Which traits should I look for when purcashing plugs for self-assembled power cables?
Having bought some Chinese sh@# recently here is what I am looking for:-


Effective strain relief to prevent pulling of wires on terminals.
Good quality materials for all electrical connections, brass preferred for corrosion resistance and conductivity, poor quality plated steel comes nowhere near this requirement.
Good quality connections between conductors and wire. I have seen some very bad clamp designs. I much prefer the hole and screw idea again with the caveat that the materials are good and the screws are not going to strip or the conductors break as soon as you put any torque on them.