What is a common requirement for running conduit exposed to potential physical damage?

When conduit is exposed to potential physical damage, a common requirement is that the conduit must be rigid. Rigid conduit offers enhanced protection against impacts and is designed to withstand the harsher conditions that may exist in environments where physical damage is a possibility. The sturdiness of rigid conduit ensures that the electrical wiring within is safeguarded against external forces, thus maintaining the integrity and safety of the electrical system.

Other types of conduit, while useful in certain applications, do not provide the same level of protection when it comes to physical threats. For instance, flexible conduit is intended for applications where movement or vibrations are a consideration, but it does not offer the same impact resistance as rigid conduit. Similarly, while painting conduit may help with aesthetics or corrosion resistance, it is not a primary requirement for ensuring protection against physical damage. Lastly, certain types of conduit, such as EMT (Electrical Metallic Tubing), may also be permitted, but in scenarios where heavy impacts are a concern, the use of rigid material is generally mandated to guarantee safety and compliance with applicable codes or standards.