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Thanks.The advantage of the Wago is that the contact resistance is consistently low across time, temperature and cable types,
I knows guys who in the 1st fix will use Wagos inside the backboxes, connecting up a ring (or radial), and even the earth terminal of a metal backbox. The backbozes are double up as j boxes. They test the ring. Any wiring problems are identified before finishing trades turn up. Putting it right afterwards may be big problems.
Then the plasterers and painters come in doing their work. They leave the Wagos in place in the backboxes. Then on the 2nd fix, on a bench they prepared the sockets, by screwing into all the socket's tails of flexible 2.5mm cable, inc' an insulated earth wire, about 4 to 6 inches long. They then just quickly put the tails into the Wagos at the back of the back boxes. The socket easily pushes back in being on flex tails. Then test again. The speed, and ease, of instalation was much quicker.
Each socket is a spur. The 2.5mm flex tails to a double socket cannot be more than 26A with 27A rated cable. So OK.
I have found many terminal screws on the back of sockets can work loose over time - expansion-contraction, vibration from people walking on wooden floors, etc. This is then a potential fire situation, with maybe arcing, adding higher resistances to the ring, which may cause one leg of the ring to take most of the load, etc.
That is where Wagos, in the scenario I just outlined, where they take the rings load, not the terminal on the rear of the sockets, with sockets being spurs, are safer. Having Wago connections on the rear of sockets, as in Germany, adds another level of safety, in eliminating another potential failure/fire risk.
That they are not, but they add so much value in many ways. And are superb get out of jail solutions at times.I am a great fan of Wagos having been using them since the 1980s, but they don't have magical powers.