Odd wiring.

  • Thread starter The Medway Handyman
  • Start date

T

The Medway Handyman

No, you put the supply in the Supply side and the load in the Load
side :)


RED ---------|--SUPPLY 1 LOAD---YLW1
|
RED ---------|--SUPPLY 2 LOAD---YLW2


BLUE --------|
|
BLEU --------|


Owain
No Link?

YLW1?

YLW2?
 
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Hi,
Its all very simple really,

There is one fan venting 2 rooms so if you used a normal single pole on / off switch when you went in one room and switched on the light and fan, then the light in the other room would also come on,

To avoid this happening double pole switches are used, but because they are normally used to isolate the live and netural they are marked "L in" "L out or load" "N in N out or load".

in effect you have 2 switches in one unit both working together with the pull cord..

so it is wired 2 red into Lin yellow from one cable to L out.

link between L in & N in and the other yellow is connected to N out.

So the L in / L out switches the light

and the N in / N out switches the fan. (or the other way round)

This stops the light comming on in the room not being used.

Some double pole switches are marked "in 1" "out 1" and "in 2" "out 2" which advoids the confussion as in this case you are not switching the neturals, they are joined in the choccy block

Hope this clears up the confusion.

Dav1d
 
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T

The Medway Handyman

Doing various jobs at a lady's house, one of which was to replace the
pull cord switch in her en suite. Like for like, should have been simple.

Three story town house, en suite and common bathroom on the same floor.

One extractor fan vents both bathrooms via trunking.

The switch had failed mechanically as pull cords often do, but this one
was a weirdo.

Two cables coming in, both three core & earth, so red, yellow, blue.

The switch (Tenby MG888) had 4 terminals + earth.

Top left = COM, top right = N, bottom left = 1 WAY, bottom right = 2 WAY.

Never seen one of these before.

Cable 1 wired yellow to COM, red to 1 WAY, blue joined to blue in Cable 2.

Cable 2 wired yellow to COM, red to 1 WAY, blue joined to blue from
Cable 1.

Terminals 1 WAY and 2 WAY are linked by a red cable.

I assume it's wired so that the switch in either bathroom triggers the
fan (which is on a timer).

Three visits to electrical wholesalers & a web search doesn't find a
Tenby MG 888 switch, so I've e mailed the manufacturers.

Not knowing how the switch 'switches' I can't figure out how it would
work or what alternative I can use if I can't locate a replacement switch.

This has even caused the knowledgeable & helpful Mr Wadsworth to scratch
his head!

Any thoughts?
Went back today with a double pole switch, wired it in as advised -
worked a treat - everything working as it should do.

Many thanks everyone, especially Adam & Owain.
 
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O

Owain

Went back today with a double pole switch, wired it in as advised -
worked a treat - everything working as it should do.
Has that poor woman been without a light / fan in her bog since 15
July???
Many thanks everyone, especially Adam & Owain.
Glad we got there in the end.

Owain
 

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