Question 1: What is the minimum feeder or service load for cloth dryers in a dwelling unit?
- 5000 watts
- 2500 watts
- 4000 watts
- 6500 watts
NEC Reference: NEC 220.54
Previous
Panel and Switch Board- NEC Code Questions
Next
Over current Protection Practice Test Questions-2
NEC CODE
NEC 2023
Single family dwelling unit Practice Questions
NEC Code Questions : Single family dwelling unit calculations
TOPICS COVERED
NEC Questions
How this test works
Read each question carefully
Look for absolute words like always / never — they often distinguish the right answer.
Manage your time
You have 14 min for 9 questions. Skip tough ones and come back.
Progress is auto-saved
Your answers are saved locally — a page refresh won't lose your work.
Review your answers
After submitting you'll see every explanation and your NEC references.
Frequently Asked Questions
Yes — free, no signup required. Each question links to the relevant NEC article so you can study the code directly.
The National Electrical Code (NFPA 70) is the benchmark standard for safe electrical installation in the US. It is updated every 3 years by the NFPA.
Study the edition adopted by your state. As of 2025, most states use the 2020 or 2023 NEC. These tests are written to the 2023 edition.
The most tested articles are 100 (Definitions), 200–250 (Wiring & Grounding), 300–314 (Wiring Methods), 400–411 (Conductors), 430 (Motors), and 700–701 (Emergency Systems).
9
Questions
14 min
Time
70%
Pass
Timer starts immediately. Progress is auto-saved.
0
Correct0
Wrong0s
TimeSingle family dwelling unit Practice Questions — Question List
Question 2: If a single family unit consists of one air conditioner rated at 3 kW and fixed heating equipment rated at 2.5 kw? What is the total dwelling calculated load for both?
- 3 kW
- 2.5 kW
- 5.5 kW
- 1.5 kW
NEC Reference: NEC 220.60
Question 3: Service conductors supplying the entire one dwelling unit load can have an ampacity of .............. percentage the service rating.
- 83
- 75
- 95
- 80
NEC Reference: NEC 310.15(B)(7)
Question 4: As per NEC what is the minimum general lighting load that is used for branch circuit and feeder/Service calculations of a single family dwelling unit?
- 3 Volt-ampere per square foot
- 2 Volt-ampere per square foot
- 1 Volt-ampere per square foot
- 4 Volt-ampere per square foot
NEC Reference: NEC 220.12
Question 5: In a single family dwelling unit when four or more appliances are fastened in a place and connected to the same feeder then ....................... percentage demand can be applied in calculating total demand load.
- 75
- 85
- 83
- 90
Question 6: What is the minimum general lightening load required for 1500 square foot single family house as permissible by NEC?
- 4500 VA
- 4800 VA
- 3000 VA
- 1500 VA
Question 7: Which of the following lamp holders are used in 15 ampere branch circuit that is used to supply fixed lightening units in dwelling unit?
- standard duty lampholders
- heavy duty lamp holders
- both standard and heavy duty lamp holders
Question 8: All 15 or 20 ampere receptacle outlets installed in bathrooms of dwelling unit must always require ...........................
- non ground receptacles
- water proof receptacles
- Ground fault circuit interceptor ( GFCI)
- protective gaurd
NEC Reference: NEC 210.8(A)(1)
Question 9: for single family dwelling unit what is the minimum allowable rating of a 3 wire service entrance conductor?
- 125 amperes
- 100 amperes
- 150 amperes
- 175 amperes
NEC Reference: NEC 230.42(B)
Student Reviews
No reviews yet — be the first to share your experience!
Leave a Review