Just fitted an Ikea wall light yesterday, and it wasn't as rubbish as I'd expected. Well thought out from an installation viewpoint, and it's one of those so-called double insulated ones. Inspection shows it's a good effort and I cant really envisage anything going wrong in normal use. Just as well, as the lighting circuit has no cpc...
However, the screw terminals are tiny. The original wall light is ceramic lantern-style, and I believe it has been installed for over 20 years. The original was connected as follows:
1. Two cables coming out hole in wall, with not much length on them.
2. Choc-block connectors from those wires feeding bell-wire
3. The bell wire is connected to a metal lampholder which simply sits in the bottom of the lantern
4. The lampholder is secured in place and "insulated" by clever use of bubble-wrap and double-sided sticky tape...
Anyway, those tiny terminals...
The circuit is wired in stranded singles, black and blue (It's in Spain) and weirdly the two cables are of different gauges...the smaller one just fitted into the terminal, the larger one was very tricky, but tight twisting and pliers eventually got it fitted. I'd have preferred to extend the original cables with something more suitable, but there's nowhere to put the extra cabling as the fitting has no room and you can't push extra cable back into the wall unless you bash a hole into the concrete wall.
I presume that when the original circuit was installed, the different gauge wires were just what they had on the van....