What type of conduit must be installed in exposed areas up to 7' 0" above the finished floor?

In exposed areas up to 7 feet above the finished floor, the installation of rigid steel or aluminum conduit is mandated due to its strength, durability, and ability to provide protection for the conductors within against physical damage. This height is significant because it is within reach in many environments, increasing the likelihood of an accidental impact. Rigid conduit provides the necessary mechanical protection that is often required in these situations, particularly in commercial and industrial settings where objects might be frequently moved and the risk of damage to the electrical wiring is higher.

Rigid steel or aluminum conduit also offers advantages such as corrosion resistance (in the case of aluminum) and grounding capabilities (in the case of steel), making it well-suited for various environments. Other types of conduit, such as PVC or non-metallic options, may not provide the same level of protection required at this height, as they may be more susceptible to damage from physical forces or environmental conditions.