What size cable do you use for new lighting circuits?

[LukeD]

1mm for me, unless I'm wiring a palace.

• Cheaper
• Thinner, so can cram more into a busy backbox
• Easier to terminate: You get some tiny terminals on things these days - dimmer modules being a prime example. Getting more than 1 X 1.5mm in them can be impossible.

THis is a issue .. terminal sizes are rubbish now

 

[UNG]

I hate fault finding on a lighting circuit wired in 1mm² cable you invariably end up spending more time fixing broken / snapped cables than finding the fault
Another argument for using 1.5mm² especially on the upstairs lighting is that it is quite often used to supply the aerial amp in the loft, although some of the newer aerial amps can be supplied though the co-ax using an inline power injector from a socket behind the TV