What is the conduit fill value of #1 RHH conductors in square inches?

The conduit fill value of #1 RHH conductors is recognized as being 0.2660 square inches. This measurement is crucial when determining how many conductors can be effectively placed within a conduit while adhering to the National Electrical Code (NEC) regulations. The fill value helps ensure that the installed conductors have sufficient space for heat dissipation, thereby reducing the risk of overheating.

When installing electrical systems, it is critical to select conductors that correctly fit within the conduit to maintain safety and functionality. The calculations for conduit fill are based on the cross-sectional area of the conductors, which is why understanding the specific fill value for each wire size is key.

Conduit fill values can vary depending on the type of insulation, such as RHH. The correct use of this value in planning helps avoid potential code violations and ensures efficient electrical performance within the system.