GB 20052-2020: Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers Delivery: 9 seconds. Download (and Email) true-PDF + Invoice. Newer version: (Replacing this standard) GB 20052-2024 Get Quotation: Click GB 20052-2020 (Self-service in 1-minute) Newer / historical versions: GB 20052-2024 Preview True-PDF (Reload/Scroll-down if blank)
