What is the requirement when a clearance order is issued to ensure complete isolation of all electrical apparatus?

When a clearance order is issued, placing a hold card on any switch is crucial for ensuring that all electrical apparatus remains completely isolated. The hold card serves as a clear indication that the equipment is not to be operated or engaged with until the clearance is removed. This is an important safety protocol that helps to prevent accidental re-energization or operation while work is being performed on electrical systems. It communicates to all personnel that the equipment is off-limits, thereby maintaining a safe working environment.

In contrast, while erecting a safety barrier and tagging equipment are also measures that can contribute to safety, they do not serve the specific purpose of preventing electrical engagement as effectively as a hold card does. Safety barriers may restrict access but do not indicate the status of electrical systems. Tagging the equipment alerts personnel to the fact that the equipment is being serviced, but a hold card on switches provides a more robust protocol by directly preventing operation. Ensuring that all operators exit the area may be part of certain safety protocols, but it does not specifically address the isolation of electrical apparatus in the manner that a hold card does.