Why is mechanical interlocking recommended to be used in combination with electrical methods?

Mechanical interlocking is recommended to be used in combination with electrical methods primarily to ensure that specific conditions are met before certain actions are taken, especially in the context of power systems and motor control. The correct rationale for this practice is that it prevents the locked coil from being energized. This means that when certain devices or systems are in a locked state—indicating they should not operate due to safety or operational protocols—the mechanical interlock ensures that the electrical circuit cannot energize those coils.

By utilizing mechanical interlocks alongside electrical controls, the system improves safety by physically preventing energization of the equipment in potentially dangerous situations. This approach mitigates the risk of accidental starts or malfunctions that could lead to hazardous conditions for both equipment and personnel.

In other contexts, such as maintenance, while safety is always a concern, the locking mechanisms specifically focus on preventing unintended operations rather than merely ensuring safety during maintenance or reducing mechanical wear. Similarly, the goals of increased control precision and wear minimization don't directly relate to the primary function of mechanical interlocks. Therefore, the relationship between preventing the locked coil's energization and safety is central to understanding the role of mechanical interlocking in motor control systems.