What size Schedule 40 Rigid PVC is required for two 10/2 NM cables with specified dimensions?

To determine the appropriate size of Schedule 40 Rigid PVC for two 10/2 NM (non-metallic) cables, it is essential to consider the internal diameter of the PVC conduit and the fill capacity allowed for conductors within that conduit.

The National Electrical Code (NEC) provides guidelines on conduit fill that dictate the maximum number of conductors permitted in different sizes of conduits. For two 10/2 NM cables, which typically have a diameter of around 0.5 inches each, the total diameter would be approximately 1 inch. However, additional spacing is necessary for proper heat dissipation and ease of pulling, which increases the required conduit size.

A 1 1/4" Schedule 40 PVC conduit generally offers sufficient internal space to accommodate these two cables while adhering to NEC fill requirements. This size not only provides the necessary extra space for ease of installation but also ensures compliance with safety regulations regarding heat management and conductor handling.

Choosing a smaller diameter conduit might lead to overcrowding, which can result in overheating or damage to the cables, while choosing a significantly larger one may be unnecessarily wasteful and less efficient for electrical installations. Thus, a 1 1/4" size is the most suitable choice for