When grounding small wind electric systems, what is the minimum size equipment grounding conductor required to ground the guy wires that support the turbine tower?

A. 6 AWG

B. 2/0 AWG

C. 4/0 AWG

D. Not applicable, as no system grounding conductor is required

Answer: D

As noted in 694.40(B), "Guy wires used to support turbine towers shall not be required to be connected to an equipment grounding conductor or to comply with the requirement of 250.110."

An Informational Note that follows states, "Guy wires supporting towers that are adequately grounded are unlikely to become energized. Grounding of metallic guy wires may be required by lightning codes. See 694.40(C)(4)."

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.