Effective 10/2004
Page 35I.L. 70C1036H05
testing can determine the accuracy of the desired trip
settings by performing Long Delay, Short Delay, and
Ground Fault functional tests. The Cutler-Hammer-ap-
proved test kit is listed below.
The test port is located on the front left-hand corner of the
DT1150 units (See Figure 1.1). To access the port, remove
the plexiglass cover from the front of the circuit breaker.
Using a small screwdriver, gently pry up on the test port
cover to remove this item.
The test kit authorized by Cutler-Hammer for use with the
Digitrip units plugs into the test port of the unit and
provides a secondary injection test that simulates currents
from the current transformers. Existing test kits, styles
140D481G02R, 140D481G02RR, 140D481G03 or G04,
along with the Magnum Test Kit Adapter 8779C02G04, can
be used to test the trip unit and circuit breaker.
5.3 Performance Testing for Ground Fault Trip Units
5.3.1 Code Requirements
The NEC, under Article 230-95-C, requires that any ground
fault protection system be performance tested when first
installed. Conduct tests in accordance with the approved
instructions provided with the equipment. Make a written
record of this test and make the results available to the
authority having inspection jurisdiction.
5.2.1 Self Testing
Prior to any self testing, the plexiglass cover will need to
be removed. The Digitrip 1150 provides means via the
TEST selection in the main menu to conduct Phase
Current (PH) or Ground Current (GND) (if applicable) type
testing in either a TRIP or NON-TRIP mode.
The Self Test function cannot be entered if an alarm is
already present. This alarm will need to be cleared before
any self testing can be conducted. The self test function
will terminate if any of the following conditions occur after
the start of testing:
1. Any real Phase current exceeds an alarm setting
2. Any real Ground current exceeds 0.1 per unit.
3. If real Phase current exceeds 1 x (Ir) while
conducting a NON-TRIP test.
4. If real Phase current exceeds 0.5 x (Ir) while
conducting a TRIP test.
5.2.2 Functional Field Testing
CAUTION
PERFORMING TESTS WITHOUT THE CUTLER-HAM-
MER APPROVED TEST KIT MAY DAMAGE THE DIG-
ITRIP UNIT.
Use the test receptacle to verify a functional load test of a
major portion of the electronic circuitry of the Digitrip and
the mechanical trip assembly of the circuit breaker. The
Figure 5.1 Auxiliary Power Module - (Front and Back Views)
Model Test Kit
Digitrip 1150 Test Kit (140D481G02R, 140D481G02RR,
140D481G03, or G04) with Test Kit
Adapter 8779C02G04
Courtesy of NationalSwitchgear.com
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