Journeyman Electrician’s Exam Journeyman Electrician's Load Calculations 2 — Questions and Answers
Question 1: Per NEC 220.53, what demand factor applies when four or more fixed appliances (excluding ranges, dryers, space heating, or A/C) are installed in a dwelling unit?
- 50%
- 65%
- 75% (Correct answer)
- 100%
Correct answer: 75%
NEC 220.53 permits a 75% demand factor when four or more fixed appliances are installed in a dwelling unit.
Question 2: Per NEC 220.14(I), what is the standard load per outlet for general-purpose receptacles in commercial occupancies?
- 100 VA
- 150 VA
- 180 VA (Correct answer)
- 200 VA
Correct answer: 180 VA
NEC 220.14(I) assigns 180 VA per outlet for general-purpose receptacle outlets in commercial occupancies.
Question 3: Per NEC 220.14(G), what is the minimum load per linear foot used for show window lighting in a commercial load calculation?
- 100 VA
- 150 VA
- 180 VA
- 200 VA (Correct answer)
Correct answer: 200 VA
NEC 220.14(G) requires a minimum of 200 VA per linear foot for show window lighting loads.
Question 4: What demand factor does NEC Table 220.42 assign to dwelling unit lighting loads between 3,001 VA and 120,000 VA?
- 25%
- 35% (Correct answer)
- 45%
- 50%
Correct answer: 35%
NEC Table 220.42 assigns a 35% demand factor to dwelling unit lighting loads between 3,001 VA and 120,000 VA.
Question 5: Per NEC 220.61(B)(1), what percentage is applied to calculate the neutral demand load for electric clothes dryers?
- 50%
- 60%
- 70% (Correct answer)
- 80%
Correct answer: 70%
NEC 220.61(B)(1) requires the neutral load for dryers to be calculated at 70% of the feeder or service demand load.
Question 6: Per NEC Table 220.12, what is the unit lighting load for a bank?
- 1.0 VA/sq ft
- 2.0 VA/sq ft
- 3.0 VA/sq ft
- 3.5 VA/sq ft (Correct answer)
Correct answer: 3.5 VA/sq ft
NEC Table 220.12 lists banks at 3½ VA per square foot, one of the higher commercial occupancy lighting loads.
Question 7: Per NEC 220.51, what percentage of the total connected load must be used for fixed electric space heating loads?
- 65%
- 75%
- 80%
- 100% (Correct answer)
Correct answer: 100%
NEC 220.51 requires fixed electric space heating loads to be calculated at 100% of the total connected load with no demand reduction.
Journeyman Electrician’s Exam Journeyman Electrician's Load Calculations 2
Per NEC 220.53, what demand factor applies when four or more fixed appliances (excluding ranges, dryers, space heating, or A/C) are installed in a dwelling unit?