NABCEP PV System Mechanical Installation 3

Question 1

What wind exposure category would typically apply to a PV array installed on a building located in an open terrain with scattered obstructions?

Accepted Answer

Exposure C

Answer

Exposure C applies to open terrain with scattered obstructions generally less than 30 feet high, which increases wind pressure on structures.

Question 2

When calculating roof dead load capacity for a PV installation, what is a typical weight range for crystalline silicon PV modules?

Accepted Answer

2.5–4 psf

Answer

Most standard crystalline silicon modules weigh between 2.5 and 4 pounds per square foot including the racking system.

Question 3

Which of the following describes the correct sequence for installing a ballasted flat-roof racking system?

Accepted Answer

Verify tilt angle, install rails, attach modules, place ballast

Answer

Tilt angle must be verified first, then rails installed, ballast added to hold the system, and finally modules attached and secured.

Question 4

What is the primary reason for maintaining a minimum clearance between the bottom of PV modules and the roof surface?

Accepted Answer

To facilitate airflow for module cooling and debris removal

Answer

Adequate clearance promotes airflow under modules to dissipate heat, improving performance, and allows debris and water to clear.

Question 5

A 2×6 rafter is being assessed for additional loading from a rooftop PV array. Which document governs the structural capacity of wood framing members?

Accepted Answer

IBC and AWC NDS (National Design Specification)

Answer

The International Building Code (IBC) combined with the AWC National Design Specification governs the structural design of wood framing members.

(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 PV System Mechanical Installation 3