NABCEP Small Wind Installer 2

Question 1

Which NEC article specifically governs the installation of small wind electric systems?

Accepted Answer

Article 694

Answer

NEC Article 694 covers small wind electric systems, addressing wiring methods, disconnecting means, grounding, and overcurrent protection.

Question 2

At what reference wind speed are small wind turbines typically rated for power output per IEC 61400-2 and AWEA standards?

Accepted Answer

24.6 mph (11 m/s)

Answer

Small wind turbines are rated at a reference wind speed of 11 m/s (approximately 24.6 mph) to provide a standardized basis for comparing turbine performance.

Question 3

What type of generator is most commonly used in small wind turbines?

Accepted Answer

Permanent magnet alternator

Answer

Permanent magnet alternators are preferred in small wind turbines because they operate efficiently at variable speeds and require no external field excitation.

Question 4

Which tower type is generally recommended for ease of maintenance on small wind installations?

Accepted Answer

Tilt-up (hinged) monopole tower

Answer

Tilt-up towers can be lowered to the ground using a gin pole and winch, allowing all maintenance to be performed at ground level without climbing.

Question 5

What is the purpose of a dump load (diversion load) in a battery-based small wind system?

Accepted Answer

To dissipate excess energy when the battery bank is fully charged

Answer

A dump load absorbs surplus energy when batteries reach full state of charge, preventing overvoltage that would damage the battery bank and other components.

NABCEP - North American Board of Certified Energy Practitioners Practice Test

NABCEP - North American Board of Certified Energy Practitioners Practice Test

NABCEP Small Wind Installer 2