Pad-mounted transformers (big green boxes) change voltage from higher levels to voltages people use in homes. High-voltage electricity flows through transformers (inside the casing), which is why Rock Energy Cooperative wants to remind its members that a safe distance away from them should always be maintained. In addition, members should keep a clear path to transformer boxes on their property in case co-op employees need to access them.

While overhead power lines are mounted on utility poles and substations are protected by security fences, pad-mounted transformers, switch boxes and pedestals are at ground level.
In many newer subdivisions and residential developments, overhead lines are no longer an option. Burying power lines also reduces potential system damage from high winds and severe storms. While members might not often see technicians working on the transformers, they are regularly inspected by co-op crews riding through neighborhoods.
It’s important to not landscape near co-op equipment, so workers can safely make repairs when needed. Co-op technicians need at least 10-feet clearance at the opening side of a pad-mounted transformer. Approximately 4 feet of open space is preferable at the rear and on the sides of the metal housing. We also encourage public works and transportation departments to keep their equipment, supplies and road debris at least 15 feet away from pad-mounted transformers.
That distance allows for tool use, including 8-foot-long hot sticks used to work with energized equipment. It also ensures that one or two technicians working on a transformer have space to maneuver should they have to back away if problems occur.
Pad-mounted transformers are connected to primary high-voltage lines, and secondary lines can extend in several directions to distribute power to homes and businesses. That’s why it’s important to call 8-1-1 before planting shrubs or trees, setting fence posts, installing sprinkler systems and digging where it might damage underground lines. You should call 8-1-1 at least two full business days before you dig for a site assessment and marking before proceeding with projects that might disrupt utility service.