As far as I know none of those terminals ever fit more than 2 wires of any cross section properly... some people did manage to squeeze in 4 1.5mm2, but they're only listed for 2.
Good point, Ragnar.
I note that the terminals on the newer PDL (brand) sockets are considerably smaller than they used to be.
Now, you'd be lucky to get 2 2.5's into the terminals and this to a point annoys me somewhat, the reason being, while Mr Home-owner is trying to wire his new shed, he twists the wires up together as tight as he can until they fit.
What he may not know, that his pliers have chewed off quite a bit of the copper on the outside of the outer strands of the twist, or if he is really intent on getting the wires in there, he may even end up breaking the strands with excess pressure on the plier jaws.
Using pliers is something that needs to be done gently.
