What is the largest conductor permitted in a 3/8" flexible conduit?

The largest conductor permitted in a 3/8" flexible conduit is indeed 10 AWG. This is derived from the NEC (National Electrical Code) requirements that set standards for conductor sizes based on the type and size of the conduit used.

Flexible conduits have specific fill capacities, meaning there are limitations on how large of a conductor can fit inside without exceeding those limits. In the case of a 3/8" flexible conduit, it is specified that 10 AWG is the largest gauge that can be installed without violating these fill requirements. Choosing a conductor larger than 10 AWG could lead to issues such as overheating, diminished performance, or safety hazards.

Understanding conduit fill is essential for ensuring safe and efficient installation of electrical wiring. The NEC provides guidelines and tables to help electricians determine the appropriate conductor sizes for different types of conduits, ensuring compliance with safety standards and considerations for conductors' physical placement within conduits.