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Section 6 – Maintenance
6.0
General Requirements
6.0.1 Periodic Checking
Load break switches should be examined and checked once a year or sooner when conditions require it (such as
numerous operations, polluted atmosphere or overloading of the switch). All switches should annually be opened
and closed 2-5 times in succession, not exceeding their rated duty.
6.0.2 Cleaning
All switches, including insulator
s and operating arms, should be thor
oughly cleaned periodically by wiping with a
clean cloth to pr
event accumulations of dust. After cleaning, a light coat of lubrication (non-corrosive, high-tem-
perature grease equivalent to SCH-32 Mobiltemp) should be applied to the contact surfaces. Do not use “cup” or
other grease which may harden upon exposure to air.
6.0.3 Contact Inspection
Check to determine that blades mak
e good contact.
A contact r
esistance measur
ement between jaw spade terminal and hinge spade terminals should be taken and
should be between 35-100 micro-ohms. Insure that the blades can be “opened” from jaw casting with a pulling
force of approximately 30-36 pounds measured at a point between the main blades just below the jaw contact as
previously described. If force is above 30-36 pounds, see alignment procedure, 4.11.1.
DANGER
Make sure that all power sources
are deenergized before attempting
any maintenance.
!
BreakMaster Load Interrupter Switch
I
nspection and Maintenance:
Operating Mechanism
Inspection Item Criteria Inspection Method Corrective Action (if necessary)
Motor 5000 operations Check condition Replace brushes
Tightness of hardware No loose or missing parts
Visual and tightening with
appropriate tools
Tighten or reinstate if necessary
Dust or foreign matter No dust or foreign matter Visual check Clean as necessary
Lubrication
Smooth operation and no
excessive wear
Sight and feel
L
ubricate very sparingly with
light machine oil
Deformation or exces-
sive wear
No excessive deformation or
wear
Visual and operational Remove cause and replace parts
Manual operation Smooth and crisp operation Manual closing and opening Correct if necessary
Control Circuit Parts
I
nspection Item
C
riteria
I
nspection Method
C
orrective Action (if necessary)
Closing and opening
devices including
disconnects
Smooth and correct
operation by control power
Test closing and opening
of the switch twice
Replace any defective device
Wiring Securely tied in proper place Visual Check Repair or tie if necessary
Terminals Tight Visual Check Tighten or replace if necessary
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