I am redoing some wiring in our house that involves breaking and
remaking some original connections -- ripping out and replacing boxes by
larger (e.g., two-gang by three-gang). I find that in some cases all the
conductors of the same color have been connected using crimps that have
then been taped over -- even the hots. Is this kosher? Surely wirenuts
provide better insulation than the tape. There could be 220/240 volts
between conductors in some boxes because there are Edison circuits involved.

Should I use wirenuts for the reconnections? Crimps and tape take up
less room.

And, while I think of it, is it OK to have circuits fed from different
breakers in the same box (e.g., outlet and light switch)? One could
assume that since the one circuit is dead (switched off at the panel),
the other is too.

Perce