NABCEP PV System Mechanical Installation 2

Question 1

When installing PV modules on a roof with asphalt shingles, what is the primary purpose of flashing around roof penetrations?

Accepted Answer

To prevent water infiltration at penetration points

Answer

To improve module aesthetics

Answer

To increase structural load capacity

Answer

To reduce wind uplift forces

Question 2

What is the maximum allowable deflection for a rack mounting system under design load conditions per most structural standards?

Accepted Answer

L/240

Answer

L/120

Answer

L/180

Answer

L/360

Question 3

Which fastener type is preferred for attaching aluminum racking to steel purlins in a commercial PV installation?

Accepted Answer

Stainless steel bolts

Answer

Galvanized steel bolts

Answer

Aluminum rivets

Answer

Cadmium-plated screws

Question 4

A ground-mounted PV array is located in a region with a frost depth of 42 inches. What is the minimum embedment depth for the support posts?

Accepted Answer

Below the frost line

Answer

24 inches

Answer

36 inches

Answer

At the frost line

Question 5

When using a torque wrench to tighten module clamps, why is it critical to follow the manufacturer's specified torque values?

Accepted Answer

To prevent frame damage and ensure proper clamping force

Answer

To meet electrical code requirements

Answer

To comply with OSHA fall protection rules

Answer

To satisfy utility interconnection standards

Question 6

What is the purpose of a 'mid clamp' in a standard PV racking system?

Accepted Answer

To secure two adjacent modules at their shared frame edge

Answer

To attach the rail to the roof attachment point

Answer

To connect rail sections end-to-end

Answer

To ground the racking system

Question 7

On a standing-seam metal roof, which attachment method is generally preferred to avoid roof penetrations?

Accepted Answer

S-5! or equivalent seam clamps

Answer

Lag screws through the seam

Answer

Through-bolted L-feet

Answer

Adhesive-bonded mounts