Note, however, that the National Electrical Code requires that a mechanical
fastener (such as a wire nut) must be used _in_addition_ to the solder.
A connection made by solder alone is a Code violation.

I always add a wire nut, but not for NEC -- more like sloth. It's
difficult to insulate the connection otherwise. Almost impossible with
just electrical tape.

I've examined the solder-dipped connections on my home (65 y.o.), and it
takes all day to pull off the fabric / tar taping. I have to use
pliers. Those guys didn't screw around, which is the way I like it, but
the connections are huge, about the size of my thumb or better. A wire
nut is so much easier...

--
Regards,
Doug Miller (alphageek at milmac dot com)