What size schedule 40 rigid PVC is required for a 10/2 NM cable containing two cables?

To determine the size of schedule 40 rigid PVC required for a 10/2 NM cable containing two individual conductors, it's essential to consider the National Electrical Code (NEC) guidelines regarding conduit fill.

The NEC specifies that the maximum fill for a conduit is based on the total cross-sectional area of the conductors inside. For non-metallic sheathed cable like 10/2 NM, which contains two conductors and a ground, you need to account for the overall size of the cable when calculating conduit fill.

A 10/2 NM cable with ground has a specific outer diameter, leading to a certain fill requirement when placed into conduit. According to the NEC, when two of these NM cables are placed together, they will require a larger conduit to ensure compliance with fill capacity regulations and to facilitate proper installation.

The calculation shows that a 1-inch rigid PVC conduit does not provide enough space for two 10/2 cables. A 1 1/2 inch PVC conduit offers sufficient space, but to meet the code requirements while allowing for ease of installation and future maintenance, 1 1/4 inches is appropriate for this scenario. This size allows for safe and efficient running of the cables without exceeding the maximum fill capacity