Take power from a light switch

[AndyPRK]

When was cpc sleeving required?

 

[JohnW2]

I don’t know if it’s a regional thing, but it certainly isn’t rare in my area. I’d say that most houses I go to are wired in singles up until maybe the early 90s when it seemed to fall out of favour. The property I was working in on Friday is wired in it.

When you say 'singles', do you mean single-insulated conductors in conduit or insulated+sheathed singles (or sheathed 'single+earth', such as we are discussing)?

Kind Regards,

 

[SUNRAY]

Between 1966 and 1977

1966 is when CPCs were first used on lighting circuits, and 1977 is when the colour for earth changed from green to green and yellow.

Sorry I can't agree with this one, I was using green/yellow at school and I left there in 1972

 

[RF Lighting]

When you say 'singles', do you mean single-insulated conductors in conduit or insulated+sheathed singles (or sheathed 'single+earth', such as we are discussing)?

Kind Regards,

Insulated and sheathed single live or single live and earth.

 

[RF Lighting]

Sorry I can't agree with this one, I was using green/yellow at school and I left there in 1972

Green and yellow was used in harmonised flex from 1970, but stayed green in fixed wiring until ‘77.

 

[SUNRAY]

Green and yellow was used in harmonised flex from 1970, but stayed green in fixed wiring until ‘77.

I added extra stage lighting sockets and I recall the 'odd job man' who also did the electrical bit and pieces asking what the green/yellow wires were for.

 

[JohnW2]

Insulated and sheathed single live or single live and earth.

Interested. Single-sinsulated singles in conduit obviously make sense, but I wonder how the use of insulated+sheathed singles became popular/fashionable, at least in some parts of the country (as I said, it's not something that I have ever seen 'down south'), particularly given that it is presumably appreciably more expensive than twin or T+E?

As I've said/implied, one concern I have about it is that it tempts one to use wiring practices which are far from ideal in terms of electromagnetic radiation.

Kind Regards, John

 

[AndyPRK]

Green sleeve was being used in 1974

Singles are great

 

[333rocky333]

I wonder how the use of insulated+sheathed singles became popular/fashionable, at least in some parts of the country

Historically most rooms had one centre light, maybe when wall lights became more fashionable it was intended as an easy way to add a switchline.
Still to this day people find all sorts including Bell wire chased diagonally down the wall from the centre light

 

[AndyPRK]

The way I’ve seen it used is to take a single from the rose to the first switch.
Then a pair of strappers to the 2nd 2 way switch. Then a single from there back to the rose for SL

 

[RF Lighting]

Interested. Single-sinsulated singles in conduit obviously make sense, but I wonder how the use of insulated+sheathed singles became popular/fashionable, at least in some parts of the country (as I said, it's not something that I have ever seen 'down south'), particularly given that it is presumably appreciably more expensive than twin or T+E?

As I've said/implied, one concern I have about it is that it tempts one to use wiring practices which are far from ideal in terms of electromagnetic radiation.

Kind Regards, John

Generally wiring in singles will use less copper as you aren’t running an unnecessary permanent live to every pendant, or a neutral to every switch as you would with twin cabling.

I remember starting to use three core and earth as a new thing to try and reduce EMI.

 

[333rocky333]

When was cpc sleeving required?

I would quess the 15th when Table 51A was introduced , which states identification for bare conductors for fixed wiring as G/Y.
Not got 14th to hand but although that mentioned the cut off time for Plain Green for earth. not sure it said it was compulsory to use it

 

[JohnW2]

Generally wiring in singles will use less copper as you aren’t running an unnecessary permanent live to every pendant, or a neutral to every switch as you would with twin cabling.

I'd have to think about that since my first reaction is to feel that there's not much copper to be saved in that way In any event, once CPCs came along, any such advantage would surely be largely (if not totally) cancelled by unnecessarily running at least two CPCs to every point in the circuit, wouldn't it?

I remember starting to use three core and earth as a new thing to try and reduce EMI.

Indeed, the 'old-fashioned' way of doing two-way light switching was another good way of generating EMI !

Kind Regards, John

 

[JohnW2]

The way I’ve seen it used is to take a single from the rose to the first switch. ... Then a pair of strappers to the 2nd 2 way switch. Then a single from there back to the rose for SL

As I've just written to RF, a good way of generating EMI

Kind Regards, John

 

[Lol999]

Okay, first of all thanks to everyone who has commented and offered suggestions, much appreciated.
Now, for clarity, the light I am speaking of is in what was a downstairs toilet in a ex - council house that has been converted to a laundry area.
The other light, the Moses era one, is in a 'outhouse' which is attached to the toilet, at one time would have been separate but has had the dividing wall knocked through.

If the lights are in any way connected then it is buried, everything about this place is 'bodged', and having lived in council house of 1950's vintage believe me they can be fairly awful.

At the toilet light fitting there is just one each of earth, live and neutral.

My question is: if I were to take a feed off the three terminals in the existing light fitting would it 'power' another light fitting being controlled by a single switch?