Is the armor of listed Type AC or Type MC cable typically required to qualify as an equipment grounding conductor?

The armor of listed Type AC (Alternating Current) or Type MC (Metal-Clad) cable serves as an equipment grounding conductor. This is crucial for safety because it ensures that any fault current is safely directed to the ground, minimizing the risk of electrical shock or fire.

Type AC cable has a metallic sheath that provides strength and serves as a grounding means, while Type MC cable provides similar features but typically includes additional layers for moisture protection and flexibility. For both cable types, the metallic armor can fulfill the function of grounding by providing a path for fault current under abnormal conditions.

In certain installations and depending on local codes, the armor must be properly connected to ground to effectively serve its purpose, and this is often a requirement in the National Electrical Code (NEC). This connection aids in maintaining an effective ground-fault current path, enhancing the overall safety of the electrical system.

Understanding this function is essential for professionals in the electrical field, ensuring compliance with safety standards and a well-grounded electrical system.