What must all plug-in installations have?

In plug-in installations, having a restraining means is critical to ensure safety and to secure the equipment against movement or disconnection. A restraining means refers to any method or device that prevents the equipment from being accidentally unplugged or moved away from a secure location, which could lead to a hazardous situation. This is especially important in environments where the equipment may be subject to being bumped or moved, ensuring that the power connection remains intact.

While power cords with fuses, grounding wires, and surge protectors provide essential safety mechanisms in various electrical installations, they are not specific requirements mandated for all plug-in installations in the context of restraining means. The primary concern with plug-in equipment installations revolves around preventing accidental disconnections to maintain operations and safety, thereby highlighting the necessity for a restraining means.