The NEC generally provides prescriptive requirements for electrical installations and systems. A few performance requirements exist, such as performance testing rules of ground-fault protection of equipment and witness testing of emergency and legally required standby systems. The AHJ is required to conduct or witness the testing when installation is complete. How much do you know about testing?
Created by: Michael Johnston
1. For legally required standby systems, the time limit for generator start and transfer of power to the standby source must not exceed _____ seconds.
2. Which of the following is responsible for conducting or witnessing a test of the emergency system installation upon completion, and periodically thereafter?
A. The owner
B. The engineer
C. The contractor
D. The authority having jurisdiction
3. The required audible and visual “signals” related to the emergency source must indicate at least four key statuses: derangement of the emergency source, whether or not the emergency source is carrying the load, any malfunction of the battery charger, and if the source has a ground fault on the system.
4. Which NFPA standard provides information related to performance of emergency and standby power systems?
A. NFPA 70
B. NFPA 99
C. NFPA 101
D. NFPA 110
5. Unit equipment installed for emergency illumination must remain operational for _____ hours and not fall below _____% of the initial illumination.
A. 0.75, 50
B. 1.0, 25
C. 1.25, 40
D. 1.5, 60
6. The required witness testing for emergency systems is a performance-based requirement, and a written record (documentation) of the test and maintenance is not required.
7. What is the maximum time of transfer to an emergency power source after an interruption of the normal service to a building?
A. A time delay is prohibited
B. 5 seconds
C. 10 seconds
D. 60 seconds
8. Which of the following is not permitted as a power source for an emergency system?
A. DC microgrid
B. Solar PV system
C. Generator set
D. A separate service
9. Which of the following is not permitted as a power source for a legally required standby system?
10. Where high-intensity discharge lighting such as high- and low-pressure sodium, mercury vapor and metal halide is the sole source of normal illumination, the emergency lighting system must operate _____.
A. For 1 hour
B. For 1.5 hours
C. Until normal illumination has been restored
D. For not less than 60 seconds after the normal illumination has been restored