Please help with these. 32. A thre-phase motor is running excessively hot. Cive
ID: 2305784 • Letter: P
Question
Please help with these.
32. A thre-phase motor is running excessively hot. Cive two possible causes and correction procedures which could fix the problem. 1. Cause: Correction: 2 Cause Correction: 33. Explain how the rotation of a capacitor start/induction run single-phase motor is rever as listed in Tables 430.247 through 430.250 must be used for sizing motor circuit conductors and short circuit /ground fault protection devices. 34. The motor Overload devices are intended to protect motors, motor-control apparatus, and motor branch circuit conductors against short circuits and ground faults. True or False (Circle one) 35. Size the branch circuit short circuit and ground fault protection for a 230 volt, 7.5 HP, single phase motor, Code letter K, with a nameplate current of 36 amps. Use dual-element time delay fuses. Show work. 36. 37. Determine the minimum size motor branch circuit conductors for a three phase, 25 HP, 460 volt motor with a nameplate rating of 30 amps. Termination ratings are 75 degrees C. Use THWN-2 conductors.Explanation / Answer
32)
Cause : Every electric motor has a design temperature. If a motor is started off at a bad current value, it starts operating in a much warmer condition than the design temperature.
Correction : It is very important that the motors should be matched with their ideal current values.
Cause : Overheating also occurs when an electric motor is forced to operate in a high temperature environment. This causes the rate at which heat can be conducted to reduce at an alarming rate.
Correction : The area where electric motors are operating must have a proper cooling system and a ventilation system should be there in case the cooling system stops working.
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