Question 8058 of 749 · Maryland Journeyperson Electrician Exam
Within how many seconds must a legally required standby system provide power after loss of normal supply?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 8058
- C: 60 seconds
Explanation
Section 701.12 requires legally required standby systems to have power available within the time needed for the application, but not more than 60 seconds. This is longer than the 10 second limit for emergency systems.
More questions: Motors, HVAC, Generators and Transformers
- 8061A transformer rated 1000 volts or less has primary protection only, and the primary current is 9 A or more. What is the maximum primary overcurrent device rating?
- 8062A small control transformer has a primary current of 5 A and primary protection only. What is the maximum primary overcurrent device rating?
- 8063A transformer with primary-only protection has a rated primary current below 2 A. What is the maximum primary overcurrent device rating?
- 8064A transformer rated 1000 volts or less has both primary and secondary protection. What is the maximum primary device rating?
- 8065With primary and secondary protection, what is the maximum secondary device rating for a transformer with a secondary current of 9 A or more?
- 8066A 45 kVA, 480 volt three-phase transformer has primary-only protection. What is the maximum standard primary breaker size?