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Also, simple things that we do automatically others may miss. Electricians try to "fill" terminals with the copper conductor by either doubling over the solid copper wire or twisting and doubling over strands of flex before inserting into electrical terminals. I have seen others just push wire flex strands into terminals parallel, some strands just find themselves not securely gripped by the screw as they are positioned either side of it, others break off and serve no purpose. The terminal can then run hot. Simple fails often cause trouble for the partially experienced.
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