What outer layer is indicated by 'MC'?

The designation 'MC' refers to "Metal Clad," which is a type of electrical cable that features a metal sheath or outer layer. This metal cladding provides several important benefits. It enhances the mechanical protection of the conductors inside the cable, making it more resistant to damage and reducing the risk of electrical hazards. Additionally, the metal outer layer can shield the conductors from electromagnetic interference, which is critical in maintaining the integrity and performance of electrical systems, particularly in environments with significant electromagnetic noise.

Metal clad cables are commonly used in commercial and industrial applications because they offer durability and safety advantages over other types of insulation and shielding methods. The presence of a metal layer also contributes to the cable's overall fire resistance and can improve its ability to withstand environmental factors such as moisture or pest intrusion, depending on the specific design and materials used.

The other options refer to characteristics or functions that do not align with the "MC" designation, as they pertain to different aspects unrelated to the electrical protection provided by metal cladding.