GE Industrial Solutions ProTrip Conversion Kits AK-1-15 and AK-1-25 - Manual (Page 14)

15
3. Verify that the wiring harness connections to the
sensors have the proper polarity (white lead to
common, black lead to tap), as shown in the
cabling diagram in Figure 18.
4. On ground fault breakers serving four-wire loads,
check that the neutral sensor is properly con-
nected, as indicated in Figure 18. In particular,
check the following:
a. Verify that the neutral sensor has the same rat-
ing and tap setting as the phase sensors.
b. Verify continuity between the neutral sensor
and its equipment-mounted secondary discon-
nect block. Also check for continuity from the
breaker-mounted neutral secondary disconnect
block through to the trip unit wiring harness
connector.
c. If the breaker’s lower studs connect to the
power source, then the neutral sensor must
have its load end connected to the source.
d. Verify that the neutral conductor is carrying
only the neutral current associated with the
breaker’s load current (the neutral is not shared
with other loads).
5. If the preceding steps fail to identify the problem,
then measure the sensor resistances. The appro-
priate values are listed in Table 1. Since the phase
and neutral sensors are electrically identical, their
resistances should agree closely.
Breaker CT Rating, A Resistance, ohms
AK-1-15
150
225
9–12
14–18
AK-1-25
225
600
14–18
40–50
Table 1. CT resistance values.