接地极对大地的散流电阻，光伏规范典型要求 ≤4Ω（防雷与共用接地 ≤1~10Ω 视标准），实测用三极法。
Spreading resistance of the earthing system; PV codes typically require <=4 ohms (shared lightning earthing 1-10 ohms by standard), measured by 3-point fall-of-potential.
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