The roots of the arc must not be allowed to come into contact with insulator surface, whereas the middle of the arc channel can do so.
电弧弧根不应接触绝缘子表面，但允许电弧通道的中间部分可以擦过绝缘子。
The roots of the arc must not be allowed to come into contact with insulator surface, whereas the middle of the arc channel can do so.
电弧弧根不应接触绝缘子表面，但允许电弧通道的中间部分可以擦过绝缘子。
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