Hello. In the apartment I have a connection power of 5kW, protection 25A. The power of the devices is constantly growing, some new kettles, irons are almost 3kW each, so I am thinking of increasing the connection power and switching to 3 phases. I have 4 4mm wires connected to my apartment (no protective wire) so separation is possible. At the moment, after turning on the 3000W iron and 2100W kettle, I already have the theoretical contractual power of 5kW exceeded, the protection is 25A, so the maximum power is actually 5750W. Standard appliances in the apartment - washing machine, dryer, electric kettle, iron, plasma TV, microwave, oven, computer, laptop, etc. In some blocks electronic meters are already installed that control the maximum power and probably in some time the supplier will check whether someone does not exceed contracted power. I think it is worth dividing into 3 phases, 16A protections which will give a power of 11kW. After switching to 3 phases, I would divide the circuits, e.g. kitchen into one, rooms and lighting into another, bathroom into a third. Do you know how much it costs at PGE to increase the connection power by 6kW if it is a flat and the wires are already there, there is also a three-phase access to the connection point. There are amounts of about PLN 150 per kW on the Internet, but in most cases it is about houses and new cables, more work when connecting. In my case, all that is needed is a meter replacement and new security measures. Thank you in advance for your answer and I wish you a happy holiday.
, I tried to replace it with 3f, when I counted the costs, I assumed priority points 
