Interpretation of the “Five Mandatory Surveys” for On - site Investigation in the Operation and Maintenance Specialty

The power outage and work scopes must be clearly inspected

Collaborate with the site survey leader to confirm the equipment to be maintained and the work area involved. Consider requirements such as the use of special vehicles and large machinery, and safe distances from adjacent energized equipment. Verify on-site whether the proposed power outage scope is sufficient to meet the operational needs.

On-site safety measures must be clearly inspected

Collaborate with the site survey leader to verify switches and disconnectors to be opened, locations and number of grounding points, circuit breakers to be pulled, fuses to be removed, and pressure plates to be withdrawn. Confirm the scope and method of on-site fencing (barriers, red curtains), access points of the work area, warning signs to be posted, and ladders for access.

Energized sections and adjacent operating equipment to be retained must be clearly inspected

Collaborate with the site survey leader to verify energized sections retained at the work site, adjacent primary equipment, energized conductors crossing above the maintenance area, and operating lines and conductors that may induce hazardous voltages during tasks such as line parameter testing. Also verify secondary operating equipment, control handles, pressure plates, and circuit breakers in the same panel (cabinet), operating cables laid in the same trench, and jointly inspect secondary terminals of operating circuits, and associated protection circuits such as bus differential and failure protection with secondary maintenance and protection specialists.

Working conditions for special operation vehicles must be clearly inspected

Collaborate with the site survey leader to inspect travel routes, working positions, working boundaries, and transfer routes for special operation vehicles.