In Europe lugs are typically rated for two conductors, but people tend to cram in 3 or more. "Man, those old screw terminal receptacles were far better than the new push-in ones! You could get in up to 4 wires instead of just two!" (that's what an electrician told me 3 years ago). I've even seen breakers with 1.5mm2 solid, stranded, 2.5mm2 solid,... crammed into one lug. Not very sturdy.
