Hello - please forgive this novice question. How are wires secured from the outside into electrical appliances/products? It doesn't seem as simple as creating a hole the same diameter as the input power wire. See the attached photo for an example of a fan. It seems there is some type of heat shrinking going on? I'm just curious how to secure a wire inside a product so it doesn't become loose, or when you pull on a wire it doesn't pull on the internal PCB. Hope I'm making sense here.
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