CEI Electrical Code & Standards 2 — Questions and Answers
Question 1: Under the NEC, what is the maximum allowed voltage drop for branch circuits to ensure reasonable efficiency of operation?
- 1%
- 2%
- 3% (Correct answer)
- 5%
Correct answer: 3%
NEC 210.19(A) informational note recommends limiting branch circuit voltage drop to 3% for reasonable efficiency.
Question 2: Which NEC article governs the installation of patient care areas in health care facilities?
- Article 517 (Correct answer)
- Article 518
- Article 520
- Article 525
Correct answer: Article 517
NEC Article 517 covers electrical wiring and equipment installed in health care facilities including patient care areas.
Question 3: According to the NEC, a 20-ampere, 125-volt receptacle installed outdoors must be protected by which of the following?
- AFCI
- GFCI (Correct answer)
- Surge protector
- Double-pole breaker
Correct answer: GFCI
NEC 210.8(A) requires GFCI protection for 125-volt receptacles installed in outdoor locations.
Question 4: What is the minimum clearance required by the NEC between the top of a service entrance conductor and a window that opens?
- 2 feet
- 3 feet (Correct answer)
- 4 feet
- 6 feet
Correct answer: 3 feet
NEC 230.9(A) requires service conductors to be at least 3 feet from windows that open.
Question 5: Which NEC article specifically addresses the installation of solar photovoltaic (PV) systems?
- Article 690 (Correct answer)
- Article 695
- Article 700
- Article 705
Correct answer: Article 690
NEC Article 690 covers the installation of solar photovoltaic energy systems.
Question 6: Under NEC 300.4, where a raceway or cable passes through a wood structural member, a steel plate of at least what thickness is required when the edge is within 1-1/4 inches of the nearest edge?
- 1/16 inch
- 1/8 inch (Correct answer)
- 1/4 inch
- 3/8 inch
Correct answer: 1/8 inch
NEC 300.4(A)(1) requires a steel plate at least 1/8 inch thick to protect cables or raceways from nails and screws.
Question 7: The NEC requires that equipment grounding conductors be identified by which color when insulated?
- White or gray
- Green or bare (Correct answer)
- Black or red
- Orange or yellow
Correct answer: Green or bare
NEC 250.119 requires equipment grounding conductors to be identified by green insulation, green with yellow stripe, or bare copper.
CEI Electrical Code & Standards 2
Under the NEC, what is the maximum allowed voltage drop for branch circuits to ensure reasonable efficiency of operation?