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NABCEP PVIP Exam Syllabus Topics:

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

1. What is the maximum allowable voltage drop for a PV source circuit conductor run of 100 feet, using 10 AWG copper wire, if the system operates at 48V DC and the design specifies a 2% voltage drop?

A) 0.96V
B) 1.92V
C) 0.48V
D) 1.44V

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) 17%
C) 10%
D) 25%

3. A PV system has a 1000V DC array feeding a transformerless inverter. What is the minimum insulation rating for the DC conductors per NEC 690.35?

A) 1000V
B) 600V
C) 1500V
D) 2000V

4. When installing an ungrounded PV system with an open-circuit voltage of 450Vdc and a maximum voltage of
3000Vdc which procedures should be followed to establish an electrically safe condition?

A) Apply lockout/tagout devices and install a listed isolation transformer.
B) Determine possible sources electrical supply an avoid exposure to energized conductors or parts.
C) Mount inverters on nonconductive supports and temporarily ground one dc circuit conductor.
D) Verify that disconnecting device blades are closed and test conductors using an adequately rated detector.

5. A PV system is installed on a dwelling with a single-phase 240V service. The inverter output is 7.2 kW. What is the minimum service conductor size per NEC 705.12 if the existing load is 50A?

A) 2 AWG
B) 1/0 AWG
C) 1 AWG
D) 2/0 AWG

Solutions: