Do Not Connect to These Systems
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208 V AC 3Ø Wye, ungrounded
Floating Neutral
Voltage of either line to ground is undetermined
Neutral is not grounded
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120/240 V AC 3Ø Delta, corner-grounded
Voltage of any line is not 120 V nominal relative to ground
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Any system where the center point of the AC power source is not grounded.
21
Grounding Requirements
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