PSI Journeyman Online Practice Exam

The distinction between type AC and type MC cable primarily revolves around their construction and applications. Type MC (Metal Clad) cable features a metal sheath that provides excellent protection and grounding capabilities. This metal sheath is typically made of aluminum or steel and adds durability and resistance to environmental impacts. In contrast, type AC (Armored Cable) utilizes a flexible metal armor made from spiral-wound metal strips, which offers flexibility while still providing some level of protection, but not to the extent that type MC does.

Type MC cable is often preferred in environments where exposure to moisture or physical damage is a concern, making it more suitable for a variety of installations, including both indoor and outdoor. Understanding these differences is crucial for electricians and installers who need to select the appropriate cable type for specific applications.