Ok. But then it's a serious amount of extra cable - and work - in the average house with suspended floors. Because you'd be into three lots of TW&E to most switches on a radial circuit. And then deep boxes to give room for the connections.
Well, yes.
Properly made off connections don't need maintenance. :-)
So you're now into 4 lots of TW&E? I hope you've installed a *big* box.
There's always one drop per switch - unless I'm missing your drift. And I'm not sure what you mean about the next part.
Like I said, installing the switch drop in triple and earth - so you have a neutral if you wish to add table lamps, etc, where the circuit is now on a different floor - is a good idea.
3 lots of cable into all boxes, yes, but only 1 into c. rose, net effect is no extra cables they are just going to different places. Using rose style you just have the 3 cables at the rose (assuming I am understanding things here).
Still not sure why this is a lot of extra work?
Box depth, granted, is IMO a minor issue, but in practice I had no problems with 25mm and 35mm boxes even with 2 way switching. My kitchen cct has double gang 2 way switches, for two sets of lights, the switches are in 35mm back boxes IIRC (I did not buy anything deeper). Its a bit cosy on the feed in/out switch, but thats all. Also, In simplest, unextended form you only require a single extra connection above whats on the switch and back box (for earth).
Sorry ... last post should have said 2 drops extra per switch (1 out to rose - same, 1 feed in - extra, 1 feed out - extra) the rest is just the difference in taking the main feed around the perimeter assuming central roses (which was a simplification I was making here) and switches on walls etc.
I am missing some important point (this is entirely possible BTW!)?
On a full rewire, even if it were serious amounts of extra cable, that don't cost all that much (100m 1.5mm T+E = £15 from TLC, that would do about 25-50 switches in this mode unless the ceiling height is very large indeed!) ... much of this can be recouped from the cost of saved JB's of course at say £1 a go for a decent one.
Financially I can't see much in it. For me "maybe" I used an extra 100m of cable for the whole house (I really doubt this though), even so the cost of this is miniscule as compared to the rest of the job.
Agreed. That's the theory ;-). I still want to get at them if possible though!
I have not extended any of my boxes yet, I'll let you know though how it goes, when I do ;-)... but considering the twin two way switching in the kitchen the prospect does not fill me with fear (except in the kitchen itself, which admittedly might be tight).
Sorry ... 2 extra drops as mentioned above.
Also, apols if I was vague ... the bit about layout was meaning the potential additional extra cable around the perimiter is variable on layout. For example I have a number of wall lights on the perimiter of of my living room, using roses/JB's would not be much of an advantage on cable length as the feed would be roughly around the perimiter in any case barring the vertical sections. This is assuming I want to keep my feed close to the light fittings/or switches, which I would rather than hiding them in some arbitrary cable efficient place. In fact in this case the "traditional" approach could be wasteful of JB's and the cost argument could be the reverse here.
OK ... I mis-understood this point as I didn't think you were suggesting
*triple* and earth from the rose initially, as you were suggesting this was very wasteful of cable (not just 1 extra conductor). I don't think differentials betweed twin & triple are big, if that is what the point is?
However, I will bear that approach in mind FFR as it could come in handy in other situation ... cheers.
FYI I have three internal lighting circuits and only a single junction box between the lot of them & that was only due to the logistical difficulties of taking the feed in/and out of that particular location.
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