What outer layer does 'MC' indicate?

'MC' stands for Metal Clad, which refers to a type of cable used in electrical installations. Metal-clad cables are constructed with a durable metal sheath that protects the internal conductors from physical damage and environmental factors. This metal layer also provides a certain level of grounding and shielding, which helps improve safety and performance in various applications, especially in industrial settings.

The use of metal cladding is beneficial because it adds strength and reduces the risk of damage from impact or rodent activity, while also serving as a partial shield against electromagnetic interference. In certain installations, such as those requiring additional protection from moisture or chemicals, metal-clad cables are often specified to ensure integrity and longevity.

In contrast, the other options—like magnetically shielded, multiple conductor, and moisture resistant—do not specifically describe the outer layer denoted by 'MC.' Instead, they refer to other characteristics or types of cables that may not align with the definition or application of metal-clad cables. Understanding these distinctions is crucial for selecting the appropriate type of cable for specific electrical environments and conditions.