The transformer must work in parts with relative humidity under 95% to prevent insulation degradation. Puchaced a reconditioned three phase 30KVA 480^ - 208/120Y dry type general X-former for an affordable price. Shipping was speedy and packaging was tight with each of the KO punched up to now sealed up. https://go.bubbl.us/e9a4fe/b2cf?/transformers