In what context? Fusebox, socket-box, or within a length of wire pulled into conduit, etc? Insulated conductor, or just a sleeved end? I leave the regulations aspect to others who'd know better to comment on. Just based on what I'd feel happy with, I'd not want to have this within a conduit and yet I'd tolerate it in e.g. a box where it's well done, inspectable, not strained, and avoids changing an awkward run of cable.
In what context? Fusebox, socket-box, or within a length of wire pulled into conduit, etc? Insulated conductor, or just a sleeved end? I leave the regulations aspect to others who'd know better to comment on. Just based on what I'd feel happy with, I'd not want to have this within a conduit and yet I'd tolerate it in e.g. a box where it's well done, inspectable, not strained, and avoids changing an awkward run of cable.