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CHAPTER 2: INSTALLATION
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
ground fault alarm and trip current setpoints are below the maximum ground current that
can flow due to limiting by the system ground resistance. Sensing levels below 20% of the
phase CT primary rating are not recommended for reliable operation.
FIGURE 2–4: Core Balance Ground CT Installation (unshielded cable)
2–23
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