New light fitting

[teash]

I was just about to replace a few ceiling roses with some fancy lights (not my idea it was SWMBO`s) anyway i`ve uncrewed the fitting and its got more wires inside than previous ones i`ve replace, I presume it has something to do with the house having smoke alarms wired to the mains. Anyhooo should this be left to an expert or can I tackle it myself?, if so how go I go about it.
BTW the new lights have only a chocolate block on them with provision for just the 3 wires.

 

[Spark123]

Firstly, note which wire goes where before you start!
You may find the original wiring is what is called loop in lighting where there is a supply in, supply out and a switch wire, you will find you need an additional piece of terminal block if this is the case. If you look in the wiki there are various guides on how to go about this.
//wiki.diynot.com/electrics:lighting:rose
In this guide, you may find the wire which connects to your L is black, if so it should have a red sleeve on it to signify it is the switched live. (This is of course assuming your wiring is in red/black.)

 

[teash]

Cheers for that spark, the house had a full rewire only 6 months ago so I think i`ll be calling em back to fit these for me. Best left to the experts I think

 

[Spark123]

OK, just for info, the information provided above is for the old colour scheme, with the new harmonized colour scheme where red has been replaced with brown, black has been replaced by blue.

 

[dingbat]

BTW the new lights have only a chocolate block on them with provision for just the 3 wires.

Seventeenth Edition DPC Regulation 559.6.2.1 "The installation of through circuit wiring in a luminaire is only permitted if the luminaire is designed for such wiring."

So, now it's our fault that lighting designers have no idea of UK standard wiring practices. Looks like it's going to be loop-in-at-switches from now on.