When field threading conduit, what taper is required?

The required taper for field threading conduit is 1 in 16, or 3/4" per foot. This taper ensures that the threads created on the conduit are properly aligned and provide an adequate seal when joining pipes and fittings. A 1 in 16 taper strikes a balance between strength and ease of threading, allowing for the creation of threads that are both robust and compatible with standard fittings.

In practice, this specific taper facilitates a proper fit, which is critical for maintaining the electrical integrity and mechanical strength of the conduit system. Utilizing the correct taper helps minimize the risk of cross-threading or misalignment, which can lead to leaks or electrical faults.

The other tapers provided in the other choices either create threads that are too steep or too shallow for effective use in electrical conduit threading, impacting the overall performance and safety of the installation.