Joining to the Right Side of an Existing Type 3R MCC Enclosure

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.

Remove the end deflector (see Removing the End Deflector) from the rightmost section of the existing MCC and the end deflector, if supplied, from the leftmost section of the MCC being added. Retain hardware for use in Step 12. Discard both end deflectors.

Installing the Splice Deflector

Remove the back plate from the rightmost section of the existing MCC and also from the leftmost section of the MCC being added. Retain the back plates and mounting hardware for re-installation.

Remove the end plate (see Removing the End Deflector) from the rightmost section of the existing MCC and the end plate, if supplied, from the leftmost section of the MCC being added. Discard both end plates.

Remove the insulating barrier (see Removing the Insulating Barrier) from the rightmost section of the existing MCC by punching out the rivets that are holding the barrier in place. Repeat this procedure for the barrier, if provided, located in the leftmost section of the MCC being added. Discard both barriers.

Install the left splice bracket (see Installing the Splice Deflector), 94 in. (2388 mm) long, to the right front vertical channel of the existing MCC. Use six 10–32 hex head screws provided in the kit. The long flange of the splice channel will mount to the side of the vertical channel with the short flange near the front of the vertical channel. When properly installed, the bottom of the left splice bracket will be flush with the bottom of the vertical channel.

Install the right splice bracket (see Installing the Splice Deflector), 90 in. (2286 mm) long, to the left splice bracket installed in Step 6 using six 10–32 flat Phillips head screws provided in the kit. Ensure that the short flange of the right splice bracket is in front of the flange of the left splice bracket. When properly installed, the left splice bracket will extend approximately 1 in. (25 mm) below the right splice bracket.

Position the structures that are to be spliced together. Make sure that the fronts are flush. This ensures proper alignment of all components.

Splice sections using the instructions in the Model 5 Instruction Bulletin (8998IM9101) if joining to a Model 5 MCC, or the instructions inSplice Gaskets for Type 1 Gasketed, Type 1 Sprinkler-Resistant, and Type 12 Enclosures of this instruction bulletin if joining to a Model 6 MCC. Use the 12 1/4–20 hex head screws provided in the kit to splice the corner channels of the existing MCC to the corner channels of the new MCC.

Re-attach the back plate (see Re-attaching the Back Plates) to the leftmost section of the MCC being added by using the 10–32 hex head screws removed in Step 4. Install the back bracket (see Installing the Splice Deflector) under the back plate using the right side holes of the back bracket. Ensure that the notch at the top of the back bracket is installed toward the new MCC section.

Using the hardware removed in Step 3, re-attach the back plate (see Re-attaching the Back Plates) to the rightmost section of the existing MCC.

Install the splice adaptor (see Installing the Splice Deflector) to the leftmost section of the MCC being added by using five 1/4–20 screws provided in the kit.

Next, position the end deflector, provided in the kit, over the top plate flanges of both sections (see Installing the Splice Deflector) and install with five 1/4–20 screws removed in Step 2.

Using six 10–32 hex head screws, provided in the kit, secure the right front vertical channel of the MCC being added to the right splice bracket installed in Step 7 (see Installing the Splice Deflector).

Before energizing the equipment, replace all covers and barriers.