GB/T 28924-2023 Chinese PDF (GB/T28924-2023) GB/T 14663-2024 TN and IT systems (Chinese:

TN and IT systems (Chinese: 交流1000V和直流1500V及以下低压配电系统电气安全 防护措施的试验、测量或监控设备 第11部分：TT、TN和IT系统中剩余电流监视器（RCM）的有效性)

GB/T 16439-2024_Chinese: General specification for AC servo system (Chinese: 交流伺服系统通用技术规范)

English versions: GB/T 30785-2025

11-2025_Chinese: Safety requirements for electrical equipment for measurement

GB/T 26849-2025_Chinese: Electronic control gear for solar photovoltaic (PV) lighting - Performance specifications (Chinese: 太阳能光伏照明用电子控制装置 性能规范)

GB/T 28924-2023 Chinese PDF (GB/T28924-2023) GB/T 14663-2024 TN and IT systems (Chinese:GB T 28924 2023_Chinese: Guides for calculating energy efficiency index for iron and steel enterprises (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 28924 2023