Often the breaker is in the main service panel and so there is no way to cut power to the panel. This means they will be working with live current and exposed electrified conductors. This is dangerous work and requires caution and appropriate safeguards. If you don't have a lot of knowledge and experience with this kind of things, you should call a professional electrisian.
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Often the breaker is in the main service panel and so there is no way to cut power to the panel. This means they will be working with live current and exposed electrified conductors. This is dangerous work and requires caution and appropriate safeguards. If you don't have a lot of knowledge and experience with this kind of things, you should call a professional electrisian.