In 2017 my family moved to a new construction. Despite having three-phase power, I've noticed that all the electrical connections are on just one phase. The main breaker for this phase occasionally trips, especially if we run many appliances at once (oven, two room heaters, water kettle, and the home lighting which is almost all LCD bulbs).
Is it normal for all circuits of the house to be on a single phase?
Might I reduce the phase breaker trippings by moving some circuits to other phases?
I am installing a three-phase 22 kW electric vehicle charging station this week (the car is limited to 11 kW), does that change the answer to the previous question?
I am installing a rooftop solar system without battery in the coming weeks, if that has any importance. This is in Israel, we use 230 V 50 hZ household electricity. I have read this similar question but the answers discuss what is possible, with an emphasis on the NA market, but do not discuss what it typical or even best practice for a greenfield three-phase installation.
Late addition:
This is the entire panel. Unrelated to this question, one of the circuits is down because after last week's rain it is tripping the RCD-GFCI. It feeds outlets in the exterior load-bearing wall in two adjacent rooms.
It appears that I was wrong. I thought that the three triple-breakers were main breakers for each phase. Thus, when only one is tripping (the one next to the RCD) and the whole house goes dark, I thought that the whole house was on a single phase. But that is not the case. Rather, that breaker is 25 amps and breaks all three phases. The 16 amp triple on the left goes to a room air conditioner, and I think that the 16 amp triple on the right is unused.
Close up of the main breaker and RCD from above:
Close up of the main breaker and RCD from below:
Close up of the two triples from above:
Close up of the two triples from below:
Is 25 amps really enough for the main breaker?
I do understand that it is 25 amps per phase, so that's 75 amps for the whole house. But a dozen 16 amp circuits shouldn't require a main breaker rated higher than 25 amps? I stress that this breaker pops often. I suspect that many of the heavy loads may be on a single phase, is that something that I can check? I think that using an ohmmeter with the main breaker tripped might work, but I'm not an electrician so I don't ever touch anything inside the panel without a professional.
Second edit, more information:
This is in a stand-alone home on half a dunam of land (1/8 acre) built in 2017. These are the high-load devices in the house, I do not know which devices are on which phases:
- 120 liter water heater
- Two 2 Kw IR bathroom heaters
- Four 1 horsepower room air conditioners
- One 1.5 or 2 horsepower room air conditioner for the common area
- Cooking oven
- 2 kW water kettle
- Three-phase electric range
- Washing machine
- Electric drier
- Dish washer
- Vacuum cleaner
- 2 kW portable IR heater for grandma, could get plugged into anywhere depending on where grandma is.
- Near future: three-phase electric vehicle supply equipment