Single Pole Molded Case Breakers - ETI PI-800-GEN2 Instruction Manual

Electrical Test Instruments PI-800 GEN2 and PI-1600 GEN2
overload trip or test set damage.
It is also important to note that a severely overheated test set may not pro-
duce as much instantaneous current as it will when cool, due to higher re-
sistance of copper buswork when hot. Copper has about 50% higher resistance
at 100 degrees C than it does at 25 degrees C. For this reason, it may be best to
perform instantaneous tests before heating the test set and buswork or cables
with long time tests.
SINGLE POLE MOLDED CASE CIRCUIT BREAKERS
Timing Test
1. Consult breaker manufacturer's literature to determine any necessary pre-
cautions and expected test results. A test current of three times the rating
of the breaker should be used for this test.
2. Follow steps 1 through 17 in pre-test installation and setup, as required, to
set up the breaker test set.
3. Setup MAC-21 for C.L. Maint (MAINTAIN on).
4. Set MAC-21 RANGE to lowest range that is greater than desired test cur-
rent.
5. Set TIMEBASE to CYCLES.
6. Press PRESET key. Adjust preset time to 5.0 cycles. This value may be set
higher or lower, depending on trip characteristics of breaker.
7. Press PRESET again to return to normal mode.
8. Select MEMORY mode.
9. Repeatedly jog the INITIATE button, while adjusting the OUTPUT
CONTROL higher, until the desired test current is read on the ammeter. If
insufficient current is obtained at maximum position of the vernier, set the
OUTPUT TAP control to the next higher tap, return the vernier to zero, and
continue.
10. Press RESET button.
11. Set TIMEBASE to SECONDS.
12. Select MAINTAIN mode.
13. Press and release INITIATE key; OUTPUT ON light should glow, timer
should run, and current display should read desired output current.
14. While test is running, observe current reading. If necessary, adjust to cor-
rect value by using vernier control, or press MAINTAIN key for current hold.
15. When breaker trips, the test set output should de-energize, timer should
stop, and OUTPUT ON light should turn off.
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