Model 6 Motor Control Centers 80459-641-01E
Section 4—Installing the MCC 10/2012
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ENGLISH
Joining New Style NEMA Type 3R
Enclosures to Old Style NEMA
Type 3R Enclosures
This section provides instructions for joining new style NEMA Type 3R
enclosures manufactured after February 1998 to old style NEMA Type 3R
enclosures manufactured before February 1998 (the new MCC enclosure is
3 in. (76 mm) shorter than the existing MCC). Instructions for joining to the left
or right of an existing MCC enclosure (as viewed from the front) are provided in
this bulletin.
For all MCCs in NEMA Type 3R enclosures, the parts required for joining
the enclosures are included in a kit. This kit is shipped with the MCC order
and contains all the parts necessary to join the enclosures.
NOTE: All NEMA Type 3R sections manufactured after February 1998
measure approximately 93 in. (2362 mm) from the bottom of the section to the
top of the deflector.
Joining to the Left Side of an Existing
NEMA Type 3R MCC Enclosure.
1. Turn off all power supplying this equipment before working on or inside
the equipment, and follow lockout/tagout procedures. Always use a
properly rated voltage sensing device to confirm the power is off.
2. Remove the end deflector (see Figure 19) from the leftmost section of
the existing MCC and the end deflector, if supplied, from the rightmost
section of the MCC being added. Discard both end deflectors. Retain the
hardware for installation of new parts.
3. Remove the back plate from the leftmost section of the existing MCC
and also from the rightmost section of the MCC being added. Retain the
back plates and mounting hardware for re-installation.
4. Remove the end plate (see Figure 19) from the leftmost section of the
existing MCC and the end plate, if supplied, from the rightmost section of
the MCC being added. Discard both end plates. Retain the hardware for
installation of new parts.
5. Remove the insulating barrier (see Figure 20 on page 31) from the
leftmost section of the existing MCC by punching out the rivets that
are holding the barrier in place. Repeat this procedure for the barrier, if
supplied, in the rightmost section of the MCC being added. Discard
both barriers.
NOTE: Ensure that rivet parts do not fall into the MCC.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E or CSA Z462.
• This equipment must only be installed and serviced by qualified
electrical personnel.
• Turn off all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to confirm power is off.
• Replace all devices, doors, and covers before turning on power to this
equipment.
Failure to follow this instruction will result in death or serious injury.
Figure 19: Removing the End Deflector
End deflector
End plate
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