Instruction Book
Pa
e37
IB131009EN
·
SECTION 6: INSPECTION AND
MAINTENANCE
6-1
•DO NOT WORK ON A BREAKER IN THE "CON-
NECTED" POSITION.
•DO NOT WORK ON A BREAKER WITH SEC-
ONDARY DISCONNECTS ENGAGED.
•DO NOT WORK ON A BREAKER WITH SPRINGS
CHARGED OR CONTACTS CLOSED.
•DO NOT DEFEAT ANY SAFETY INTERLOCKS.
•DO NOT LEAVE MAINTENANCE TOOL IN THE
SOCKET AFTER CHARGING THE CLOSING
SPRINGS.
•DO NOT STAND LESS THAN ONE METER AWAY
FROM THE BREAKER WHEN TESTING FOR VACU-
UM INTEGRITY.
FAILURE TO FOLLOW ANY OF THESE INSTRUC-
TIONS MAY CAUSE DEATH, SERIOUS BODILY
INJURY, OR PROPERTY DAMAGE. SEE SECTION 2-
SAFE PRACTICES FOR MORE INFORMATION.
6-2 FREQUENCY OF INSPECTION
Inspect the breaker once a year when operating in a
clean, non corrosive environment. For a dusty and cor-
rosive environment, inspection should be performed
twice a year. Additionally, it is recommended to inspect
the breaker every time it interrupts fault current.
Refer to the table on the following page for maintenance
and inspection check points.
6-4 VACUUM INTERRUPTER INTEGRITY TEST
Vacuum interrupters used in all circuit breakers are
highly reliable interrupting elements. Satisfactory per-
formance of these devices is dependent upon the
integrity of the vacuum in the interrupter and the internal
dielectric strength. Both of these parameters can be
readily checked by a one minute ac high potential test.
(See Table 6.1 for appropriate test voltage.) During this
test, the following warning must be observed:
Apply one drop of mineral oil
at locations shown
View A-A
Figure 6-1 Lubrication points
WARNING
To Next Page
Loading...
