What is the maximum number of 10 AWG THWN-2 conductors allowed in a 1-inch Electrical Nonmetallic Tubing?

The maximum number of 10 AWG THWN-2 conductors allowed in a 1-inch Electrical Nonmetallic Tubing (ENT) is determined by the National Electrical Code (NEC) and is based on the fill capacity of the conduit. For conductors of a specific gauge, the NEC provides tables that outline the allowable fill for different types and sizes of raceways.

In the case of 10 AWG THWN-2 conductors, it is important to consider that THWN-2 is a type of wire that is rated for wet locations and is commonly used for residential and commercial wiring. The NEC specifies that the fill capacity calculations need to account for the cross-sectional area of the conductors as well as the total area of the conduit.

For 1-inch ENT, the NEC allows a certain number of conductors based on their size. According to the NEC Table for conductor fill, in the case of 10 AWG THWN-2 conductors, the maximum number that can fit in a 1-inch diameter tube is indeed 23. This figure is critical for ensuring safety, preventing overheating, and ensuring proper voltage drop within the wiring system.

Understanding these calculations and fill limitations ensures compliance with electrical codes and enhances the