NABCEP Safety Practices 2

Question 1

When working on a rooftop PV installation, what is the minimum approach boundary for unqualified workers near exposed energized conductors operating above 50V?

Accepted Answer

3 feet 6 inches

Answer

NFPA 70E defines the limited approach boundary for unqualified workers as 3 feet 6 inches for voltages between 50V and 750V.

Question 2

A solar installer notices the roof decking is wet after rain. What is the correct safety action before resuming rooftop work?

Accepted Answer

Wait until surfaces dry and re-inspect footing hazards

Answer

Wet surfaces create fall hazards; workers must wait for surfaces to dry and confirm safe footing conditions before resuming work.

Question 3

Which document establishes the lockout/tagout (LOTO) procedures that solar installers must follow when servicing PV systems?

Accepted Answer

OSHA 29 CFR 1910.147

Answer

OSHA 29 CFR 1910.147 is the Control of Hazardous Energy (Lockout/Tagout) standard applicable to servicing electrical equipment.

Question 4

What type of fire extinguisher is appropriate for use on a live PV electrical fire?

Accepted Answer

Class C (CO2 or dry chemical)

Answer

Class C extinguishers use non-conductive agents (CO2 or dry chemical) and are rated for energized electrical equipment fires.

Question 5

During a PV system commissioning, a worker must verify the string open-circuit voltage. Which PPE is required for this measurement?

Accepted Answer

Rubber insulating gloves rated for the voltage with leather protectors and safety glasses

Answer

Electrical measurements on energized PV conductors require rubber insulating gloves rated for the system voltage, leather protectors, and eye protection per NFPA 70E.

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

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

NABCEP Safety Practices 2