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2.5mm electrical wire can use how many amp?

Updated: 12/7/2022
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Chan1403

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Q: 2.5mm electrical wire can use how many amp?
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I have a 15 amp breaker that supplys an outlet. An electrician came out and replaced it with a 30 amp. I asked about the wire size and he said it was ok. I'm not satisfied that it won't cause a fire.?

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