We have an intermittent problem whereby the elevator (60hp) in an all-new construction building trips the 2000A main breaker. The breaker downstream of the main feeding the motor never trips. This happens 3-7 times every week while this building is under construction. The engineer for the electrical equipment input their settings. He insists that they were set correctly. We have since raised the amps from approximately 1600A to 1800A but the problem persists. Obviously, the possibility for tripping will increase once the building is occupied. Is there another main breaker setting that could be incorrect? Could something be wrong with the elevator motor or controls? The engineer says that having the main trip before the downstream breaker is normal. Is that possible?
