Journeyman Electrician’s Exam Journeyman Electrician's Branch Circuits 5 — Questions and Answers
Question 1: A branch circuit in a commercial building supplies a continuous fluorescent lighting load of 24 amperes. The minimum overcurrent device rating must be:
- 25 amperes
- 30 amperes (Correct answer)
- 35 amperes
- 40 amperes
Correct answer: 30 amperes
NEC 210.20(A) requires the overcurrent device to be rated at least 125% of the continuous load: 24A × 1.25 = 30A.
Question 2: What NEC section addresses the minimum receptacle requirements for countertop surfaces in a dwelling unit kitchen?
- 210.8
- 210.11
- 210.52(C) (Correct answer)
- 210.60
Correct answer: 210.52(C)
NEC 210.52(C) specifies the placement and quantity of receptacles required for kitchen countertop surfaces.
Question 3: A branch circuit tap made within a panelboard must comply with NEC tap rules. Which condition permits a tap conductor smaller than the feeder?
- The tap is no longer than 10 feet and terminates in a single breaker rated for the tap conductor
- The tap is no longer than 25 feet and is no smaller than 1/3 the feeder ampacity (Correct answer)
- The tap is protected within 6 feet by an OCPD
- Taps within panels are never permitted
Correct answer: The tap is no longer than 25 feet and is no smaller than 1/3 the feeder ampacity
NEC 240.21(B)(2) permits a 25-foot tap rule when the tap conductor is at least 1/3 the ampacity of the feeder and terminates in a single breaker.
Question 4: In a guest room of a hotel, GFCI protection is required for all:
- 125-volt, 15- and 20-ampere receptacles (Correct answer)
- 240-volt receptacles only
- Receptacles within 3 feet of a sink only
- Lighting circuits only
Correct answer: 125-volt, 15- and 20-ampere receptacles
NEC 210.8(B)(2) requires GFCI protection for all 125-volt, 15- and 20-ampere receptacles in hotel and motel guest rooms.
Question 5: What is the maximum distance allowed between the overcurrent protection and a tap conductor in the 10-foot tap rule?
- 6 feet
- 10 feet (Correct answer)
- 15 feet
- 25 feet
Correct answer: 10 feet
NEC 240.21(B)(1) permits unprotected tap conductors up to 10 feet long when the tap conductor ampacity is not less than the combined loads supplied.
Question 6: A branch circuit supplying a motor must have an ampacity of at least:
- 100% of the motor full-load current
- 115% of the motor full-load current
- 125% of the motor full-load current (Correct answer)
- 150% of the motor full-load current
Correct answer: 125% of the motor full-load current
NEC 430.22(A) requires branch circuit conductors for a single motor to have an ampacity of at least 125% of the motor's full-load current rating.
Question 7: Under NEC 210.52(B), receptacles in a dwelling unit must be installed in every kitchen countertop space that is at least how wide?
- 6 inches
- 12 inches (Correct answer)
- 18 inches
- 24 inches
Correct answer: 12 inches
NEC 210.52(C)(1) requires a receptacle outlet for every countertop space 12 inches or wider in a dwelling unit kitchen.
Journeyman Electrician’s Exam Journeyman Electrician's Branch Circuits 5
A branch circuit in a commercial building supplies a continuous fluorescent lighting load of 24 amperes.
The minimum overcurrent device rating must be: