Looped-in lighting wiring - the ceiling rose - Practical DIY LOOP-IN SYSTEMS . Loop-in lighting wiring is the modern cabling arrangements used in most installation. Generally it uses less materials and is quicker to install than radial (junction box) wiring - it can however, be a bit more complicated to work out the actual wires at a ceiling rose. House Wiring for Beginners - DIYWiki - DIY FAQ House Wiring for Beginners. From DIYWiki. Jump to:navigation, search. perhaps retaining access to light and power while working. With loop-in wiring, the cable from the ceiling rose to the switch has 3 conductors, namely earth, unswitched live and switched live.