Electrics for a bathroom extractor fan

[wibbit]

Good day all

I am looking to install an extractor fan in to our bathroom, from looking around the web, I think I'll be going with a Humidistat based fan, as I think from a wiring perspective it is simpler, and during the summer, we do not always use the lights.

My main question is regarding the electrics, and what is required as far as switches are concerned.

I'm in a council flat, with concrete floor and ceiling, and usual walls, brick and/or the greyish blocks (loads of dust when drilling through them, fairly soft).

The bathroom is situated along side the kitchen, and the boiler is situated in a "stock room" that is also along side the kitchen/end of the bathroom.

Currently their is an electric cable coming from the kitchen, through the bathroom and in to the stock room to power the boiler, it is fused in the kitchen.

The spur carries (I believe) one double set of sockets in the kitchen, and the boiler nothing else.

My intention was to use a junction box (http://www.screwfix.com/prods/18802/Electrical/Cable-Accessories/Junction-Boxes/Standard-Junction-Box-5A-4-Terminal) to split of the cable going to the boiler, and have it also drive this fan (http://www.screwfix.com/prods/15722/Heating-Cooling/Extractor-Fans/Manrose-Humidistat-Bathroom-Extractor-Fan-4).

The junction box would be in the kitchen, and not the bathroom.

Additionally, I wanted to install a shaving socket similar to this http://www.screwfix.com/prods/55378...te-Moulded/MK-Range/MK-Shaver-Socket-115-230V and have that fed from the same cable that is feeding the extractor fan (have the cables joined in the metal ko box.

Does this sound feasible, and in accordance with regulations? Am I missing some thing?

Any comments/tips would be welcome


Oh, and one last thing, the "shaver socket" those would charge an electric toothbrush, that comes with a two pin plug (looks pretty much identical to the shaver plug).

 

[aberdeenpaul]

the boiler should be on its on circuit due to the load
you would be better trying to feed from the lighting circuit in the bathroom

 

[wibbit]

the boiler should be on its on circuit due to the load

I wouldn't have thought the boiler would have a high load? Does the motor to drive the water around the central heating system really that high?

you would be better trying to feed from the lighting circuit in the bathroom

If it can be driven off the lighting circuit, I'd have thought it would have been light enough not to add too much load to the central heating circuit.

However, my main issue with driving off of the lighting circuit, is due to the solid brick floor/ceilings, which makes it incredibly hard to cut in to, to lay the cables cleanly.
I didn't think it was safe to chisel around the wall horizontally accross the entire room (which would be required) to get the electrics from the light switch.

 

[Steve]

the boiler should be on its on circuit due to the load

Nonsense. 150 watts? Hardly a particle accellerator is it?

 

[wibbit]

Okay, I think I'm right in saying that it will not be a problem having the fan/shaving socket on the same fused circuit as the boiler.

My last question is regarding the ducting, I assume that I'll need to pick up a small amount of 100mm ducting to take the air from the bathroom to the outside world (it's an external wall)
http://www.screwfix.com/prods/15722...s/Manrose-Humidistat-Bathroom-Extractor-Fan-4

Would I pick up some thing like this
http://www.screwfix.com/search.do;j...FFI?_dyncharset=UTF-8&fh_search=100mm+ducting

or
http://www.screwfix.com/prods/13161/Heating-Cooling/Ducting/Ducting-Outlet-Flaps-Brown
and
http://www.screwfix.com/prods/17297/Heating-Cooling/Ducting/PVC-Hose-White-1m-x-100mm

I assume that some of the efficiency of the fan would be lost "opening up the vent", however it would reduce the likely hood of noise/wind blow back etc.

Do I look as if I'm on the right track?

 

[aberdeenpaul]

y

 

[Steve]

y

y what?

A boiler only requires electricity to ignite the gas (<1 watt), the controls (<20 watts) and the pump (<100 watts) and maybe a flue fan (a few watts)

 

[Michael Beaumont]

I had a company have a look to fit an extractor in the bathroom. They said their electrician would clamp onto the 5 amp bathroom light supply.

 

[winston1]

I'm in a council flat, with concrete floor and ceiling, and usual walls, brick and/or the greyish blocks (loads of dust when drilling through them, fairly soft).

The first question is: has the council given you their blessing to you to knock in the walls of their property to fit a fan and flue?

 

[denso13]

The first question is: has the council given you their blessing to you to knock in the walls of their property to fit a fan and flue?

Not sure it matters now, it was nearly 15 years ago.

 

[markyd1]

Rcd protection?.. testing? certification?