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All answers should be written in complctc scntcnccs. Calculations should be shown in detail, and Code references should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC. 1. What is the full-load current of a 500-volt, DC, 20-horsepower motor? 2. Which NEC table is used to determine the full-load current of a torque motor? 3. What is the rated full-load current of a "-horsepower, 208-volt single-phase motor? 4. What are the minimum allowable ampacities of the phase conductors and the neutral conductor that are to supply a 2-phase, 3-wire, 230-volt, 30-horsepower motor? 5. What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor? 6. What is the full-load current of a 600-volt, 3-phase, 50-horsepower induction motor?
7. What is the minimum conductor ampacity, overload protection, and dual-element fuse rating for a circuit supplying a 560-volt, 3-phase, code ), 40°C, 125-horsepower motor with a nameplate full-load current of 115 amperes? 8. What is the minimum conductor size, overload protection, and inverse-time circuit- breaker rating for a circuit supplying a 230-volt, 3-phase, code A, 40°C, 75-horse- power synchronous motor operating at an 80% power factor with a nameplate full-load current of 185 amperes? 9. What size conductor would be required to supply three motors connected to a 440- volt, 3-phase branch circuit? Motor #1 is a 50-horsepower, code B induction motor; motor #2 is a 40-horsepower, code H induction motor, and motor #3 is a 50-horse- power, code ) induction motor. 10. What would be the rating of an inverse-time circuit breaker required for the branch circuit serving the three motors in the previous question? What would be the rating of a dual-element fuse? Inverse-time circuit breaker: Dual-element fuse:
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