Connecting devices - electrical copper conductors - safety requirements for screw - type and screwless - type clamping units - part 2 : particular requirements for clamping units for conductors above 35 mm2 up to 300 mm2 included 连接器件.电气铜导体.有螺纹和无螺纹线夹部件的安全要求.第2部分:导体截面大于35mm小于等于300mm的线夹部件的特殊要求