12
Instructional Booklet
IB02102006E
Effective May 2011
Type MVS (previously WLI)
metal-enclosed switchgear—
4.76 kV, 15.0 kV, 27.0 kV, and 38.0 kV
eaton corporation
www.eaton.com
Field insulation methods
Method 1—using an insulating boot
Step 1e:
Clean the area of dirt and foreign matter . Use a clean, dry
cloth or, if necessary, dampen slightly with distilled water . Do not
use any abrasives or solvents .
Step 2e:
Place the boot over the joint so that it fits in place . Fasten
together with plastic wire ties . Cut off excess ends of plastic wire ties .
Method 2—using insulating tape and filler
General
Step 1e:
Elongate the insulating tape 10 to 25% during application to
ensure a smooth, tight fit . On pads, elongate the corners only .
Step 2e:
Should a tape roll expire during application, start the new
role by overlapping the previous end by 1/2 turn .
Joint—no hardware
Step 1e:
Clean the area of dirt and foreign matter . Use a clean, dry
cloth or, if necessary, dampen slightly with distilled water . Do not
use any abrasives or solvents .
Step 2e:
Apply one turn of 1 .00 inch (25 .4 mm) tape so that half
of the tape is on the conductor and half is on the pre-insulation .
Overlap the tape ends 1 .50 inches (38 .1 mm) .
Step 3e:
Apply one layer of insulating tape, lapping as specified in
Table 2
, overlapping any pre-insulation by 1 .50 inches (38 .1 mm) .
Joint—with hardware
Step 1e:
Clean the area of dirt and foreign matter . Use a clean, dry
cloth or, if necessary, dampen slightly with distilled water . Do not
use any abrasives or solvents .
Step 2e:
Apply the filler over the bare conductor and hardware to
cover and to smooth out the surface . Blend the contour into pre-
insulation surfaces . Cover the conductors and hardware with at
least 0 .125 inches (3 .18 mm) of filler .
Step 3e:
Apply pad(s) of insulating tape of sufficient width to overlap
the pre-insulation by 1 .00 inch (25 .4 mm) or more .
Step 4e:
Apply one layer of insulating tape, lapping as specified in
Table 2
, overlapping any pre-insulation or pads by 1 .50 inches
(38 .1 mm) .
Factory-installed Noryl insulation
Factory-installed insulation may be Noryl, a high-performance
engineering thermoplastic . It can be irreversibly damaged if it
comes in contact with certain chemicals . See
page 22
for
cleaning procedures .
WARNING
THE USE OF SOLVENTS, OILS, JOINT COMPOUNDS, OR GREASES ON OR
NEAR NORyL INSULATION WILL DESTROy IT.
CLEAN ONLy WITH WATER OR ISOPROPyL ALCOHOL.
CAUTION
ISOPROPyL ALCOHOL IS FLAMMABLE. PROVIDE ADEQUATE VENTILATION
AND KEEP AWAy FROM FLAMES AND OTHER IGNITION SOURCES.
CONSULT yOUR SAFETy DEPARTMENT BEFORE USING.
Securing MVS switchgear assemblies to foundations
All anchoring hardware and necessary devices are to be supplied by
the installer . If the switchgear assembly was purchased for seismic
applications, follow the instructions on special drawings provided
addressing the anchoring and load bearing requirements in additions
to the following two sections .
Table 2. Taping Chart
MVS kV rating
pre-insulation or
pad overlap (Minimum)
inches (mm)
Lap of tape
insulating tape
number of Layers
number of pads
4.76
1.50 (38.1)
1/2
1
1
Over 4.76
1.50 (38.1)
2/3
2
2
