Littelfuse Startco SE-135, Руководство пользователя, Страница: 24 / 29

Page 20
SE-135 Ground-Fault Ground-Check Monitor
Rev. 3-D-090816
8.5 G
ROUND-
F
AULT
P
ERFORMANCE
T
EST
To meet the requirements of the National Electrical
Code (NEC), as applicable, the overall ground-fault
protection system requires a performance test when first
installed. A written record of the performance test is to be
retained by those in charge of the electrical installation in
order to make it available to the authority having
jurisdiction. A test-record form is provided for recording
the date and the final results of the performance tests.
The following ground-fault system tests are to be
conducted by qualified personnel:
a) Evaluate the interconnected system in accordance with
the overall equipment manufacturer’s detailed
instructions.
b) Verify proper location of the ground-fault current
sensor. Ensure the cables pass through the ground-
fault-current-sensor window. This check can be done
visually with knowledge of the circuit. The
connection of the current-sensor secondary to the SE-
135 is not polarity sensitive.
c) Verify that the system is correctly grounded and that
alternate ground paths do not exist that bypass the
current sensor. High-voltage testers and resistance
bridges can be used to determine the existence of
alternate ground paths.
d) Verify proper reaction of the circuit-interrupting
device in response to a simulated or controlled
ground-fault current. To simulate ground-fault
current, use CT-primary current injection. Fig. 14
shows a test circuit using Littelfuse Startco Ground-
Fault-Relay Test Units. The SE-400 has a
programmable output of 0.5 to 9.9 A for a duration of
0.1 to 9.9 seconds. Set the test current to 120% of GF
TRIP LEVEL. The SE-100T provides a test current of
0.65 or 2.75 A for testing 0.5- and 2.0-A trip levels.
Inject the test current through the current-sensor
window for at least 2.5 seconds. Verify that the
circuit under test has reacted properly. Correct any
problems and re-test until the proper reaction is
verified.
e) Record the date and the results of the test on the
attached test-record form.
TABLE 3. G
ROUND
-F
AULT
-T
EST
R
ECORD
D
ATE
T
EST
R
ESULTS
Retain this record for the authority having jurisdiction.