Quote
Originally posted by sparky66wv:
In back-wired recepts the screw and backplate still provide pressure for the termination, rather than an internal spring/catch. But they will look similar in having holes in the back to insert the wires.[QUOTE]

Ah, so I was on the right track with my original reasoning. Thanks.

[QUOTE]
GFCI's usually have provisions for two back-wired conductors per screw.
These are considered quite dandy in my opinion whereas backplugged (spring/catch type) are not.

Have to agree with you there. Maybe I don't have enough experience of the push-in terminations to really comment, but I just don't like the idea of such a light form of connection carrying 15A.

By the way, our fittings all use screw connections, though not of the same type as yours.