When are CHANCE H-rated grounding components manufactured to ASTM F855 Table 2 required to be used for temporary protective grounding?

If the asymmetry of the maximum available fault current exceeds 20% asymmetry factor (X/R > 1.8) then Table 2 H-rated temporary protective grounding components should be used.  If the level of asymmetry of your system is unknown, please contact your qualified system engineer.  Typical high X/R situations include locations in and near substations, generation, and high load areas.



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