old wiring - new rose?

if it wired loop in loop out to the switch,then you will have a bunch of neutrals in switch box,these you join together,and the live wires are all wired to the common on the switch,you still have a switch wire
so you will have a single live to the fitment,as the neutral will be connected in the switch box,

mm
January 2011

let me tell you how a lighting circuit is wired,
we do it two ways,either loop in loop out to the ceiling rose,or to the switch,that is a live and a neutral to the rose or to the switch,these come from the db,ok?then you have a switch wire,this runs to the switch from the rose,it may be coloured red and black,or,blue and brown,depends how old your house is,
if its red and black,then you connect the red wire to the loop in live in the rose,and the black wire to your lamp connection,at the switch,you connect the red to L1,and the black to L2,so when you turn the switch on,it puts power from the live loop in to the lamp.simple:-)

mm
January 2011

Thanks, Peccavi.

Russ

Russ
January 2011

Typically the red wires carry Live - They connect together and do not connect directly to the lamp. One Red wire will be power coming in and the other power going off to the switch - sometimes there's a third red wire running power to the next ceiling rose.

The wire returning from the switch is usually Black coloured and should Ideally have a red sleeve on it to show that it's switched live - this gets connected to the lamp's Brown Wire.

The remaining Black wire is the Neutral return path - this usually gets connected to the Lamp's Blue wire.

A problem of identification sometimes arises when there are three cables - there will be three black wires - two of them acting as a neutral and one of them switched live - get it wrong and it all behaves badly.

If you have only two black wires and just two reds - join the reds together and to nothing else - connect the lamp's wires individually and separately to each of the two black wires

Good luck.... Take care...

Peccavi
January 2011