Currents
Each test selected by the Select Test switch on the test kit
supplies a fixed milliampere/millivolt value. The rating plug, such
as the long delay setting, will affect the per unit (Ir) current
value and the response of the Digitrip unit.
Batteries
The functional test kit contains a total of seven 9V batteries.
A lithium ion cell is the preferred battery type for BAT A and is
attached to the main PC board of the test kit. This battery has a
much longer life span to accurately perform the selected tests.
The remaining six batteries are located on a separate board in
the test kit and serve to power up the Digitrip 520/520M trip
unit.
LEDs A and B function to represent sufficient battery voltage
from both the single lithium cell and the six alkaline batteries,
respectively. If either LED does not light or lights only dimly,
replace the appropriate battery or batteries within the functional
test kit case. To do this, open the back of the case with a
screwdriver and remove the battery or batteries from their
respective locations. For best results, replace lithium battery
(Battery A) with ULTRALIFE™ 9V battery. When replacing
battery six-pack (Battery B), replace all batteries at the same
time using standard 9V alkaline batteries.
Performance testing for ground fault trip units—primary
injection
Code requirements
Many local or country building codes require 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.
Standards requirements
For basic performance requirements stipulated by the NEC, UL
Standard No. 1053 requires that certain minimum instructions
must accompany each ground fault protection system. These
statements plus a copy of the record forms are included as part
of this instructional leaflet.
Test instructions
The interconnected system must be evaluated only by qualified
personnel and in accordance with the equipment assembler’s
detailed instructions.
To avoid improper operations following apparently correct
simulated test operations, the polarity of the neutral sensor
connections (if used) must agree with the equipment
assembler’s detailed instructions. Where a question exists,
consult the specifying engineer and/or equipment assembler.
•
WARNING
ELECTRICAL SHOCK OR BURN INJURY CAN OCCUR WHEN WORKING
ON POWER SYSTEMS. ALWAYS TURN OFF THE MAIN POWER THAT
IS SUPPLYING THE CIRCUIT BREAKER BEFORE CONDUCTING TESTS.
TEST OUT OF THE CELL, IF POSSIBLE.
29
EATON
www.eaton.com
Effective September 2013
Instructional Leaflet IL01301064E
Operating Manual for Series NRX
Digitrip Trip Units 1150 / 1150i
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 ground pickup setting
through one phase of the circuit breaker. This should cause the
circuit breaker to trip in less than 1 second and operate the
alarm indicator, if one is supplied. Reset the circuit breaker and
the alarm indicator. Repeat the test on the other two phases
(see
Figure 17
).
Apply the same current as described above through one phase
of the circuit breaker, returning through the neutral sensor if
a neutral sensor is used. The breaker should not trip, and the
alarm indicator, if one is supplied, should not operate. Repeat
the test on the other two phases.
