If a disconnecting means is required to be lockable, what must remain in place?

When a disconnecting means is required to be lockable, it is essential that the lock installed remains in place to ensure that the disconnect can only be operated by authorized personnel. This feature serves multiple purposes, including providing a means to prevent accidental or unauthorized operation of the equipment and ensuring safety during maintenance and servicing activities.

The lock allows for a secure method of isolating electrical circuits and equipment, enabling workers to perform their tasks safely without the risk of re-energization. This is a critical safety requirement outlined in the National Electrical Code, helping to protect not only the safety of individuals working on or near the electrical equipment but also to ensure compliance with safety regulations.

In contrast, while the cover plate, handle mechanism, and warning labels are important components of electrical equipment, they do not have the same function of providing a means of locking the disconnecting means. Therefore, keeping the lock installed is the key requirement for maintaining both safety and operational integrity in such scenarios.