Confusing bathroom lights and fan wiring

[Octopus]

I think the op needs some local competent assistance ....

 

[mhar]

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.

Ok, a variation on a theme. In my drawing (dare I call it an artistic masterpiece?)the bathroom light will not be on unless it is switched by the dp switch regardless of whether a switch in the kitchen is operating the fan as well. There is no back feed from the fan because of the use of the double pole switch

 

[Marcus Vaughan]

It isn't that unconventional! It is just a method of wiring using an sfcu to give isolation to all 3 live fan conductors whilst not isolating the bathroom light (so that you can see what you are doing!). Avoids having a triple pole isolator and is a neat way od doing things

But the neutral cannot be isolated?

 

[Toneyz]

But the neutral cannot be isolated?

Isolating what the fan?

 

[Marcus Vaughan]

Isolating what the fan?

Forget that, talking cross purposes, I posted the above by looking at the photo - not the drawing.

 

[Richard Burns]

I would think that if the electrician was having problems that the cables present at the fan may be the ones initially planned and the switching was then adapted to use the previously installed cables.
It sounds like a fairly logical original plan to use a double pole switch in the bathroom and kitchen to allow the fan to be switched on in either location without also operating the light that was not local to the switch.
However the actual wiring plan would need to be assessed with testing and inspection of all switches.
I can use the photographed cables to get a timed fan to work using twin and earth and 3 core but cannot work out how to avoid the timer function. Ah yes use a double pole switch for the fan and wago the permanent line and loop switched line/line in the fan.
A possible layout? obviously subject to verification.

 

[SparkyChick]

@Richard Burns - What software do you use to produce your diagrams? You always seem to be able to knock them up in double quick time and they are usually pretty darn good.

 

[Richard Burns]

@Richard Burns - What software do you use to produce your diagrams? You always seem to be able to knock them up in double quick time and they are usually pretty darn good.

Very kind of you, thank you. I do not usually do diagrams for work (because I am lazy) so I just use powerpoint for the forum diagrams.
I already have various accessories drawn out from previous diagrams and use connectors for the cables. Probably slower than a dedicated program but just one with which I am familiar .

 

[SparkyChick]

Very kind of you, thank you. I do not usually do diagrams for work (because I am lazy) so I just use powerpoint for the forum diagrams.
I already have various accessories drawn out from previous diagrams and use connectors for the cables. Probably slower than a dedicated program but just one with which I am familiar .

Sometimes the dedicated stuff does things that just get in the way and actually make it harder to draw a nice diagram. I used to use SmartDraw alot, then they added all sorts of features that 'made it easier'... yeah right... easier if you want a diagram laid out on this perfect grid.. anything else became a night mare.

I'm going to be cheeky and ask... any thoughts on possibly sharing say a PowerPoint with the common symbols in?

 

[Toneyz]

Richard has interpreted exactly on what I was saying in my post as said without on-site verification cannot be 100%.

 

[Toneyz]

As long as all are on the same circuit and you haven't got the neutrals interconnected between two lighting circuits.

 

[shaun1]

If you get somebody to just swap that double pole switch for a 2 gang switch, putting one pole on each switch, you should end up with a switch for the lights (which can be left on) and a switch for the fan. (This is assuming 1 pole is the lights and the other is the fan, but would be a good place to start)

 

[stringsonfire]

Some more information here.

• This wiring is original. The flat was built by Taylor Wimpy in 2013.
• The fan appears to be a CMEV.4E. Apparently, it's three speed, house-wide extractor designed to be always on, on a near silent low setting, with the medium and high speeds designed to be manually switched. Product information, including wiring diagrams, are here.
• I can't confirm if it is always on - either it's too quiet for me to tell, or it's not. As it only extracts from the bathroom and kitchen, I'm not sure it needs to be.

Kitchen Switch (there's a grey wire not connected to anything tucked in the box:
https://i.Upload the image directly to the thread.com/ay0nUhI.jpg

https://i.Upload the image directly to the thread.com/jw9EG0e.jpg

Isolator:

https://i.Upload the image directly to the thread.com/6W2HTOz.jpg

https://i.Upload the image directly to the thread.com/aiiG61C.jpg

https://i.Upload the image directly to the thread.com/2M1sM83.jpg


Wanted to add this to the first post to keep all the info in one place, but seems I can't edit the post, so sorry it's a bit everywhere now.

So this seems even more complicated than I thought. Am I not better off just removing live cables from the Bathroom Switch until the lights won't turn on, then putting them in a separate switch, and leaving the fan wiring as is?

 

[SparkyChick]

To answer your last question... no. Random removal of conductors is never a good plan.

Can you not isolate it fully, and work out the wiring by appropriate dead testing? Draw a diagram and then work out what needs to change at the bathroom end to achieve the desired result.

 

[Toneyz]

Nice hole at the back of the fast fix box.