The Quad Plus Breaker Lab received an inquiry from a large municipality with a very unique problem. They informed our Shop Manager that their breakers would not trip due to a lack of maintenance and previous exposure to 2 or 3 inches of water.
A total of (52) 15HK500 breakers, weighing approximately 1500 pounds each, were malfunctioning. Our Shop Manager discovered that the breaker mechanism frames were rusted and the bearings were seized. Therefore, all 52 breakers would have to be removed and evaluated for repair or replacement. To complicate matters, the breakers were located across three underground levels, with 26 on the first level and 26 on the third level.
To access the breakers, a concrete access slab would have to be removed, the breakers hoisted up level by level for repair, and then the access slab would need to be re-sealed. To replace the repaired breakers, the process would have to be repeated, including the breaking and re-sealing of the access slab. The municipality had concerns over the cost and complication of breaking the concrete slab to remove the breakers.