Moving or Installing Additional MCC Units

Factory assembled MCCs include installed units as shown in the order drawings. On occasion, it may be necessary to relocate a unit from its original position or add a new unit purchased separately. Plug-on units require a midshelf and a unit door are attached to the structure. Follow these instructions for installing or relocating a midshelf and door.

DANGER

Hazard of Electric Shock, Explosion, or Arc Flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, CSA Z462, or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment and follow lockout/tagout procedures 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 these instructions will result in death or serious injury.

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. Position the midshelf (Shelf and Door Installation, View A) in the appropriate area of the structure.

   NOTE: Arc-rated MCCs have a midshelf specifically designed for arc-rated MCCs (see Midshelf for Arc-Rated MCCs). This midshelf includes arc pressure relief flaps and must be used when installing arc-rated MCC units to maintain the arc containment ratings.

   Midshelf for Arc-Rated MCCs

   
   NOTE: Some midshelves may be equipped with automatic bus shutters. Instructions for installation and removal of automatic bus shutters can be found in instruction bulletin 80459-641-01, Model 6 Motor Control Centers.

3. Place the mounting foot (Shelf and Door Installation, View B) of the shelf into the mounting pan slots (C). Secure the shelf at the mounting foot end, the left side, and the right side with flat head screws (Detail A, D).

4. Install the hinge leaves of the door (Detail A, E) into the hinge slots (G), which are on the structure corner channel. Fasten the hinge leaves to the structure corner channel using Torx® head screws (H).

5. Install fastener receptacles (Detail B, J) into the bracket slots (K) and fasten with Torx head screws (H).

Shelf and Door Installation