NABCEP Regulatory Compliance & Industry Standards 2

Question 1

Which OSHA standard specifically governs electrical safety-related work practices for general industry?

Accepted Answer

29 CFR 1910.333

Answer

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?

Accepted Answer

As close as practicable to the source of supply

Answer

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?

Accepted Answer

It establishes safety standards for inverters and charge controllers

Answer

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?

Accepted Answer

IEEE 1547

Answer

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?

Accepted Answer

3 feet

Answer

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.

(NABCEP) Certified North American Board of Certified Energy Practitioners Specialist Practice Test

(NABCEP) Certified North American Board of Certified Energy Practitioners Specialist Practice Test

NABCEP Regulatory Compliance & Industry Standards 2