Confusing bathroom lights and fan wiring

[westward10]

Is it just me but from that switch I cannot work out how the fan works. Due to the amount of neutrals that is not end of line and the neutral terminal with three browns, it looks like two but is three is the loop terminal so I suspect there is a shaver socket. The other brown on its own goes to the lights, the triple core conductors assuming that is the fan are isolated at the switch from the loop in lines?

 

[stringsonfire]

Is it just me but from that switch I cannot work out how the fan works. Due to the amount of neutrals that is not end of line and the neutral with three browns, it looks like two but is three is the loop terminal so I suspect there is a shaver socket. The other brown on its own goes to the lights, the triple core conductors assuming that is the fan are isolated at the switch from the loop in lines?

Just checked, the shaver socket power disappears when I turn off the light circuit breakers

 

[westward10]

Yeah I am singing out load here because the more I look at it the more it intrigues me. If those connections are original and your electrician hasn't changed them and this won't help you but may be of interest to another electrician you need to employ. Those two wires to the left which are part of the three core cable do nothing and the fan is connected direct from the lights or, there is a secondary live to the switch which does use those two wires to switch the fan. My conclusion is someone has incorrectly connected the fan.

 

[littlespark]

What have you got there? 4 twin&earths and a 3core and earth?
Instinct says the 3 core should got to the fan isolator, then onto the fan.... but where they are connected in the switch suggests otherwise.

There are too many cables there for anyone to give an educated guess without knowing what cables are at the kitchen switch or the isolator.

 

[westward10]

I believe you have live in, live out, output to the lights and a shaver socket output. The triple-core is totally confusing by the manner in which it is connected.

 

[Baddegg]

I think I would shed a real tear if I opened that up.......

 

[SparkyChick]

I think the key is the fact there (unless I've misinterpreted the OP) is one fan (ducted to process the kitchen and bathroom) and it's switched instantly from both locations.

But regardless, it looks like a right bodge.

 

[Toneyz]

This is what I think (and I apologise if it is repeating what Westward and SparkyChick have posted as I think they are thinking the same)
There is a lighting circuit feeding in and out of the switch.
One of the cables is for the shaver socket
The other twin&E to the bathroom lights this switches through N pole
FAN
There is an AHU, fan unit etc as described a 3 core and earth would of been taken to the bathroom and kitchen and is being used as a linked switch in both locations
A suggestion would be a 2g grid switch with one switch for the light and an engraved fan switch.
I don't think that the neutral should be in with the lighting neutrals.
If the OP does not want a switch for the bathroom it would be a case of the bathroom switch wire being put with the lighting circuit permanent live.
This is only a guess from posts and advise an electrician be sought to test and confirm.

 

[robd]

Just needs someone decent to look at it and suss it out doesn't look that drastic

 

[stringsonfire]

Thinking about it, the ideal way to have this would be a separate bathroom fan switch that works like a local isolator (be it in a separate box or grid switch) so that:

https://i.Upload the image directly to the thread.com/rBYIbaC.png

That way, I can use the Fan switch to turn the fan on and off, keeping my Hue lights always on, and when I eventually move out, the next people can leave the fan switch always on, and just control it with the light switch like they'd expect.

So anyone here in Hertfordshire?

 

[mhar]

but when did OP mention a SFCU?

Isn't that exactly the point of the question?
The op and his electrician have not recognised the wiring method, they have looked at a double pole switch and been baffled by it. This is a method that I first came across 10 years or so ago and was equally baffled but is a method I still occasionally use (admittedly usually with a dp mk logic ceiling pull switch). If I removed a switchplate and saw the wiring as per the photo my first thoughts wouldn't be wtf but I would be thinking the installer has cleverly seperated the fusing of both the fan's line conductors from the light switch and provided isolation of all live conductors to the fan (without affecting the bathroom light) for the cost of a couple of metres of 1mm t & e and a wago plus having avoided one of those beautiful fan isolator switches

 

[mhar]

 

[mhar]

The picture in the op is exactly the same as in my diagram above, hence my reply

 

[westward10]

The picture in the op is exactly the same as in my diagram above, hence my reply

I see what you are getting at now.

 

[SparkyChick]

Except that's not how it's wired.

From the OP, there are two switches that control the fan as the fan serves both the kitchen and the bathroom. The DP switch is there to separate the bathroom light switching from the fan switching so the bathroom light doesn't come on when the fan is turned on from the kitchen.