Loop in loop out

[cardiy]

I have been reading that the old way of loop in out of roses is no longer used for new installs ,loop in and out at switch is now used for new installs.Why is this surely it is more of a pain and not much room for cables behind switches.

 

[Monkeh]

It's much easier to access, makes light fittings easier to work on, eliminates capacitive coupling.. I'm sure others can list further reasons.

Space isn't really an issue. You don't have to use 16mm boxes. Very few walls lack the space for at least a 25mm box.

 

[holmslaw]

..

 

[oharaf]

I still prefer the oppportunity to fall off the ladders

 

[Chri5]

It also make the installation of any lamp fitting much easier for "Mr Average DIY" since there's only 1 x 2 core and earth at the fitting for L and S.L

How many queries a year do we get regarding loop in / out and switch cabling at the rose due to lost over sleeve or absence of one from the original installation ?

 

[TicklyT]

Loop at rose was devised when virtually every light fitting had a ceiling rose, and the old round surface mounted tumbler switches with no space for extra connections were common.

You can make as much space behind modern flush mounted switches as you need, and ceiling roses are now much rarer, so.....

There's probably little difference in the amount of cable used. Sometimes it may even be less.

.......there's only 1 x 2 core and earth at the fitting for L and S.L.......

If you like, but you might find Switched live and Neutral works better....

 

[flameport]

You don't have to use 16mm boxes.

Does anyone use 16mm boxes now?
Pretty much useless, as no room for extra connections, flat plate switches won't fit, and neither will dimmers.

 

[Chri5]

My bad

 

[bongos]

Does anyone use 16mm boxes now?
Pretty much useless, as no room for extra connections, flat plate switches won't fit, and neither will dimmers.

I did use some 16mm backboxes last year before I knew better! Won't be making the same mistake again though. 25mm all the way.

 

[electronicsuk]

Does anyone use 16mm boxes now?
Pretty much useless, as no room for extra connections, flat plate switches won't fit, and neither will dimmers.

I did use some 16mm backboxes last year before I knew better! Won't be making the same mistake again though. 25mm all the way.

I always fit 35mm, but then again, I'm not a domestic spark and so don't have to chisel out walls for deep backboxes day-in day-out.

 

[bongos]

I always fit 35mm, but then again, I'm not a domestic spark and so don't have to chisel out walls for deep backboxes day-in day-out.

D'oh. I meant 35mm not 25mm.

 

[cardiy]

So what would the wiring set up be at the switch thanks.

 

[ColJack]

if you have to do it day in and day out, you invest in something to do it for you...
either a sds drill with a chisel, or an EBS ( Electrical Box Sinker ).... or an apprentice..

 

[cardiy]

So what would the wiring set up be at the switch thanks.

?

 

[flameport]

So what would the wiring set up be at the switch thanks.

The equivalent of what would be at the rose, so if using twin and earth, there would be 3 cables, each containing L/N/E:

1x supply in
1x supply out
1x cable to the light

In the switch box, the three neutrals connect together in a terminal block
The three earths connect together in another terminal (typically the one fixed to the box itself)
The two lines (in/out) go to C on the switch.
The remaining line (light) goes to L1 on the switch.

At the last switch on the circuit, there are only 2 cables, as there is no supply out.