What kind of armor does Type AC cable have?

Type AC cable is designed with flexible metal tape armor. This feature provides both mechanical protection and a grounding path, which is essential for safety in electrical installations. The flexible metal tape allows the cable to maintain a degree of flexibility, making it easier to route and install in various environments while still safeguarding the conductors from physical damage. This type of armor is particularly beneficial in settings where the cable might be subjected to movement or bending, as it can absorb some of the stresses without compromising the integrity of the cable.

In contrast, the other options do not apply to Type AC cable. Plastic armor would lack the necessary durability and grounding capabilities that metal provides. A solid metal casing would be too rigid, restricting flexibility and adaptability in installation scenarios. Composite materials, while they may provide some benefits, are typically not used for the armor in Type AC cables, which are specifically designed with flexible metal tape for optimal performance and safety.