What characterizes a "zinc-coated" fitting?

A fitting characterized as "zinc-coated" is treated specifically to resist corrosion. The zinc coating acts as a protective barrier that prevents rusting and deterioration of the underlying metal, enhancing the longevity and durability of the fitting in various environments, especially those exposed to moisture or harsh conditions. This characteristic is crucial in electrical installations because it helps maintain system integrity and safety by reducing the risk of failures due to corrosion.

The other options address features that are not inherent to zinc-coated fittings. For instance, while a bright finish may be aesthetically pleasing, it does not define the functional purpose of a zinc coating, which is primarily geared towards corrosion resistance. Similarly, the conductivity of the fitting is not improved merely by the presence of a zinc coating; rather, the focus is on protection. Furthermore, the weight of the fitting is not necessarily influenced by the zinc coating, as the primary function of the coating is to enhance durability rather than alter the physical characteristics like weight.