Joining Type 1, Type 1 Gasketed, and Type 12 Sections

To mount and splice a new MCC section to an existing Model 6 section, or to join factory shipping splits:

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 upper and lower horizontal wireway covers in all sections, providing access to each section’s front splicing bolts (see Motor Control Center Views, View B).

   Motor Control Center Views
   View A: All Covers in Place	View B: Horizontal Wireway Covers Removed	View C: Two-piece Bus Barriers Removed (splice connection made)

3. Gain access to each section’s bus splicing provisions buy sliding the panels of the two-piece bus barriers (see Motor Control Center Views, View C) in the sections adjacent to a splice connection (the left and right sections).

4. Make provisions for fastening the structure(s) to the floor and wall. See Securing Structures to the Floor, Seismic Certification of Model 6 MCCs, Responsibility for Mitigation of Seismic Damage, Securing Structures to Floor—Seismic Hazard Designated Locations, and Securing Structures to Wall—Seismic Hazard Designated Locations for fastener locations.

5. Supporting the MCC by its base channels and/or lifting angles, lift it into place. The front edges of the base channels must align to form a continuous front in a straight line. Use a chalk line, string, or other method to align the front base channels in a straight line.

6. Using the notches in the base channels, carefully move the sections in to alignment with a crowbar (see Base Channel Notches).

   NOTE: Follow all manufacturer-specified instructions and precautions when moving heavy equipment. See Handling the MCC before moving the MCC.

Base Channel Notches

Hardware Kit

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. The hardware kit for joining sections (see Hardware Kit) is bagged and tied to the right front corner channel of each shipping split.

3. Locate the four half-circle shaped notches on the inside surface of the corner channels (see Bolting Sections Together: Joining Corner Channels, View A).

4. Using four of the 3/4 in. x 1/4-20 hex head thread-forming screws supplied in the hardware kit, join the front vertical corner channels by inserting the screws through the clearance holes located within the half-circle shaped notches and into the mating thread-forming hole (see Bolting Sections Together: Joining Corner Channels, View B).

   NOTE: Insert the screws from whichever side provides the easiest access to the holes; either side allows proper joining of the channels.

5. Tighten the screws (see Bolting Sections Together: Joining Corner Channels, View C).

6. Repeat steps 3–5 to connect the rear corner channels.

Bolting Sections Together: Joining Corner Channels
View A	View B		View C

1. Locate two clearance holes for 1/4-20 hardware on the inside surface of the bottom section side channels (see Bolting Sections Together: Joining Corner Channels, Views A and B). These are accessible after removal of the bottom wireway cover.

   Bolting Sections Together: Joining Corner Channels
   View A: Front Bottom Side Channel Connection		View B: Rear Bottom Side Channel Connection

   View C: Top Front Side Channel Connection

   View D: Top Rear Side Channel Connection (Shown with MCC back plates removed.)

2. Use two of the four 1-1/4 in. x 1/4-20 hex head thread-forming screws supplied in the hardware kit to join the bottom section side channels. The screw installed at the front is installed from the right-hand section (see Bolting Sections Together: Joining Corner Channels, View A).

3. The screw installed at the rear is installed from the left-hand section (see Bolting Sections Together: Joining Corner Channels, View B).

4. Locate two clearance holes for 1/4-20 hardware on the inside surface of the top section side channels. The front clearance hole is in the left section and is accessible after removal of the top wireway cover (see Bolting Sections Together: Joining Corner Channels, View C).

5. The rear clearance hole is in the right section. In most cases, it is necessary to remove the section back plate or the top plate to gain access to the rear clearance hole and install the screw (see Bolting Sections Together: Joining Corner Channels, View D).