In New Zealand the TPS wiring in houses is of the stranded type.
1 mm² is solid, 10 Amps max. (lighting)
1.5 mm² is stranded, 3 or 7 strands, 16 Amps max. (lighting)
2.5 mm² is stranded, 7 strands 20, Amps max. (powerpoints)
4 mm² ,, 27 Amps max. (range)
6 mm² ,, 32 Amps max. (range)
10 mm² submains 50 Amps
16 mm² submains 63 Amps
etc.
Connections do not burn up as long these are twisted properly, and folded over prior to inserting in the terminals of sockets and the like.