Solved. Don't run a power cord from one room into another, either through a wall or through a doorway, window, or such like, even if a product description says you can. Walls can shift and doors and windows can scrape insulation. The wire can short-circuit and start a fire. Instead, you need to install conduit (a type of hard metal pipe) in a wall to hold wire and connectors at both ends or sometimes armored BX cable inside a wall. Check local laws for what you're allowed to do. In my city, the government evicted everyone from a residence, making at least one person homeless, apparently partly for that one type of violation. A computer retailer selling a device with a 25' built-in cord wrote on its website that you can plug the device in one room and mount it in another; I wrote to the retailer and proposed a correction and they promised to consider it; and, if I'm right about which product it was, they made the change.
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