its purpose is obvious (to me at least) but you can always put a neat label on it.

Better there than in the loft as visible and accessible (not everyone would think of searching the loft)

Sorry forgot about this thread! I have just finished the job, I have put a label inside the fan explaining where the isolation is. I have also labeled the spur inside the loft. Its really self explainatory as the transformer is screwed to the back wall with the spur next to it all done with YT2 to make it neat. I will try and get a photo at some point.

IMO a very good place for a bathroom isolator (or FCU) is above the bathroom door, in the corridor.

Or here? It's local

Gary that is Local! Is that a SELV fan or not? If its not it should not be in that zone at all. How did you fix that?

Adam

 

[GaryMo]

It's a 230v fan and is perfectly fine for the location (Zone 1) having a minimum IP rating of IPX4.

It's something I noticed whilst working there. The owner wasn't available to speak to at the time though I've since spoken to him about moving the isolation switch to the reverse of the wall (not happened yet though).
It's an easy job as the wall is plasterboard with a bedroom on the other side. I would probably leave the single drylining box in place and fit a single blank plate over it and silicone around the edge.