To make a 90° bend in RMC, the conduit must be bent to what degree to account for spring-back?

When bending Rigid Metal Conduit (RMC), it is important to account for a phenomenon known as spring-back. This is the slight straightening that occurs in the conduit immediately after it is bent. To achieve a precise 90-degree bend, the bend must be made to a slightly larger degree than 90 degrees to compensate for this spring-back.

The correct answer indicates that a bend should be made to 95 degrees. This additional five degrees allows for the natural tendency of the conduit to spring back toward its original shape after the bending force is removed. As a result, when the bend is released, it settles at the desired 90-degree angle, taking into account the elasticity of the material.

This understanding is vital for achieving accurate installations in electrical wiring and other applications where precise angles are critical, ensuring both functionality and safety in installations.