8
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
Connections to an MVA metal-clad switchgear assembly
Indoor switchgear
Follow the same procedure as given in Connections to AMPGARD
medium voltage motor control center (MCC) .
Outdoor switchgear
Step 1: Position the units side by side . The holes in MVS-ND side
sheet around bus cutout will match the holes in metal-clad
switchgear flange .
Step 2: Press the sponge neoprene gasketing tape supplied with
MVS-ND switchgear onto flange to form a weather-tight
seal .
Step 3: Join the enclosures using the bolts supplied with MVS-ND
switchgear . The opposite side of the metal-clad switchgear
flange has nuts in place for ease of connection .
Step 4: Make the bus connections as detailed in Connection
by busbar .
Connection of customer power cables
Figure 4 through Figure 6 show the suggested means for connection
of the incoming or exiting cables (maximum of two per phase,
500 kcmil) in MVS-ND switchgear . All necessary materials to
perform the cable installation are to be provided by others unless
specifically noted otherwise in the detailed instructions below, or
where specifically purchased with the switchgear assembly . To install
the incoming and exiting cables, follow these instructions .
Switchgear terminals
For incoming power, the terminals are usually located at the top of
the switch in a vertical section . For outgoing circuits, the terminals
are beneath the switch . Each terminal pad has a two-hole pattern
suitable for either a single-hole terminal or a terminal with a two-hole
National Electrical Manufacturers Association (NEMA) drilling pattern .
The terminal lugs for the cable, if purchased with the switchgear,
will be bolted to the switchgear terminals . If the terminal lugs are
not there, then they are to be provided by others . The terminals of
the switchgear are not suitable to support the weight of the cable .
It will be necessary to support the weight of the cable with a cable
support angle .
WARNING
FAILURE TO INSTALL THE CABLE SUPPORT MAY RESULT IN DAMAGE
TO THE SWITCHGEAR TERMINALS, WHICH IN TURN MAY RESULT IN
MAJOR EQUIPMENT DAMAGE AND CAUSE SEVERE PERSONAL INJURY
OR DEATH.
Cable electrical stress relief devices
The design of MVS-ND switchgear is based upon the use of
“preformed” type electrical stress relief devices such as 3-M
Quickterm-II
T
, Raychem
T
heat shrink termination systems, etc .
The stress relief devices are to be provided by others .
Lacing cord or other equivalent materials/means
The cables must be lashed together to restrain the cables if a short
circuit should occur . This material is to be provided by others . For
large cables and/or cable reverse loops, it may also be necessary
to lash the cable bundle(s) to a support channel .
WARNING
FAILURE TO LASH THE CABLES TOGETHER MAY RESULT IN DAMAGE TO
THE SWITCHGEAR, WHICH IN TURN MAY RESULT IN MAJOR EQUIPMENT
DAMAGE AND CAUSE SEVERE PERSONAL INJURY OR DEATH. THE CABLE
MUST BE LASHED TOGETHER AS INSTRUCTED IN THIS DOCUMENT.
Figure 4. Top Cable Entrance, Bottom Cable Exit (or Reverse).
Figure 5. Top Cable Entrance, Top-rear Cable Exit (or Reverse).
