NABCEP Regulatory Compliance & Industry Standards 2 — Questions and Answers
Question 1: Which OSHA standard specifically governs electrical safety-related work practices for general industry?
- 29 CFR 1910.269
- 29 CFR 1910.333 (Correct answer)
- 29 CFR 1926.416
- 29 CFR 1910.147
Correct answer: 29 CFR 1910.333
29 CFR 1910.333 covers electrical safety-related work practices for general industry, including energized electrical work.
Question 2: Under NEC Article 690, a PV system's ungrounded conductors must be protected by an overcurrent device located where?
- At the point of load
- As close as practicable to the source of supply (Correct answer)
- At the main service panel
- Within 10 feet of any junction box
Correct answer: As close as practicable to the source of supply
NEC 690.9 requires overcurrent protection as close as practicable to the source (module or battery) to minimize unprotected conductor length.
Question 3: What is the primary purpose of UL 1741 as it relates to inverters used in grid-tied solar systems?
- It certifies inverter efficiency ratings
- It establishes safety standards for inverters and charge controllers (Correct answer)
- It defines interconnection tariff structures
- It sets maximum allowable harmonic distortion levels
Correct answer: It establishes safety standards for inverters and charge controllers
UL 1741 is the standard for inverters, converters, controllers, and interconnection system equipment for use with distributed energy resources.
Question 4: When a utility's interconnection agreement requires anti-islanding protection, which IEEE standard defines the requirements?
- IEEE 519
- IEEE 1547 (Correct answer)
- IEEE 929
- IEEE 1013
Correct answer: IEEE 1547
IEEE 1547 is the standard for interconnection and interoperability of distributed energy resources with associated electric power systems interfaces, including anti-islanding.
Question 5: An installer is working on a commercial rooftop PV system. Per OSHA, what is the minimum working clearance required in front of electrical panels rated 0–150 volts to ground?
- 2 feet
- 2.5 feet
- 3 feet (Correct answer)
- 3.5 feet
Correct answer: 3 feet
OSHA 29 CFR 1910.303 and NEC 110.26 both require a minimum 3-foot working clearance (Condition 1) for equipment rated 0–150 volts to ground.
Question 6: Which agency enforces the Toxic Substances Control Act (TSCA) that may apply to disposal of certain PV panel materials?
- OSHA
- DOE
- EPA (Correct answer)
- CPSC
Correct answer: EPA
The EPA enforces TSCA, which regulates chemical substances including cadmium telluride and lead used in some PV panel technologies.
Question 7: A residential solar contract must include a 3-day right of rescission under which federal regulation?
- FTC Cooling-Off Rule (Correct answer)
- HUD RESPA
- FTC Green Guides
- CFPB TILA-RESPA Rule
Correct answer: FTC Cooling-Off Rule
The FTC Cooling-Off Rule (16 CFR Part 429) gives consumers 3 business days to cancel door-to-door sales contracts over $25.
NABCEP Regulatory Compliance & Industry Standards 2
Which OSHA standard specifically governs electrical safety-related work practices for general industry?