What are the containment requirements for a pad-mounted transformer oil containment system?

In a pad-mounted transformer oil containment system, the requirements generally include having an impermeable containment structure designed to capture and prevent oil spills or leaks from the transformer. The containment area must be sized appropriately to accommodate the total volume of oil contained in the transformer, typically calculated based on the maximum potential spill volume, which is often 110% of the transformer oil capacity. Additionally, materials used for containment must be resistant to oil degradation, ensuring durability and effectiveness over time. The containment system should be equipped with drainage options that comply with local regulations, and regular inspections should be scheduled to assess the integrity of the containment and to ensure that it remains free from leaks. Proper documentation and periodic reporting of any maintenance actions are also essential for regulatory compliance and environmental protection.