NABCEP Small Wind Installer 3

Question 1

Per NEC Article 694, what type of disconnecting means is required for utility-interactive small wind systems?

Accepted Answer

An accessible, load-break rated disconnecting means that utility personnel can operate

Answer

A locked disconnect accessible only to the certified installer

Answer

A circuit breaker located exclusively inside the main service panel

Answer

A fused knife switch rated for DC current only

Question 2

For a small wind system installed on a one- or two-family dwelling, what is the maximum system voltage permitted under NEC Article 694?

Accepted Answer

600 volts

Answer

300 volts

Answer

1,000 volts

Answer

1,500 volts

Question 3

What grounding requirement applies to metal towers used for small wind turbines?

Accepted Answer

Towers must be connected to the system equipment grounding conductor

Answer

Towers must be bonded to the turbine DC negative terminal only

Answer

Towers require separate lightning rod protection but no equipment grounding

Answer

Grounding is optional when the tower is installed on a non-conductive foundation

Question 4

Before performing maintenance on a small wind turbine at the top of a tower, what is the FIRST required safety action?

Accepted Answer

Perform lockout/tagout to isolate and de-energize the turbine electrical system

Answer

Notify the local utility company of the planned work

Answer

Check wind speed and forecast to ensure safe climb conditions

Answer

Don personal fall arrest equipment and inspect the harness

Question 5

What document does a utility typically require before allowing a customer-owned small wind system to connect to the grid?

Accepted Answer

An executed interconnection agreement

Answer

A copy of the installer's NABCEP certification

Answer

A signed insurance waiver from the property owner

Answer

An OSHA-compliant job hazard analysis

Question 6

A small wind turbine produces three-phase AC output at variable frequency. What conversion process makes this output compatible with the utility grid?

Accepted Answer

The variable AC is rectified to DC, then inverted to 60 Hz AC by a grid-tie inverter

Answer

A step-up transformer directly converts the variable frequency to grid frequency

Answer

A synchronous condenser synchronizes the turbine output to grid frequency

Answer

A battery charge controller regulates the output before grid connection

Question 7

Which of the following best defines 'capacity factor' as applied to a small wind turbine?

Accepted Answer

The ratio of actual annual energy produced to the theoretical maximum energy if the turbine operated at rated power continuously

Answer

The maximum wind speed at which the turbine can safely generate power

Answer

The percentage of calendar time the turbine is mechanically available to operate

Answer

The ratio of turbine rotor diameter to hub height