Need help finding an electrical code rule

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I was on a job site, and the electrician wired the 10 HP air compressor with a 3 phase 480v and a 230 single phase circuit. Both circuits go to the same box on the compressor. The 480 feeds the motor apparently through the contactor (but the compressor was setup for 230v 3phase). And 230 single phase feeds the contactor start/stop. Edit: the 480 has a new disconnect from a 480 panel and the 230v comes from a breaker in the 230v 3phase panel. To make matters worse, the AC was wired up with a 30 amp 230v 3 phase breaker.I know this is illegal, as anyone who took any electrical safety or lock out tag out class can state.I just want to find the code printed out about it.This electrician actually stalked me by sitting at my coffee place for probably an hour just to wait for me to bitch that I dont know what I am talk about, but he has at least 10 separate violations in this room alone. What a person who hasn't left high school yet lol.Last edited by Country Metals; 5 Hours Ago at 10:02 PM.
Reply:I'll have to research that. I have installed a great many motor controls with 120 volt single phase controls operating 480 volt motors. I'm not aware that is prohibited. One facility has a panic system. From numerous places in the facility anyone can shut the whole place down pushing any one of several emergency stop buttons. The fire alarm also can shut down. Most all controls work on single phase & I'm not a fan of miles of control wiring run at 480 or even 277.We lock out/tag out the disconnect for a motor, downstream of the contactor. I guess you could lock out a disconnect upstream from the contactor, but locking out motor power would still prevent unintended start up.Last edited by Willie B; 5 Hours Ago at 10:10 PM.An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.