Check the connection of the main earthing bar to the earthing rail of the Powerbloc.
检查主接地排和接地排是否可靠连接；
Down -conductor system connection should be welded, and the conclusion of common earthing system and adoption single earthing has been drawn.
引下线的连接应焊接，采用共用地网和一点接地方式接地等结论。
Equipotential connection may not connect with the manual or natural earthing to become earth-free equipotential connection.
等电位联结也可不与人工或自然接地体连接的，成为不接地的等电位联结。
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