I've seen such screw and nut connections on 1mm2 copper wire, cloth covered, in residential wiring! Prior to the invention of "choc blocks" that's how wires were spliced in Austria! Even in a 1965 house (admittedly very conservative construction) all original splices are like that. To be honest where I didn't have to touch them I just retightened the screws and wrapped it with new cloth tape.
