Question 13117 of 938 · Maryland Journeyperson Electrician Exam
A 100 % rated circuit breaker assembly is listed for continuous operation at its full rating. What is the minimum such breaker rating for a 160 A continuous load?
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 13117
- A: 175 A
Explanation
When the assembly and the overcurrent device are listed for 100 % operation, the 125 % factor does not apply, so the device must be at least 160 A. The next standard size is 175 A; a standard rated breaker would need 200 A.
More questions: Electrical Calculations
- 13118A single-phase 240 volt, 10 kW heater operates for 3 hours. How many kilowatt-hours does it use, and what is its current?
- 13119What is the circular mil area of a 10 AWG conductor as listed in Chapter 9 Table 8?
- 13120A 240 volt, single-phase, 2 hp motor has a table full-load current of 12 A at 230 volts. What is the minimum branch-circuit conductor ampacity?
- 13121Three-phase 460 volt motors are rated 5 hp (7.6 A) and 3 hp (4.8 A). What is the minimum ampacity of a feeder supplying only these two motors?
- 13122A 9 kW, 480 volt, three-phase resistive heater is a continuous load. What is the minimum standard overcurrent device rating?
- 13123What is the inverse time breaker maximum for a 3 hp, 230 volt, single-phase motor (table FLC 17 A), allowing the next higher standard size?