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NABCEP PVIP Exam Syllabus Topics:

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

1. During commissioning, a PV system's measured Voc is 10% lower than expected. What is the most likely cause?

A) Shading on one module
B) Open circuit in a string
C) High ambient temperature
D) Inverter malfunction

2. When doing initial inspections on a PV system that was installed using racking that is not compliant with UL.
2703, an inspector should pay special attention to which electrical attribute?

A) Racking needs to be bonded to a supplemental grounding electrode conductor.
B) The grounding conductor must be bonded directly to the primary grounding electrode.
C) Each PV module needs to be bonded to the equipment grounding conductor.
D) The equipment grounding conductor must be irreversibly spliced.

3. 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) 1 AWG
B) 2 AWG
C) 2/0 AWG
D) 1/0 AWG

4. On a PV system larger than 100kw, which PV array design will provide the HIGHEST degree of performance monitoring.
Granularity, and ease of troubleshooting performance issues?

A) Central inverter with data acquisition system located at the inverter.
B) Multiple-string inverter system with monitored dc-to-dc converters located at each module
C) Multiple-string inverter system with data acquisition system located at each dc combiner
D) Multiple-string inverter system with data acquisition system located at each inverter.

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

Solutions: