connections anyone can make
not everyone has access to the professional tools to properly swage a connector on. most people have what is found in homer d poe or worst marine. the crimping most people do is nothing more than using a pair of pliers to crush a soft alloy around stranded wire, this is just a weak physical connecting that is eventually going to corrode and sever the connection. a good comprimise is to use the connector to hold the wire and solder to maintain the connection which in effect meets the standards mentioned in other posts. by stripping the wire just a little long to where the wire sticks out of the barrel just a little bit, then soldier the very end of the wire to the connector, then coating the connection with liquid electrical sealant intended for this purpose. please not this only works with tinned wire. untinned copper wire will corrode starting anywhere air or moisture comes into contact with the copper, then the corrosion wicks up inside of the insulation and can travel through the insulation from end to end.