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I want to thank everyone for their helpful posts. In response to che12345, in mining applications the ground fault trip for each branch circuit must be instantaneous. A ground fault condition is considered an emergency, and the power must be removed to prevent shock and/or electrocution. The...

thread248-481670 In the United States, in underground mining applications it is legally required that the source secondary transformer have a neutral point, and the neutral must be grounded through a resistor. The resistor value is chosen to limit the maximum phase to ground fault current to 15...