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NABCEP PV Installation Professional (PVIP) Board Certification Sample Questions:

1. A site survey indicates a residential roof with a 4:12 pitch facing 20° east of south. The local latitude is 35°N, and the optimal tilt for maximum annual production is equal to latitude. What adjustment should be made to compensate for the roof's orientation and tilt to achieve near-optimal output?

A) No adjustment needed; output loss is negligible
B) Rotate modules 20° west to face true south
C) Install adjustable racking to match 35° tilt
D) Increase array capacity by 5%

2. A racking system is designed for a wind speed of 120 mph. The site's design wind speed increases to 130 mph. What is the percentage increase in wind pressure?

A) 33%
B) 10%
C) 25%
D) 17%

3. Insulation resistance testing is being performed on the conductors of a 3-year-old PV system. With a constant high test voltage being applied to a dc conductor, the test results in a high resistance reading. Which does this finding indicate?

A) Wiring insulation has degraded and is resulting in leakage.
B) The conductor insulation is functioning as intended.
C) Typical module degradation has lowered the output of the system's strings.
D) Soling of modules has reduced the efficiency of the system.

4. When installing a ground-mounted PV array, which of the following grounding methods complies with NEC Article 690 requirements for equipment grounding?

A) Using a grounding electrode conductor connected to a separate ground rod for each array
B) Bonding all metal parts to the equipment grounding conductor tied to the main service ground
C) Connecting the module frames to the racking with bare copper wire only
D) Installing a ground-fault circuit interrupter (GFCI) on the DC side of the system

5. A PV technician is installing a 6.5KWac inverter using a 40A backfed breaker. The single line shows a 200A panelboard with a 200A breaker, but the installer finds that the panelbord actually has a 150A main breaker.
Which of the following is the CORRECT installation option?

A) Replace the 200A panel with a 150A panel.
B) Complete the installation as noted above.
C) Install a 30A backfed circuit breaker.
D) Change the main circuit breaker to a 200A unit.

Solutions: