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线管 GY305-20什么意思

2025-03-15 04:07:13

推荐回答（1个）

回答1：

3为特性代号，机械性能属中型；05为主参数代号，温度等级5型05。你可以参阅JG3050-1998建筑用绝缘电工套管及配件 - 行业标准。
305是管子的型号，厚度，平常我们这里说205是轻型管 305是中型管 405是重型管。看你用在哪里吧，自己包工包料的话，砖墙结构直管就用205的，过梁预制板就用305的，混凝土框架就用405的。

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