Final answer:
Accessories like lockouts, bushings, and similar components in wiring systems are mechanical parts that ensure safety and structural integrity in electrical engineering.
Step-by-step explanation:
An accessory such as a lockout, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function, falls into the category of mechanical components in electrical engineering. These are usually safety or structural elements that do not directly contribute to the electrical circuit's function but are essential for the physical integrity and safety of the system. A lockout device, for instance, secures a switch or a breaker to prevent it from being turned on and eliminating the risk of electrical current flowing during maintenance.