11
Instruction Booklet
IB022003EN
Effective April 2018
Revision #3
Instructions for installation, operation, and
maintenance of Type MVS-ND, metal-enclosed
switchgear assemblies: 4.76 kV or 15.0 kV class
EATON
www.eaton.com
Operation
Mechanical safety interlocks
The MVS-ND manually operated switch is equipped with switch
interlocks and door interlocks as well as provisions for padlocking in
either the open or closed position . See IB022004EN for details of
the interlocks and their functions .
Key interlocking
Key interlocks are supplied when specified, but certain MVS-ND
switchgear configurations require key interlocks and they are
therefore included . Standard schemes are available for locking the
switch in the open position or the closed position, as well as locking
the main door closed . Numerous other schemes are available
for special requirements that must coordinate with upstream or
downstream devices supplied by Eaton or other equipment .
Maintenance
WARNING
FAILURE TO COMPLETELY DISCONNECT THE MVS-ND SWITCHGEAR
ASSEMBLY FROM ALL POWER SOURCES PRIOR TO INSPECTION MAY
RESULT IN SEVERE INJURY OR DEATH. THE SWITCHGEAR ASSEMBLY
MUST BE COMPLETELY DISCONNECTED FROM ALL POWER SOURCES
AND GROUNDED BEFORE PERFORMING ANY INSPECTION.
Inspection schedule
The switchgear should be inspected on a regular periodic basis to
ensure all components are functioning correctly and the insulation
system integrity is being maintained . See the appropriate instruction
documents for the component devices .
Inspection procedure
Wipe away any dust or dirt that may have accumulated inside each
switchgear vertical section, paying close attention to insulators and
insulating material . If the bus is insulated, see Electrical parts and
insulation check and cleaning for cleaning procedures .
Insulation and conductor maintenance
Insulated bus coverings made from NORYL
Insulated bus coverings are made from NORYL, a high-performance
engineering thermoplastic . NORYL can be irreversibly damaged
if it comes in contact with certain chemicals . Such petroleum
containing products as solvents, oils, greases, and electrical joint
compounds are especially harmful . Engineering, should not come
in contact with the NORYL . Only specified tapes and fillers should
be used when insulating busbar joints . See Field taping of electrical
connections on Page 14
for details .
Electrical parts and insulation check and cleaning
De-energize primary circuits before removing any enclosure parts .
Before cleaning, take “MEGGER” readings between live parts and
to ground . Inspect for signs of overheating or weakened insulation .
Remove dust from conductors, live parts, insulators, component
insulation, live parts, and enclosure surfaces . An industrial grade
vacuum cleaner would assist this procedure . Wipe clean with
isopropyl alcohol or distilled water only, then wipe dry .
WARNING
NORYL INSULATED EQUIPMENT: ELECTRICAL JOINT COMPOUNDS MUST
NOT BE USED ON CONNECTIONS OR TERMINATIONS TO OR FROM THIS
EQUIPMENT. DO NOT USE SOLVENTS, OILS, OR GREASES ON OR NEAR
THIS EQUIPMENT. WATER AND ISOPROPYL ARE THE ONLY APPROVED
CLEANERS FOR THIS EQUIPMENT.
CAUTION
ISOPROPYL ALCOHOL IS FLAMMABLE. PROVIDE ADEQUATE VENTILATION
AND KEEP AWAY FROM FLAMES AND OTHER IGNITION SOURCES.
CONSULT YOUR SAFETY DEPARTMENT BEFORE USING.
