Resetting a tripping breaker over and over without finding the cause
A breaker that keeps dropping is doing its job; the fault is still there. Repeated forced resets stress the breaker and, in worn boards, can overheat the buswork behind it. Reset once after unplugging the circuit's appliances; if it will not hold, stop and book a diagnosis.
Booking tower work without checking permit rules first
Many managed buildings turn contractors away without a work permit or landlord NOC, and some restrict noisy work to weekday hours. The result is a paid visit that ends in the lobby. One message to building management before you pick a slot avoids the wasted call-out.
Treating outdoor electrics like indoor electrics
Indoor-grade junction boxes in flowerbeds, unrated extension cords feeding garden lights and balcony sockets without covers all fail the same way: moisture gets in, the RCD starts tripping, and the search for the wet joint costs more than proper IP-rated fittings would have. Outdoors, specification is the economy.