Mechanical interlocking should be used in combination with electrical methods so that the locked coil cannot be energized. This statement is:

Mechanical interlocking is an important safety feature in motor control systems. It ensures that specific devices, such as contactors or relays, cannot be operated simultaneously when it is unsafe to do so. The purpose of using mechanical interlocking in combination with electrical methods is to create a fail-safe mechanism where, even if there is a fault in the electrical control circuit, the mechanical interlock prevents the locked coil from being energized. This design helps to avoid potential hazards, such as short circuits or equipment damage.

In scenarios where multiple control devices are involved, relying solely on electrical methods may not provide the necessary level of safety. Mechanical interlocking adds an additional layer of protection by physically preventing the operation of certain components until it is safe to engage them. This integration of electrical and mechanical security measures is crucial for ensuring the safe operation of motor control systems across various applications, whether in high voltage or low power systems.