In most applications, IMC and what other conduit type are considered interchangeable?

Intermediate Metal Conduit (IMC) is commonly considered interchangeable with rigid conduit due to their similar applications and structural properties. Both types of conduit are designed to protect electrical wiring, providing a durable, weather-resistant enclosure that can withstand physical damage and environmental factors.

IMC is lighter than rigid conduit, making it easier to handle and install, yet still maintains strength and rigidity to meet various installation requirements. They are both non-flexible conduits, so they are suitable for applications where movement or vibration is minimal.

While other conduit types, such as PVC or EMT, have their specific uses and advantages, they are not considered interchangeable with IMC in most cases. PVC, for example, is more suitable for underground installations and in areas where moisture or corrosive environments are a concern, while EMT is typically used for indoors, providing less protection against physical damage compared to IMC or rigid conduit.