the linked article suggests that the explanation refers to the area behind the door.
In such situations, a power outlet or electrical connection could be associated with a device located on or near the door.
Possible examples include electric door systems, door openers, or other components of a home wiring system.
Especially in older buildings, there may also be connections whose original function is no longer immediately obvious to today’s residents.
Not all electrical outlets are suitable for standard appliances.
Not all electrical outlets are intended for standard appliances.
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