I've heard knowledgable people comment that you should always connect electric devices (receptacles and switches) using the terminal screws, and not use the holes in the back of the device where you simply push the wire straight in. Why? I'm not an electrician; as a layman I'm thinking the holes are provided in a UL listed, code approved device, so apparently its okay to use them. What's the reasoning for not using them? Thanks for your input.
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