How is thinwall conduit (EMT) sized in residential wiring?

Thinwall conduit, also known as electrical metallic tubing (EMT), is typically sized the same as rigid conduit for the same installation type. This is because both types of conduit are intended to protect electrical wires, offering similar levels of physical and environmental protection. The sizing standards for conduit are primarily based on the internal diameter required to accommodate the number and size of conductors being installed, ensuring compliance with electrical code requirements.

While there are differences in material strength and flexibility between EMT and rigid conduit, the sizing aspect remains consistent when considering equivalent applications. This ensures that both conduit types can sufficiently fulfill their purpose of safeguarding the wiring while adhering to regulatory guidelines for conduit fill and installation practices. Therefore, when comparing installations using EMT and rigid conduit, their sizes are set to be the same to meet these protective requirements effectively.