Appendix B—Non-Conductive Horizontal Bus Barrier Retrofit 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 power is off.

2. Remove the screws that secure the top horizontal wireway cover to the structure, and then remove the cover.

1. Remove the screw located at the top of the two-piece bus barriers.

2. Remove the screw located at the bottom of the two-piece bus barriers.

3. Pull the two metal barriers out of the MCC and discard them.

If applicable, remove the plug-in unit below the topshelf (see Remove Existing Brackets on the 15 in. (381 mm) Deep MCC).

Refer to either the Model 5 MCC Installation and Maintenance Manual (8998IM9101) or Removing the Control Unitfor unit removal instructions. If necessary, contact your local Schneider Electric field sales representative to obtain this bulletin.

If the MCC is 15 in. (381 mm) deep, use a 1/8 in. (3 mm) drill bit to remove the rivets that hold the right and left horizontal bus barrier brackets in place (see Remove Existing Brackets on the 15 in. (381 mm) Deep MCC). Discard the brackets after removal.

DANGER
Hazard of Electric Shock, Explosion, or Arc Flash Drilling increases the chance of loose particles in the MCC. Confirm that the compartment is free of loose particles before turning on power to this equipment. Failure to follow these instructions will result in death or serious injury.

Remove Existing Brackets on the 15 in. (381 mm) Deep MCC

Follow the applicable instructions below to install retrofit brackets into 15 in. (381 mm) or 20 in. (508 mm) deep MCCs. The top retrofit bracket must sit flush against the side channel. Slide the black grommets toward the back of the MCC.

• 15 in. (381 mm) deep MCC: Use a rivet gun and two rivets in the retrofit kit to attach the retrofit brackets to the left and right-side channels (see 15 in. (381 mm) Deep MCC Retrofit Bracket).

  15 in. (381 mm) Deep MCC Retrofit Bracket

  

• 20 in. (508 mm) deep MCC: Use the screws provided in the retrofit kit to attach the retrofit brackets to the left and right-side channels. Align the holes in the bracket and side channel as shown in 20 in. (508 mm) Deep MCC Retrofit Bracket.

  20 in. (508 mm) Deep MCC Retrofit Bracket

  

Follow the steps below to install the endcaps (see Endcap Placement).

Endcap Placement

1. Rivet one endcap into place on the retrofit bracket or the side channel, either to the right or left side of the structure.

2. Insert one end of the top track into the attached endcap.

3. Place the other endcap on the opposite end of the top track and slide the top track into place.

4. Rivet the second endcap to the retrofit bracket.

1. Using a 1/8 in. (3 mm) drill bit, drill out both rivets on the horizontal bus barrier bracket (the L-shaped bracket located on the topshelf (see Horizontal Bus Barrier (L-shaped) Bracket). Remove the bracket and discard it.

   Horizontal Bus Barrier (L-shaped) Bracket

   

2. Install the bottom retrofit track (see Welded and Relay Topshelf Assemblies).

   • Welded topshelf: Align the holes of the shelf with those on the bottom track (see Welded and Relay Topshelf Assemblies). Rivet the track and the retrofit bracket to the topshelf.

     NOTE: If the bus contains four laminations, access the rivet holes from underneath the topshelf.

   • Relay topshelf: Align the two holes on the relay shelf with the bottom retrofit bracket holes (see Welded and Relay Topshelf Assemblies). Mark the places where you will drill other holes to secure the bottom track to the shelf. Drill the holes using a drill bit ranging from 0.136.–0.147 in. (3–4 mm) in diameter. Rivet the track and retrofit bracket to the topshelf.

     NOTE: The bottom retrofit track can be riveted directly onto the relay topshelf only if the relay assembly topshelf has two holes instead of four.

   Welded and Relay Topshelf Assemblies
   Welded Topshelf	Relay Topshelf