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

1. 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) 25%
B) 10%
C) 17%
D) 33%

2. A metal condult containing an array circuit with Vmo of 400Vdc is connected to a metal enclosure at the location where the concentric knockouts have been punched by the manufacturer. Which method of attachment should be used?

A) Sealing locknut
B) Insulated bushing
C) Grounding bushing
D) Threaded coupling

3. With all other environmental parameters being the same, which would be the expected reduction in KM performance of a PV system after an irradiance drop from 810w/m2 to 740w/m2?

A) 9.5%
B) 7.4%
C) 10.2%
D) 8.6%

4. A PV array is installed at a site with an annual average temperature of 25°C and a maximum recorded temperature of 45°C. The module Voc is 50V at STC, with a temperature coefficient of -0.32%/°C. What is the maximum string voltage at the coldest expected temperature of -10°C?

A) 560V
B) 540V
C) 580V
D) 600V

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

Solutions: