New construction wired by professional electrician, Montana USA. Dedicated circuit for a 14" chop saw with 10 ga. wire and a 20 amp breaker. Saw was used previously on a 15 amp circuit with no problems. The saw is rated to draw 15 amps. The saw is a 14" Milwaukee abrasive wheel cut off saw with cord and plug, it is plugged into a 20 amp duplex GFI outlet. It trips the breaker immediately upon energizing. The electrician says he can not install a 25 amp breaker as it would be out of code. Any suggestions? In the comments section of this question mention was made to slow blow circuit breakers, I have been unable to find any information on these. Does someone know where info. can be found? I tried Square-D's site.
10 gauge wire can have a 30 amp breaker under the current National Electric Code. (and past ones too). Most places use the NEC, but some make changes.
I do not have my book right here, but if needed I can get you the exact section in the code for that data.
I am 'sure' he carries a current copy of the NEC with him, for reference.
Aloysius is also completely correct, a 15 amp rated motor will draw a much higher momentary start-up current.
The current will also increase if you stall the saw.