ECONOMICS OF HIGH RESISTANCE GROUNDING case study Any electrical system has the same preferred deliverables – process continuity, free from electrical hazards and no equipment damage. The decision on which grounding option to choose for the electrical system in an industrial facility is simple – ungrounded, solidly grounded or resistance grounded. The most common option in North America for 480V and 600V distribution is solidly grounded despite the concern over interrupting processes during a ground fault and the unintended consequence of the arc flash hazard. In the IEEE 141-1993, recommended Practice for Electrical Power Distribution for Industrial Plants section 7.2.4, it states that, “The solidly grounded system has the highest probability of escalating into a phase-to-phase.

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