What is the maximum cross-sectional area of a ferrous metal raceway that can accommodate a single grounding electrode conductor?

The maximum cross-sectional area of a ferrous metal raceway that can accommodate a single grounding electrode conductor is specified as 53%. This specification is rooted in the need to ensure that the grounding conductor has adequate space within the raceway for proper installation and performance. The 53% rule ensures that enough room is available for the grounding electrode conductor to be installed without compromising its effectiveness and reducing the risk of overheating due to overcrowding. This guideline is derived from electrical codes that govern the installation of grounding conductors to ensure safety and reliability in electrical systems.

Utilizing the specified percentage helps maintain a balance between sufficient space for the grounding conductor and overall conduit volume, which is critical for effective grounding and bonding practices in electrical installations.