Journeyman Electrician’s Exam Journeyman Electrician's General 3 — Questions and Answers
Question 1: What is the minimum size copper equipment grounding conductor (EGC) required for a circuit protected by a 60-amp overcurrent device?
- 14 AWG
- 12 AWG
- 10 AWG (Correct answer)
- 8 AWG
Correct answer: 10 AWG
NEC Table 250.122 requires a minimum 10 AWG copper EGC for circuits protected by overcurrent devices rated up to 60 amps.
Question 2: A receptacle outlet must be installed so that no point along the floor line of a wall in a dwelling unit is more than how far from a receptacle?
- 4 feet
- 6 feet (Correct answer)
- 8 feet
- 12 feet
Correct answer: 6 feet
NEC 210.52(A) requires receptacles in dwelling unit living areas such that no point is more than 6 feet from a receptacle along the floor line.
Question 3: Which conductor color is PROHIBITED from being used as an ungrounded (hot) conductor in a building's wiring system?
- Blue
- Orange
- Green (Correct answer)
- Red
Correct answer: Green
NEC 250.119 reserves green (and green with yellow stripes) exclusively for equipment grounding conductors; it cannot be used for ungrounded conductors.
Question 4: What is the purpose of the neutral conductor in a 120/240V single-phase, 3-wire service?
- It provides a return path only for 240V loads
- It carries unbalanced current from 120V loads and serves as a common return (Correct answer)
- It is required only for GFCI protection
- It carries the full load current from all connected loads
Correct answer: It carries unbalanced current from 120V loads and serves as a common return
The neutral carries the difference (unbalanced) current between the two hot legs for 120V loads and serves as the common return path.
Question 5: What minimum clearance must unguarded live parts operating at 601–2,500V require from grounded parts in working space?
- 1 foot
- 2.5 feet
- 3 feet (Correct answer)
- 4 feet
Correct answer: 3 feet
NEC Table 110.26(A)(1) Condition 1 specifies a minimum 3-foot working clearance for voltages from 601 to 2,500V to ground.
Question 6: When installing EMT in a wet location, which of the following is required?
- EMT is not permitted in wet locations under any circumstances
- Fittings and connectors must be listed for use in wet locations (Correct answer)
- The conduit must be coated with a waterproof sealant
- EMT must be replaced with RMC in wet locations
Correct answer: Fittings and connectors must be listed for use in wet locations
NEC 358.10(B) permits EMT in wet locations provided fittings and connectors are listed for wet locations.
Question 7: A single-pole breaker protecting a 120V, 20-amp circuit must be capable of interrupting how much fault current to be considered adequate?
- The breaker must match the available fault current at the installation (Correct answer)
- Any UL-listed 20-amp breaker is automatically adequate
- At least 5,000 amps
- At least 10,000 amps
Correct answer: The breaker must match the available fault current at the installation
NEC 110.9 requires that all overcurrent devices have an interrupting rating equal to or greater than the available fault current at the point of installation.
Journeyman Electrician’s Exam Journeyman Electrician's General 3
What is the minimum size copper equipment grounding conductor (EGC) required for a circuit protected by a 60-amp overcurrent device?