Not to my knowledge, as in generally available. So it's 30A then 60A. No doubt someone will come along with info about some Chinese manufacturer that makes a 45A jb, until then use the 60A and get the job done. If you’re wiring our electrical systems and keeping everything safe and organised, you’ll need a connector, built to the best standards of safety and efficiency I need to move my current shower switch connection by about 4 feet (1.2m). Problem is that the current cable is not long enough. Can anyone suggest what I can use extend this connection - I thought that it would make sense just to have a 45amp junction box - however don't seem able to find these in Screwfix catalogue. Are they available - if so, where? if not another suggestion please/