On December 2-3, 2019, China Electric Power Research Institute (CEPRI) organized relevant units and personnel for on-site inspection of its 12kVring main unit (box) standardized prototype at Anhui Longbo Electrical Co., Ltd.. Units participating in the on-site inspection of Anhui Longbo Electrical Co., Ltd. and Hubei Wang'an Technology Co., Ltd. include CEPRI, EETI (National Electrical Product Quality Supervision and Inspection Center), and Anhui Power Huangshan Power Supply Co., Ltd. and State Grid Hubei Electric Power Company.

The inspectors conducted the on-site inspection of standardized ring main unit (box) now produced by Anhui Longbo Electrical Co., Ltd. and Hubei Wang'an Technology Co., Ltd. according to the requirements of 12kV Ring Main Unit (Box) Standardized Design Custom Solutions, and formed an on-site inspection report.

Previously, the inspectors have completed the on-site inspection of 6 standardized handcart switch cabinets produced by Anhui Longbo Electrical Co., Ltd.

At present, EETI has completed the on-site inspection of the 12kVring main unit (box) standardized prototypes of Beijing Hezong Science & Technology Co., Ltd., Jiangsu Daye Intelligent Electric Co. Ltd., and Henan Senyuan Electric Co.,Ltd.