High resistance grounding of 600 V power distribution systems is applied in hospitals, data centres and telecom facilities where supply availability is demanded. High resistance grounding provides service continuity during a ground fault. It also enhances electrical safety by preventing a ground fault from escalating into an arc flash incident. However, care must be taken during electrical system design to ensure that transient voltage surge suppressor (TVSS) and uninterruptible power supply (UPS) systems are properly applied. Installation of a TVSS or UPS designed for a solidly grounded system into a high resistance grounded (HRG) system can lead to unintended failures that reduce service continuity.
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