What is the standard NPT taper per foot required for the threads of a piece of conduit?

The standard NPT (National Pipe Taper) is designed to create a tight seal when two threaded components are joined together. For NPT threads, the standard taper is 3/4 inch per foot. This taper allows for a gradual tightening of the connection as the threads are turned together, promoting a secure fit that can withstand pressure without leaking.

The values for the taper per foot are specific and standardized in industry practices. While other taper measurements exist, they apply to different types of threads or applications, making it essential to use the correct specifications for installations involving conduit and other piping systems. Understanding the correct taper is important for ensuring compliance with electrical codes and achieving optimal performance in raceway installations.