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Recommended hand tools
Metric hardware is used on these circuit
breakers.
The following list of hand tools describes
those normally used in disassembly and re-
assembly procedures:
Open-end wrenches: 7, 8, 10, 13, 17, 19
and 24 mm
Open-end wrench: 55 mm used to
exchange shock absorber (Quantity: two
pieces are required for the task)
Sockets: 7, 8, 10, 13 and 17 mm
Socket: 36 mm (used for replacing post
insulators)
Deep sockets: 19 and 24 mm
Hex keys: 5, 6, 8 and 10 mm
Torque wrench: 0-150 Nm
(0-100 ft-lbs)
Screwdrivers: 0.032 x 1/4 in wide and
0.055 x 7/16 in wide
Pliers
Light hammer
Mechanic's mirror
Flashlight
Drift pins: 1/8, 3/16 and 1/4 in
Retaining ring plier (external type, tip
diameter 0.038 in).
Hazardous voltages and stored energy.
Will cause death, serious injury or property damage.
De-energize before working on this equipment.
Read instruction manuals, observe safety instructions and use qualified
personnel.
Recommended maintenance and
lubrication
Periodic maintenance and lubrication should
include all the tasks shown in Table 1.
Recommended procedures for each of the
listed tasks are provided in this section of the
instruction manual.
The list of tasks in Table 1: Maintenance tasks
on page 24 does not represent an exhaustive
survey of maintenance steps necessary to
ensure safe operation of the equipment.
Particular applications may require further
procedures. Should further information be
desired or should particular problems arise
that are not covered sufficiently for the user's
purposes, the matter should be referred to
the local Siemens sales office.
Checks of the primary power path
The primary power path consists of the three
vacuum interrupters, the three fixed-end and
three moving-end connections to the
enclosure bus system. These components are
checked for cleanliness and condition. The
vacuum interrupters are also checked for
vacuum integrity.
Some test engineers prefer to perform the
contact-erosion check during the manual
spring-charging check of the operator, since
charging of the springs is necessary to place
the contacts in the CLOSED position.
Also, the vacuum-integrity check is usually
performed in conjunction with the high-
potential tests.
These instructions assume these tests
(contact-erosion/manual spring-charging
check and vacuum-integrity/high-potential
tests) will be combined as described.
23
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