Which of the following is NOT a basic component of a switch or receptacle?

A lock spring is not considered a basic component of a switch or receptacle. The basic components typically include terminal screws, contact points, and a faceplate.

Terminal screws are essential for making the electrical connections to the switch or receptacle, providing the interface for the wires that supply power. Contact points are responsible for completing or interrupting the electrical circuit when the switch is turned on or off. The faceplate serves not only an aesthetic function by covering the internal components but also offers protection and safety for the user.

In contrast, while a lock spring may be used in some designs for specific locking mechanisms or features, it is not a fundamental part necessary for the basic operation of most switches or receptacles. Therefore, recognizing the essential roles of the terminal screw, contact point, and faceplate helps clarify why the lock spring is excluded from being categorized as a basic component.