Electrician's Licensing Practice Exam

The use of M/C (metal-clad) cable in a cupboard environment is primarily to guard the wire against damage. M/C cable is constructed with a metal sheath that provides a robust physical barrier, protecting the conductors within from physical impacts, abrasion, and other potential hazards that may be present in a cupboard setting, such as sharp edges or other equipment that may inadvertently come into contact with the wiring. This level of protection is especially important in areas where the risk of mechanical injury to the cable is higher.

In comparison, while Romex (non-metallic sheathed cable) is versatile and widely used for residential wiring, it lacks the protective metal sheath that M/C cable offers. As a result, Romex may be more susceptible to damage in environments where physical protection is necessary. This distinction highlights the importance of using the correct type of cable based on the potential risks of a particular installation site, ensuring safety and compliance with electrical codes.