NABCEP Installation & Safety 2

Question 1

What is the minimum working space clearance required in front of electrical equipment rated 0-150V to ground per NEC 110.26?

Accepted Answer

3 feet

Answer

NEC 110.26 requires a minimum of 3 feet of clear working space in front of electrical equipment for systems rated 0-150V to ground.

Question 2

When installing a rooftop PV array, what is the primary purpose of required access pathways per the fire code?

Accepted Answer

To provide firefighters with safe roof access and ventilation points

Answer

Fire codes mandate rooftop access pathways so firefighters can safely reach the roof and create ventilation openings during a fire emergency.

Question 3

Which PPE is required when working on energized DC circuits in a PV system?

Accepted Answer

Insulated tools and appropriately rated insulating gloves

Answer

Working on energized DC circuits requires insulated tools and voltage-rated insulating gloves to prevent shock from the uninterruptible DC source.

Question 4

What is the maximum DC voltage rating of a PV system that can be installed on a one- or two-family dwelling per NEC 690.12?

Accepted Answer

600V

Answer

NEC 690.12 limits PV system DC voltage on one- and two-family dwellings to 600V maximum to reduce arc-flash and shock hazards.

Question 5

A solar installer notices that the roof decking is soft and spongy in one area. What should the installer do?

Accepted Answer

Stop work and notify the project manager or structural engineer

Answer

Soft or spongy decking indicates potential structural failure; work must stop and a qualified professional must assess the roof before installation continues.

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

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

NABCEP Installation & Safety 2