Turning off the circuit breaker after a short rainfall

Dear Master! I live in a private house. In my basement is a water pump and a boiler. They are included in one extension cord, the wire of which goes through the ceiling of the basement to the terrace and is included in a short extension cord, which includes a refrigerator and then this is in the shield of the machine, which is located on the terrace wall. So on this outlet included a boiler, hydrophore and a refrigerator. An outlet in the bathroom, where I periodically turn on the washing machine and two outlets in the kitchen. On one electric kettle and microwave, on another stationary comp. Last week, an automatic machine (main button) was cut down and I pulled a boiler out of the extension cord and everything worked again, and after a couple of hours I switched it back on the same extension cord. Everything worked great for a week. A week later, everything repeated. True, on the eve of both the first and second cases there was a short rainfall (in the basement the walls and floor are completely dry). Maybe because of this there was a voltage drop and it knocked out the machine. Is it possible? Please advise what to do. Respectfully Selivanova Vera.