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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 PV output circuit requires a disconnecting means per NEC 690.13. Where must it be located?

A) Within 10 feet of the array
B) At the main service panel
C) Within sight of the inverter
D) At the point of interconnection

3. A rooftop PV array has conductors running through a conduit exposed to sunlight on a roof with an ambient temperature of 40°C. The conduit is 2 inches above the roof surface. What is the NEC temperature adjustment factor for 90°C-rated conductors?

A) 0.91
B) 1.00
C) 0.87
D) 0.96

4. While surveying a potential three-phase project, an installer measures the voltage at the point of utility interconnection. The results are as follows:
* Phase to phase: 240V
* Phase A neutral: 120V
* Phase B neutral: 208V
* Phase C neutral: 120V
Which is a likely cause of these reading?

A) Phase-to-phase power imbalances
B) Missing ground in the transformer
C) Supply-side ground fault
D) High-leg transformer configuration

5. A PV system designer is selecting an inverter for a 12 kW array with a maximum power point voltage range of 300-450V DC. Which inverter specification is most critical to verify compatibility?

A) DC input voltage operating range
B) Maximum AC output current
C) Nominal AC output voltage
D) Inverter efficiency rating

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