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NFW-50X Manual —
P/N LS10129-001NF-E:C 7/25/2018
Appendix H: Open/Short/Ground Trip Values
Table H.1 lists the earth fault resistance detection for each applicable terminal on the FACP.
Table H.2 lists the open/short trip values and restoral values for the NAC circuits on the FACP.
Output Circuit
Terminal
Trip Resistance (in ohms)
Remote Sync
+
360K
Remote Sync
-
330K
NAC 1-2
+
360K
NAC 1-2
-
320K
ANN Bus
A
270K
ANN Bus
B
265K
Aux Power
+
370K
Aux Power
-
320K
SLC
+
125K
SLC
-
320K
Table H.1 Earth Fault Trip Values
Circuit
Trip Resistance (in ohms)
Restore Value
NAC 1-2
Shorts below 1.75K
2K
NAC 1-2
Opens above 25K
23K
Table H.2 NAC Open/Short Trip Values