What cross-sectional area must a Class I copper main lightning conductor have?

A Class I copper main lightning conductor must have a cross-sectional area of 57,400 circular mils. This specification is established in the guidelines for lightning protection systems to ensure that the conductor can effectively handle the high currents associated with lightning strikes without overheating or sustaining damage. The requirement is based on the effective transfer of energy and safety, providing a reliable path for the lightning current to dissipate into the ground.

The specific measurement of 57,400 circular mils corresponds to 50 square millimeters, which is a standard size that offers a good balance between mechanical strength and electrical conductivity necessary for lightning protection applications. Utilizing conductors that meet this specification is crucial for maintaining the integrity of the lightning protection system and ensuring that it functions as intended.