Class I Lighting Protection System (LPS) requires a #2 AWG Copper down conductor.

• A. True
• B. False
• C. Not specified
• D. Other gauge

Answer: (A)

In a Class I Lighting Protection System, the down conductor must provide a solid, low-impedance path for lightning current to reach the grounding system. The standard specifies copper down conductors of at least #2 AWG for Class I, meaning the minimum size you must use is #2 AWG. This size offers enough cross-sectional area to carry the surge and limit temperature rise and voltage on the conductor, while ensuring reliable bonding to the grounding system and compatibility with common fittings. Heavier gauges will still meet the requirement, but using any smaller conductor would not. So, the statement is correct because #2 AWG copper is the required minimum for the down conductor in Class I LPS.