Home / Standards / GB 5441.9-85 GB 5441.9-85 Test methods for communication cables — Test for ideal screening factor under power frequency conditions 通信电缆试验方法 工频条件下理想屏蔽系数试验 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A