Hi, I just saw that there was a limit of the size of an electrical network (how many connection can be done on one network) 
running a server just for me and few friend, I'm not really concerned by the performances of the server, do someone know how can I connect more objects ? with a commant or just a plugin ?

Nevermind, I was just a big mistake between me and my friends, by not being able to connect to the root combiner, we thought that it was a limit of how mych things we can connect but in fact it's just that we can connect only sources of power on them.