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圓板 d=d′；
A--水平接地體的形狀系數(shù)A值可采用表9-1所列數(shù)值；
n--垂直接地體的數(shù)量；
nc--垂直接地體利用系數(shù)；
np--水平接地體利用系數(shù)；
nc、np--數(shù)值可采用以下附表9.2、附表9.3和附表9.4所列數(shù)值。
附表9.1
附表9.2 直列式接地裝置的利用系數(shù)表
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