Section 6 - Maintenance; General Requirements - GE BreakMaster Installation And Maintenance Manual

BreakMaster Load Interrupter Switch
Inspection and Maintenance:
Control Circuit Parts
Inspection Item
Closing and opening
devices including
disconnects
Wiring
Terminals
Operating Mechanism
Inspection Item
Motor
Tightness of hardware No loose or missing parts
Dust or foreign matter No dust or foreign matter
Lubrication
Deformation or exces-
sive wear
Manual operation
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 insulators and operating arms, should be thoroughly cleaned periodically by wiping with a
clean cloth to prevent 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 make good contact.
A contact resistance measurement 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.
Criteria
Smooth and correct
operation by control power
Securely tied in proper place Visual Check
Tight
Criteria
5000 operations
Smooth operation and no
excessive wear
No excessive deformation or
wear
Smooth and crisp operation Manual closing and opening Correct if necessary
! DANGER
Make sure that all power sources
are deenergized before attempting
any maintenance.
Inspection Method
Test closing and opening
of the switch twice
Visual Check
Inspection Method
Check condition
Visual and tightening with
appropriate tools
Visual check
Sight and feel
Visual and operational
Corrective Action (if necessary)
Replace any defective device
Repair or tie if necessary
Tighten or replace if necessary
Corrective Action (if necessary)
Replace brushes
Tighten or reinstate if necessary
Clean as necessary
Lubricate very sparingly with
light machine oil
Remove cause and replace parts
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