Effective 9/21/99
Page 9
I.L. 70C1080H01
Fig. 10.2 Connection Details for Conducting Single
Phase Current Tests with the Breaker
Removed from the Cell
WARNING
PERSONAL INJURY CAN OCCUR WHEN WORKING
ON POWER SYSTEMS. ALWAYS TURN OFF POWER
SUPPLYING BREAKER BEFORE CONDUCTING
TESTS. TEST OUT OF THE CELL, IF POSSIBLE.
THERE IS A HAZARD OF ELECTRICAL SHOCK OR
BURN WHENEVER WORKING IN OR AROUND ELEC-
TRICAL EQUIPMENT.
10.4.5 Cutler-Hammer Test Kit Check
The functions of your newly installed Ground Alarm /
Power Supply module can also be confirmed with an
optional, test kit authorized by Cutler-Hammer. This
device can provide secondary injection currents to the
ground element of the trip unit that simulates currents
from the current transformers.
Follow the detailed instructions of the particular test kit to
initiate a ground trip and verify the alarm, contact closure
and breaker trip action.
The test port is located on the front left-hand corner of the
Trip Unit. To access the port, remove the plexiglass cover
from the front of the circuit breaker. Using a small screw-
driver, gently pry up on the test port cover to remove this
item.
Verify the grounding points of the system using high-
voltage testers and resistance bridges to ensure that
ground paths do not exist that could bypass the sensors.
Use a low-voltage (0 to 24 volt), high-current, AC source
to apply a test current of 125 percent of the Digitrip unit
pickup setting through one phase of the circuit breaker.
This should cause the breaker to trip (on LSIG style trip
units) in less than 1 second and operate the alarm
indicator. Reset the breaker and the alarm indicator.
Repeat the test on the other two phases (see Fig. 10.1).
Apply the same current as described above through one
phase of the breaker, returning through the neutral
sensor. The breaker should not trip and the alarm indica-
tor should not operate. Repeat the test on the other two
phases.
Figure 10.1 Connection Details for Conducting Single
Pole, Single Phase Current Tests with the
Breaker Removed from the Cell
Apply the same current as described above through any
two phases of the breaker. The breaker should not trip,
and the alarm indicator,
if one is supplied, should not
operate. Repeat the test using the other two combinations
of breaker phases (see Fig. 10.2).
CAUTION
RESTORE ALL TEMPORARY CONNECTIONS MADE
FOR THE PURPOSE OF CONDUCTING TESTS TO
PROPER OPERATING CONDITIONS BEFORE RE-
TURNING THE BREAKER TO SERVICE.
Model
Test Kit
Digitrip DT20 family
Test Kit (140D481G02R, 140D481G02RR,
140D481G03, or G04) with Test Kit
Adapter 8779C02G04
