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1. They don't "always" insist on working on live circuits. Sometimes they feel confident enough that they don't want to take the trouble; but it's never a good idea. Just as any trade dealing with hazardous conditions, people often become complacent, and push the rules of safety.

2. Not all electricians work on live circuits unnecessarily.

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Q: Why do Electricians always insist on working on live circuits when rewiring something instead of turning off the power first?
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