Who should have access to electric vaults and substations?

• A. General public
• B. Authorized personnel only
• C. Maintenance contractors only
• D. Utility customers

Answer: (B)

Access to electric vaults and substations must be restricted to authorized personnel who are trained and equipped to work around high-voltage equipment. These facilities contain energized circuits, switchgear, transformers, and control systems where a mistake or even an incidental touch can cause severe injuries or arc flash, potentially leading to life-threatening outcomes. Because of the safety risks and the need to protect the integrity of the electrical system, access is tightly controlled and documented, with proper approvals and procedures in place. Maintenance contractors may enter only when they have explicit authorization and are following required safety protocols, such as lockout/tagout and being escorted if needed. Utility customers do not automatically have access and should rely on utility staff for service needs. If you see an unsecured area or untrained personnel near vaults or substations, report it and avoid contact.