No, the purpose of three terminal ceiling. roses is to negate that.
Prior to that (ie back in the 70's) lighting circuits were run using single core cable, the live was run from one switch to the next. Neutrals were run in single core from one light point to the next. Switch wires were run from the switch to the lighting point. But no joint boxes.
Neglecting earth wire.
L&N cables starts at the CU and goes from one ceiling rose to the next all round the area in question.
Twin live goes from each ceiling rose to the light switch controlling it. (Except if a switch controls more than one rose.) Any two way switches as above but has three core cable between switch points. Intermediate switches (if any) are positioned on the three core.
Simple, virtually impossible to go wrong. Much better than previous methods. No joint boxes. Suitable for idiots and apprentices too.
Did you know that we have that on the wiki?
Did you know that such installations are still used?
It is.
That's not required.
However you are supposed to have a notice on the CU warning of the mixed colour change.
You seem to be assuming:
a. there's room in the fitting b. the customer does not mind you invalidating the warranty c. you can do so without invalidating the certification of the fitting d. there will be only a single cable to all such fittings - which begs the question what topology your design uses.
Drivel. No more that a switch is a junction box.
A ceiling rose is a junction box... what else could it be? Wires come in and go out, they join at screw terminals in the box - it serves no other function.
What you have described is what we call "loop-in" wiring. Common and standard practice that uses a junction box at every light fitting.
Apart from the one at the light fitting. Either in the form for a ceiling rose, or a "four terminal" box or similar for lamp fittings that don't use ceiling roses (which in many places these days will be all or most of them).
So harry, it seems your entire argument is simply one of semantics. You would wire a lighting circuit the same as anyone else, but like to argue that the junction box you use at each lighting position is not one so that you can claim their use is in some way deprecated.
Say you were wiring lighting positions that consist only of downlighters, no ceiling roses?
Obviously harry would use a bit of terminal block to connect the spare wires and hide it behind one of the lights back boxes or in the ceiling.
He appears to think you need three core cable for two way lighting for some odd reason.
Good question. (I was wondering as I sorted a neighbour's kitchen downlighter yesterday how Harry would have wired her 6 downlighters to a single switch.)
If the fitting had only a twin terminal block,/ I would substitute it for a triple.
What do yo suppose this for s*it-fer-brains.
They would be "daisy chained".
Today it used for a 3 phase fan in a hotel kitchen.
Live, neutral and switched live for a room stat for one. You don't need three core for n way lighting s*it fer brains, no sorry that's insulting s*it.
you don't "need" it. but for the drop to the switch it's tidier than 2 2 cores: L, Sw1 & SW2.
B***r. Of course by "red" I meant "live". ;) Just as you say "green light" to mean "proceed light" regardless of the fact that the bottom traffic light isn't actually green.
But harry can't do it that way as he doesn't use junction boxes so where would he wire in the second switch and/or intermediate?
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