Which type of fittings and enclosures are permitted to be used with IMC?

Intermediate Metal Conduit (IMC) is a type of rigid conduit that is commonly used for electrical installations. The key feature of IMC is its durability and lightweight nature while still providing a strong protective cover for electrical wiring.

When it comes to fittings and enclosures used in conjunction with IMC, both steel and aluminum options are permissible. Steel fittings are often preferred in many applications due to their robust strength and resistance to impact, making them ideal for environments that may experience physical stress. On the other hand, aluminum fittings are also allowed, providing a lighter option that still offers good corrosion resistance, particularly in more challenging environments.

The allowance for both materials means that the installer can choose fittings and enclosures based on the specific requirements of the job, such as environmental conditions or weight considerations. This versatility is beneficial as it allows for flexibility in electrical installations.

Thus, the correct answer encompasses both materials—highlighting the broad compatibility of IMC with various types of fittings and enclosures, ensuring that the right choices can be made to suit different installation needs.