Journeyman Electrician 26 practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q11A dwelling unit has 2,000 square feet of living area. Using the NEC general lighting load calculation, what is the minimum VA load assigned for general lighting?
✓ Correct answer: C. 6,000 VA
At 3 VA per square foot (NEC Table 220.12), a 2,000 sq ft dwelling requires 2,000 × 3 = 6,000 VA for general lighting load before applying any demand factors.
Topic: Branch Circuits, Feeders & Services
Q12How many VA is added for each two-wire small-appliance branch circuit when calculating dwelling unit loads?
✓ Correct answer: B. 1,500 VA
NEC 220.52(A) requires that each 20-ampere small-appliance branch circuit be counted at 1,500 VA when calculating dwelling unit feeder and service loads.
Topic: Branch Circuits, Feeders & Services
Q13According to NEC Table 220.42, what demand factor applies to the first 3,000 VA of general lighting load for a dwelling unit?
✓ Correct answer: D. 100%
NEC Table 220.42 (formerly Table 220.11) requires that the first 3,000 VA of general lighting load for dwelling units be calculated at 100% demand factor. The remaining load receives reduced demand factors.
Topic: Branch Circuits, Feeders & Services
Q14For a dwelling unit, NEC Table 220.42 applies what demand factor to general lighting load from 3,001 VA to 120,000 VA?
✓ Correct answer: A. 35%
NEC Table 220.42 specifies that the portion of general lighting load from 3,001 VA to 120,000 VA is calculated at a 35% demand factor, acknowledging that not all loads operate simultaneously.
Topic: Branch Circuits, Feeders & Services
Q15Feeder conductors must have sufficient ampacity to serve the loads they supply. At minimum, feeder ampacity must not be less than:
✓ Correct answer: C. 125% of the continuous load plus 100% of the non-continuous load
NEC 215.2 requires feeder conductors to have ampacity not less than 125% of the continuous load plus 100% of the non-continuous load, before applying any demand factors.
Topic: Branch Circuits, Feeders & Services
Q16A feeder supplies a continuous load of 40 amperes and a non-continuous load of 20 amperes. What is the minimum required feeder conductor ampacity?
✓ Correct answer: B. 70 amperes
Continuous load: 40 A × 125% = 50 A; Non-continuous load: 20 A × 100% = 20 A; Total = 70 A minimum. This is per NEC 215.2(A)(1).
Topic: Branch Circuits, Feeders & Services
Q17What is the minimum service size required for a new single-family dwelling unit according to the NEC?
✓ Correct answer: D. 100 amperes
NEC 230.79(C) requires a minimum 100-ampere, 3-wire service for any single-family dwelling unit. This ensures adequate capacity for modern electrical loads.
Topic: Branch Circuits, Feeders & Services
Q18Service entrance conductors run above ground outside a building must maintain a minimum clearance of how many feet above finished grade where subject to pedestrian traffic only?
✓ Correct answer: A. 10 feet
NEC 230.24(B) requires service conductors above roofs or over pedestrian areas to maintain at least 10 feet above finished grade for areas accessible only to pedestrians.
Topic: Branch Circuits, Feeders & Services
Q19Overhead service conductors crossing a public street with truck traffic must maintain a minimum vertical clearance of:
✓ Correct answer: C. 18 feet
NEC 230.24(B)(4) requires 18 feet of clearance over public streets, alleys, roads, or driveways subject to truck traffic to prevent contact with tall vehicles.
Topic: Branch Circuits, Feeders & Services
Q20The NEC limits the number of disconnects permitted at the service to a maximum of:
✓ Correct answer: B. Six disconnects
NEC 230.71(A) permits a maximum of six disconnecting means grouped at one location for a service. This is commonly called the 'rule of six' for service disconnects.
Topic: Branch Circuits, Feeders & Services
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