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I N S TA L L AT I O N , O P E R AT I O N S A N D M A I N T E N A N C E M A N U A L
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The MCC can be welded to the floor. However,
52 Floor cut-outs
it is recommended that the customer follow
appropriate welding techniques and treat the
welded area with a corrosion-resistant coating.
If mounted on a base frame or raised foundation,
ensure that the height from the floor to the center
of the top handles will comply with NFPA 70
National Electrical Code (NEC) Article 404.8 and UL
Standard 845. The distance from the floor to the
center of the highest handle must not be greater
than 2043 mm (80 in) to comply with most
standards.
Installation on false floors
Ensure that the base of each section rests evenly on
the supports. A minimum floor height of 500 mm or
(20 in) is recommended to accommodate the
bending radius of the cables and provide adequate
accessibility.
• The horizontal tolerance of the frame must not
exceed ±1 mm (0.039 in) over a length of 1 m
(39.4 in).
• The subfloor must be firm to avoid settling,
especially when using insulation layers and
adhesives.
• The false floor must have a carrying capacity of
20 kN/m2 (2.9 PSI) compression load from top to
bottom.
Cable connections and wiring
Installing connections – general Information
All conduit installations should conform to local
codes and be compatible with the NEMA
environmental rating of the MCC. Install conduit
away the ground bus bar to avoid possible damage.
Position the cable connection to minimize bending
and maintain relative vertical alignment to
incoming connections. When installing cable, make
sure the temperature is above 0 °C (32 °F) unless
the cable is appropriate for installation at lower
temperatures.
On every connection, verify the compatibility of
wire size, type and stranding for the type of
power terminations (lugs or terminals).
Use correct lugs in all applications. Crimp
compression lugs with the manufacturer-
recommended tools. Properly connect all line
and load cables to avoid a bolted-fault and
equipment damage.
Danger: Verify that all cables are
de-energized prior to installing.
Use the MCC electrical schematics provided to
verify field wiring connection points. Determine
the phase of each cable before making the
connection. Tighten any unused bolts.
If your installation has top incoming connections:
• Refer to the elevation drawings shipped with the
MCC to check space availability for incoming
cables.
• Make the connections only after the MCC is in
place, leveled, anchored and the sections joined
and spliced. Bring the conduit into the top of the
incoming section.
If the top plate has to be modified for the incoming
conduit, remove the lifting angle and top plate to
perform the modifications. Do not drill or cut the
top plate while still attached to the MCC in order to
avoid metal chips falling into MCC, which can cause
serious damage to the equipment.
After modification, replace the top plate and lifting
angle bolts to guard against dust or dirt from
entering the top horizontal wireway. The lifting
angle bolts can also be removed and the holes
plugged. See Crane Handling in this manual.
Optional bottom plates can be removed for
modification.
Modular 2200mm
2
2
1
W-50
W-100
With no bottom plate
With bottom plate
Modular 2300mm
2
2
1
W-50
W-100
With no bottom plate
With bottom plate
Full selection 2000 and 2300mm
1
1
W-50
W-100
With no bottom plate
With bottom plate
—
50
31
Space for cabling
1
(Vertical Wireway
(100 and 200mm)
1
only for Modular)
Space for cabling
2
until an
obstruction after
221mm (8.7")
Space for cabling
3
until an
obstruction after
175mm (6.89")
1
Diagonal Sheet
4
metal to separate
the Main Bus
Compartment
W: Total width of
section
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