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A 60-horsepower, 3-phase, 208-volt squirrel-cage motor is installed with a motor nameplate full-load current rating of 165 amperes. The minimum ampacity of the branch-circuit conductors is calculated to be 211 amperes. The branch-circuit conductors are required to be not less than 4/0 AWG THWN copper, and they are installed in a two-inch rigid metal conduit. The maximum rating of the motor branch-circuit short-circuit and ground-fault protective device using time-delay fuses has been calculated to be not greater than a 350-ampere time-delay fuse when starting current is a problem. Therefore, this motor with 4/0 AWG THWN copper conductors and a full-load current of 169 amperes can be protected by a 350-ampere time-delay fuse.

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