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Feb 7 at 14:21 comment added Klaws Additionally, the heavy use of the wire causes thermal expansion, and when power goes off, the wire contracts again. In some treminals (like screw terminals), the can cause wear which decreases the contact patch size over time (like a few decades). The smaller contact patch has a higher resistance and in turn generates more heat, aggarvating the issue. So even wehen the connection was tight and secure 30 years ago, it might have evolved into situation described by Solar Mike. Water heaters, dishwashers, heaters, laundromates, EV chargers are typical candidates for occasional high current.
Feb 6 at 22:16 vote accept JBurt
Feb 6 at 9:15 history answered Solar Mike CC BY-SA 4.0