标准号:IS 9921 Pt.2-1982
发布日期:1982/9/1 12:00:00
实施日期:1999/12/31 12:00:00
适用范围:This specification applies to alternating current disconnectors and earthing switches, designed for indoor and outdoor installation, for voltages above 1 000 V and for the service frequency of 50 Hz.