Home / Standards / GB 20052-2013 GB 20052-2013 Abolished Minimum allowable values of energy efficiency and energy efficiency grades for three-phase distribution transformers 三相配电变压器能效限定值及能效等级 Standard Type GB ICS 27.010 CCS F01 Status 废止 Issue Date 2013-06-09 Implementation 2013-10-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委