Which safety feature prevents unauthorized access to electrical installations?

The correct answer highlights the role of safety locks as a key feature in preventing unauthorized access to electrical installations. Safety locks are designed to restrict access to equipment and control panels, ensuring that only authorized personnel can operate or manipulate electrical systems. By physically securing these areas and mechanisms, safety locks significantly reduce the risk of accidental or intentional tampering, which is crucial for maintaining both operational integrity and safety.

While access control systems are also effective in managing who can enter certain areas, they often rely on electronic solutions or monitoring which may not be present in all scenarios. Warning signs serve to inform individuals of hazards but do not actively prevent access. Fencing, while it can deter unauthorized entry to a broader area, does not provide the specific control needed at the point of access to electrical installations. Safety locks, therefore, provide a direct and effective means of safeguarding critical electrical components.