Rockwell Automation 140U N-Frame Circuti Breakers Instruction Leaflet for N-Frame Circuit Breakers - Manual (Page 12)

Page 12
SOME COMMERCIAL CLEANING AGENTS WILL
DAMAGE THE NAMEPLATES OR MOLDED PARTS.
MAKE SURE THAT CLEANING AGENTS OR SOL-
VENTS USED TO CLEAN THE CIRCUIT BREAKER
ARE SUITABLE FOR THE JOB.
6.1 Remove dust, dirt, soil, grease, or moisture from the
surface of the circuit breaker using a lint-free dry
cloth, brush, or vacuum cleaner. Do not blow debris
into the circuit breaker. If contamination is found,
look for the source and eliminate the problem.
6.2 Switch circuit breaker to ON and OFF several times
to be sure that the mechanical linkages are free and
do not bind. If mechanical linkages are not free,
replace circuit breaker.
6.3 With the circuit breaker in the ON position, press the
PUSH-TO-TRIP button to mechanically trip the cir-
cuit breaker. Trip, reset, and switch circuit breaker
ON several times. If mechanism does not reset each
time the circuit breaker is tripped, replace the circuit
breaker.
6.4 Check base, cover, and operating handle for cracks,
chipping, and discoloration. Circuit breakers should
be replaced if cracks or severe discoloration is found.
6.5 Check terminals and connectors for looseness or
signs of overheating. Overheating will show as dis-
coloration, melting, or blistering of conductor insula-
tion, or as pitting or melting of conductor surface due
to arcing. If there is no evidence of overheating or
looseness, do not disturb or tighten the connections.
If there is evidence of overheating, terminations
should be cleaned or replaced. Before re-energizing
the circuit breaker, all terminations and cable should
be refurbished to the same condition as when origi-
nally installed.
6.6 Check circuit breaker mounting hardware, and
tighten if necessary.
6.7 Check area where circuit breaker is installed for any
safety hazards, including personal safety and fire
hazards. Exposure to certain types of chemicals can
cause deterioration of electrical connections.
7. PERFORMANCE TESTING FOR GROUND FAULT
CIRCUIT BREAKERS
7.1 Code Requirements
The National Electric Code under Article 230-95-C
requires that any ground-fault protection system be per-
formance tested when first installed. The test shall be
conducted in accordance with approved instructions pro-
vided with the equipment. A written record of this test
shall be made and shall be available to the authority hav-
ing inspection jurisdiction.
7.2 Standards Requirements
As a follow-up to the basic performance requirements
stipulated by the N.E.C. as stated above in 7-1, UL Stan-
dard No. 1053 requires that certain minimum instructions
must accompany each ground fault protection system.
These following statements plus a copy of the test record
form illustrated in Fig. 7-2 are shipped with each N-frame
ground fault circuit breaker.
7.3 General Test Instructions
7.3.1 The interconnected system shall be evaluated in
accordance with the equipment assembler's detail
instruction by qualified personnel.
7.3.2 The polarity of the neutral sensor connection (if
used) must agree with equipment assembler's
detailed instructions to avoid improper operations
following apparently correct simulated test opera-
tions. Where a question exists, consult the speci-
fying engineer and/or equipment assembler.
7.3.3 The grounding points of the system shall be veri-
fied to determine that ground paths do not exist
that would bypass the sensors. High-voltage
testers and resistance bridges may be used.
THERE IS A HAZARD OF ELECTRICAL SHOCK OR
BURN WHENEVER WORKING IN OR AROUND ELEC-
TRICAL EQUIPMENT. ALWAYS TURN OFF POWER
SUPPLYING BREAKER BEFORE CONDUCTING
TESTS.
Note: Since the ground fault circuit breakers derive
their operating power from the phase current, and
not from the neutral current, passing current through
the neutral sensor only will not properly test the
ground fault feature.
CAUTION
WARNING
40752-093(1 ) Effective 5/02