1._____ must not be installed beneath openings through which materials may be moved, such as openings in farm and commercial buildings, and must not be installed where they will obstruct entrance to these buildings. A. Overcurrent protection devices.     B. Overhead-service conductors C. Grounding conductors                   D. Wiring systems

16. Flexible metal conduit will be installed between a raceway and a transformer in a system. If it's to serve as an equipment grounding conductor, the flexible conduit and its fittings must be less than _______ feet. A. 2 B. 6 C. 10 D. 4 17. In which of the following situations can an equipment ground conductor be run separately from the circuit conductors? A. When you install a GFCI and are connecting additional receptaclesB. When the connection is to be made to a nearby water pipeC. When you're replacing an ungrounded two-wire receptacle with a grounded receptacle D. When there are no spare conductors in the cable 18. A 400-amp circuit breaker protects a feeder that's installed in a nonmetallic raceway that requires an equipment grounding conductor. Which of the following is the minimum size of aluminum equipment grounding conductor that should be used in this situation? A. No. 4B. No. 1C. No. 6 D. No. 2 19. Which of the following is bonded to the grounding electrode system…

28. A multiwire circuit must consist of conductors connected to ____. Select one: A. THE SAME PHASES B. DIFFERENT BRANCHES C. THE SAME BRANCH D. DIFFERENT PHASES

Airframe Electrical System Question: Which wire installation type has the best rating and is the most resistive to breakdown in a chemical environment? (Source: FAA AC 43.13-1B/2B)

3.a. There may be installations where grounded conductors of different systems are installed within the sameraceway, cable, or box. In these cases, it's imperative that the system-grounded conductors remainA. spliced.B. disconnected.C. separated.D. buried.3.b. In dwelling units, the maximum allowable voltage between conductors that supply lighting fixtures isA. 220 V.B. 120 V.C. 115 V.D. 110 V.

6.a. The amount of short-circuit current that flows depends upon the amperes available at the source ofpower, the length of the circuit, and what other primary factor?A. The presence of a ground fault currentB. Proper installation of the branch circuitC. Presence of no previous damage to the electrical systemD. The size of the conductors and voltage at which they operate6.b. You're evaluating the components of a multioccupancy building that won't have an on-site employee. Tobe compliant with the NEC, each occupant will need to have access to their ownA. service-disconnecting means.B. service conductor.C. cable attachment point.D. emergency fire water-pump disconnect.

Explain the importance of power system protection. Discuss various types of protection devices and strategies used to safeguard electrical infrastructure from faults and disturbances.