16. Which of the following are sometimes installed as an emergency system, legally required standby system, or optional standby power system for a building or structure? A. Generators B. Surge arresters C. Surge protection devices D. Transformers
16. Which of the following are sometimes installed as an emergency system, legally required standby system, or optional standby power system for a building or structure?
A. Generators
B. Surge arresters
C. Surge protection devices D. Transformers
17. The _______ is typically where the service main bonding jumper is installed or where the system bonding jumper is installed for a separately derived system.
A. site-isolating device B. equipotential plane
C. point of grounding
D. isolated power system
18. The grounded electrode conductor for a separately derived system is generally not required to be any larger than the largest _______ supplied by the system.
A. grounded derived phase conductor
B. equipment grounding conductor
C. common grounding electrode conductor D. ungrounded derived phase conductor
19. When rigid or intermediate metal conduit is installed in a hazardous location, it must be engaged by _______ threads into each connection.
A. 5 B. 3 C. 2 D. 4
20. A zigzag transformer is used to
A. ground a delta system.
B. provide a single phase 220 volt AC output. C. create two individual output voltages.
D. double the output current of the transformer.
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