Startco Engineering Ltd. Page 4
SE-105 Ground-Fault Ground-Check Monitor Rev. 9
Pub. SE-105-M, November 24, 2005.
3.2 GROUND-FAULT CT
Outline and mounting details for CT200 and CT200L
current transformers are shown in Fig. 3. Pass the phase
conductors through the CT window as shown in Fig. 1.
Do not pass the ground or ground-check conductors
through the CT. In applications that require shields or
drain wires to pass through the CT, return them through
the CT before connecting them to ground.
Connect the secondary of the ground-fault CT to
SE-105 terminals CT1 and CT2. The CT connection to
the SE-105 is not polarity sensitive. Ground one side of
the CT secondary.
3.3 G
ROUND-CHECK TERMINATION
Install the ground-check termination at the load to
complete the ground-check loop as shown in Fig. 1.
Termination outlines and mounting details are shown in
Figs. 4 and 5. Connect terminal G of the termination to
the equipment frame so that the ground-conductor-to-
equipment-frame connection will be included in the
monitored ground-check loop. Connect terminal GC of
the termination to the incoming ground-check conductor.
If ground-check interlocks are used, low-level
(bifurcated, precious-metal, or sealed-reed) contacts are
recommended.
If used as a ground-fault monitor only, install the
termination at the SE-105.
3.4 R
EMOTE OPERATION
Terminals SW, CI, +, and GI are provided for remote
LED indication and remote reset as shown in Fig. 1.
Remote LED's are driven in series with the front-panel
LED's.
Remove factory-installed jumpers from terminals CI, +,
and GI, and connect a remote kit as shown in Fig. 1.
Optional remote kits are shown in Figs. 6, 7, and 8.
Standard LED indicator lamps are not compatible with
the SE-105.
For general-purpose applications, use the RK-105
Remote Indication-and-Reset Assembly or the RK-105I
Remote Indication Assembly. Connect terminals SW, CI,
+, and GI to remote-kit terminals SW, CI/RI, +, and GI.
For 22-mm-component RK-102 applications, connect
terminal X2 of the green ground-check indicator to CI,
terminal X2 of the red ground-fault indicator to GI, and
connect indicator X1 terminals to +. For remote reset,
connect the normally open push-button switch across
terminals + and SW.
If indication is required from a separate voltage source,
or if separate ground-fault and ground-check contacts are
required, use an RK-13 Relay Interface Module. The
RK-13 mounts on the SE-105 lower terminal block and is
compatible with the RK-102, RK-105 and RK-105I. See
Figs. 1 and 9. Contact K1 closes when the GC LED is on
and contact K2 closes when the GF LED is on.
3.5 P
ARALLEL-PATH ISOLATION
A PPI-600V can be used for parallel-path rejection. A
PPI-600V will also eliminate intermachine arcing and
prevent stray ac and dc currents from flowing in the
monitored ground wire. See Figs. 10 and 11. See
Technical Information 9.6 “Parallel Path Isolator” at
www.startco.ca, or contact Startco for application details.
3.6 G
ROUND-FAULT TESTING
Use CT-primary current injection to test the ground-
fault circuit. Fig. 12 shows test circuits using the Startco
SE-400 Ground-Fault-Relay Test Unit and the SE-100T
Ground-Fault-Relay Tester. The SE-400 has a
programmable output of 0.5 to 9.9 A for a duration of
0.1 to 9.9 seconds. The SE-100T has LO and HI outputs
for 5- and 15-A resistance-grounded systems.
A test-record form is provided in Section 8 of this
manual. Record the test results and test dates on this form
to meet the requirements of the National Electrical Code
(NEC). Retain the form so that the test data can be made
available to the authority having jurisdiction.
4. COMPATIBILITY
The SE-105 is a direct replacement for the SEL-100,
SEL-100TD, SE-101, SE-101S, SE-102, SE-102S,
SE-102M, SE-103, and SE-103S. Terminal designations
have been changed as shown in Table 1.
Terminals CT1 and CT2 are transformer isolated so
that the CT secondary can be grounded. Units with old
designations do not allow the secondary of the ground-
fault CT to be grounded when the ground-check circuit is
used.
TABLE 1. T
ERMINAL DESIGNATIONS
OLD
DESIGNATION
SE-105
D
ESIGNATION
CT
CT
(RELAY)
(RELAY)
L
N
SW
PL
+
GL
P
G
CT1
CT2
A
B
L1
L2
SW
CI
+
GI
GC
G
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