Yes, in in-wall boxes you use wirenuts, wagos or in the case you are out of space "u-boats" [a single screw, single pole terminal block]. In surface installations, a box mounted terminal block is sometimes used.

Does it damage the wires? Yes. You can't reuse the wires more than once or twice before you have to cut them back since you have lost some strands. Wagos appear to be even worse. Fortunately, you do not very often change installations. Otherwise, the wires would be very short very soon. [Linked Image]

[This message has been edited by C-H (edited 10-19-2003).]