Page 225 - Electrical Safety of Low Voltage Systems
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208 Chapter Twelve
FIGURE 12.8 High-voltage ground faults in IT systems with independent
grounds.
insulation rating of the equipment within the substation, which is the
most stressed by the ground faults.
12.3 External Overvoltages
External overvoltages are caused by lightning. Lightning is defined
2
by IEEE Standard 100 as an electrical discharge that occurs in the
atmosphere between clouds or between clouds and ground. In the
FIGURE 12.9 High- and low-voltage ground faults in IT systems with
independent grounds.
