When the cover board and door are opened for them entry into other parts of switchboard, the main bus and bus connection should not be exposed.
当盖板和门为进入配电盘其它部分而打开时，不应暴露主要母线和母线连接。
When the cover board and door are opened for them entry into other parts of switchboard, the main bus and bus connection should not be exposed.
当盖板和门为进入配电盘其它部分而打开时，不应暴露主要母线和母线连接。
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