Posted by kito169 on December 13, 2016 at 13:49:38 from (209.40.130.245):
My buddy has two Ingersol Rand two stage compressors with 5 hp motors on them. They were each on a 30 amp 240 volt circuit breaker with #8 ga solid copper wiring. They were about 75 feet from the breaker panel. One of them would trip the circuit breaker on startup occasionally. This week we moved them to a new building. He put them on 40 amp breakers, with 8 ga wire, and there is no problem now.They are only 30 feet from the breaker panel now. I checked them both with an Amprobe. They both go up to 152 amps on startup but run on 22 amps after initial startup. This is on just one pole/wire of the 240 volt breaker. I can't understand why the one compressor would trip the 30 amp breaker but not the other compressor would not. It seems to me since they are both pulling 152 amps on startup both would trip the breaker. I'm guessing the breakers are slow to trip to account for startup. John T and some other folks on here always give clear explanations so I told my friend I would ask about it. Thanks in advance for your replies. Rick
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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