What does 'locking' an electrical panel prevent?

Locking an electrical panel is a crucial safety measure that primarily serves to prevent accidental re-energization. This means that if maintenance or repair work is being done on the electrical system, locking the panel ensures that it cannot be inadvertently powered back on by an unauthorized person or due to a mechanical fault. This action protects technicians and service personnel from potential electric shock and other hazards associated with an unexpected return of power while they are working.

While other issues such as electrical surges, overheating, and short circuits are important considerations in an electrical system's safety and functionality, locking the panel is specifically about controlling access to power. By preventing unauthorized access and ensuring that only trained personnel can operate the panel, the risk of accidents is significantly reduced.