For my case, with MH, powerheads, return eheim pump from my sump, PH for skimmer, 6 fans and 2FL, they all originate from two powerpoints and has since increased to six. My dad is in the construction line and he got his electrician friends to do the wiring for me. According to him, it is ok leh... Seems like the amount of electricity coming into the flat doesn't really drop unlike in private semi-d or terrace house.