Given: A motor: type=squirrel cage; 208V, 3-phase; 30HP; nameplate amps NEC; duty=cont.; start=autotransformer; design=A; no service factor. A separate overload relay which is responsive to over current protects against ove rload. The calculated size of the relay would NOT be sufficient to start the motor or carry the load. The separate overload relay to protect the motor would be permitted to be increased to a calculated trip current of:

Given: A motor: type=squirrel cage; 208V, 3-phase; 30HP; nameplate amps NEC; duty=cont.; start=autotransformer; design=A; no service factor. A separate overload relay which is responsive to over current protects against ove rload. The calculated size of the relay would NOT be sufficient to start the motor or carry the load. The separate overload relay to protect the motor would be permitted to be increased to a calculated trip current of: