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The problem with getting a breaker bigger then what is recommended is that if you do accidentally ground or short one line, you will draw a lot of amps through that line. Basically high amps draw a lot of heat. Thus if the breaker didn't trip and remained closed, the wire insulation will catch on fire! Generally starts at the connections. I've seen many of these incidents at work and is very scary. Also the use of a wire undersized will result in the same effect.
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