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One of the most critical decision when designing stable and safe electrical systems is system grounding. The key parameter that determines the neutral grounding resistor’s affect on the circuit is the let-through current. This video will focus on how to determine what level of let-through current to specify when designing a resistance-grounded system.
Variable-Frequency drives create a blind spot to low-level ground faults in high-resistance grounded systems. This paper explains why using VFDs in high-resistance grounding systems can be problematic, and provides an in-depth discussion of how they can be overcome.