80459-641-01, Rev. 10

Joining New Style Type 3R Enclosures to Old Style Type 3R Enclosures

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 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.

This section provides instructions for joining new style Type 3R enclosures manufactured after February 1998 to old style 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.

For all MCCs in 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 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 Type 3R MCC Enclosure

Removing the End Deflector

  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 Removing the End Deflector) 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 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 Removing the End Deflector) 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 Removing the Insulating Barrier) 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.

    Removing the Insulating Barrier

  6. Install the deflector bracket (see Installing the Deflector Bracket) on the right most section of the MCC being added using two 8-32 Phillips head screws included in the kit. The same holes from which the rivets were removed are used to mount the deflector bracket. The top holes of the bracket must align with the holes in the top plate of the enclosure.

    Installing the Deflector Bracket

  7. Attach a left splice bracket (see Installing the Deflector Bracket), 90 in. (2286 mm) long, to the front corner channel of the right most section of the MCC being added using six
    1/4–20 screws contained in the kit. The short flange must be flush with the front of the corner channel and that the holes in the bracket line up with the holes in the corner channel.

  8. Install a left splice bracket (see Installing the Deflector Bracket), 90 in. (2286 mm) long, to the rear corner channel of the right most section of the MCC being added using six
    1/4–20 screws contained in the kit. The short flange must be flush with the back of the corner channel and that the holes in the bracket line up with the holes in the corner channel.

  9. Attach a right splice bracket (see Installing the Deflector Bracket), 94 in. (2388 mm) long, to the left splice bracket installed in step 7 using six 10–32 flat Phillips head screws contained in the kit. The short flange must be behind the flange of the left splice bracket. The right splice bracket extends below the left splice bracket by approximately one in. (25 mm) when properly installed.

  10. Install a right splice bracket (see Installing the Deflector Bracket), 94 in. (2388 mm) long, to the left splice bracket installed in step 8 using six 10–32 flat Phillips head screws contained in the kit. The short flange must be in front of the flange of the left splice bracket. The right splice bracket extends below the left splice bracket by approximately one in. (25 mm) when properly installed.

  11. Position the structures that are to be spliced. Check that the fronts are flush to ensure proper alignment of all components.

  12. Splice sections using the instructions in the Model 5 Instruction Bulletin (8998IM9101) if joining to a Model 5 MCC, or the instructions in Splice Gaskets for Type 1 Gasketed, Type 1 Sprinkler-resistant, and Type 12 Enclosures if joining to a Model 6 MCC.

    NOTE: When splicing the horizontal bus between the new and existing MCC sections, remove the splice bars contained in the leftmost section of the existing MCC. Discard the splice bars. Install the horizontal bus splice assembly provided in this kit using the instructions beginning in Splicing Power Bus for Type 1 and Type 12 Enclosures. Use the remaining six 1/4–20 hex head screws provided in the kit to splice the corner channels of the existing MCC to the right splice brackets installed in steps 9 and 10.

    Re-attaching the Back Plates

  13. Using the 10–32 hex head screws removed in step 3, re-attach the back plate (see Re-attaching the Back Plates) to the rightmost section of the new MCC. Install the back bracket (see Installing the Deflector Bracket) under the back plate using the left side holes of the back bracket. The notch at the top of the back bracket must be installed toward the new MCC section.

  14. Using the 10–32 screws removed in step 3, re-attach the back plate (see Re-attaching the Back Plates) to the right section.

  15. Install the splice deflector (see Installing the Deflector Bracket) to the rightmost section of the MCC being added. Use the five 1/4–20 screws supplied in the kit. Both the top plate flanges must be covered.

  16. Install five of the 1/4–20 screws removed in step 2 through the splice deflector and into the top plate of the leftmost section of the existing MCC.

  17. Using the six 10–32 screws supplied in the kit, secure the right front vertical channel of the new Type 3R enclosure to the left front vertical channel of the existing Type 3R enclosure.

    NOTE: Install the screws through the clearance holes in the left front vertical channel of the existing MCC into the right front vertical channel of the new MCC.
  18. Before energizing the equipment, replace all covers and barriers.

Joining to the Right Side of an Existing 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 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.

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

  4. 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.

  5. 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.

    NOTE: Ensure that rivet parts do not fall into the MCC.
  6. 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 mounts 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 is flush with the bottom of the vertical channel.

    Installing the Splice Deflector

  7. 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. The short flange of the right splice bracket must be in front of the flange of the left splice bracket. When properly installed, the left splice bracket extends approximately one in. (25 mm) below the right splice bracket.

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

  9. Splice sections using the instructions in the Model 5 Instruction Bulletin (8998IM9101) if joining to a Model 5 MCC, or the instructions in Splice Gaskets for Type 1 Gasketed, Type 1 Sprinkler-resistant, and Type 12 Enclosures 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.

  10. 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. The notch at the top of the back bracket must be installed toward the new MCC section.

  11. 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.

  12. 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.

  13. 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.

  14. 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).

  15. Before energizing the equipment, replace all covers and barriers.

Joining Type 3R Sections

This section provides instructions for joining Type 3R MCC sections (manufactured after February 1998).

NOTE: All Type 3R sections manufactured after February 1998 are approximately 93 in. (2362 mm) from the bottom of the section to the top of the deflector.
  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 right section back plate (see Attach the Multi-Section Bracket).

    NOTE: Steps 3 and 4 apply only if a new section is being added to an existing MCC line-up. If installing a new line-up, skip to step 5.

    Attach the Multi-Section Bracket

  3. Remove the end deflector cap from the right side of the existing Type 3R section (seeRemove Mid and End-deflector Caps from the Top of the MCC). Also, remove the mid-deflector cap from the section being added to the right.

    Remove Mid and End-deflector Caps from the Top of the MCC

  4. Remove the end closing plate from the right side of the existing section.

  5. After placing the structures side-by-side, join them as described in Joining Type 1, Type 1 Gasketed, and Type 12 Sections.

  6. Re-attach the back plate (removed in step 2) to the right section using the additional hardware supplied. Attach the right side to the multi-section bracket (see Attach the Multi-Section Bracket).

  7. Install the mid deflector, ensuring both top plate flanges are covered (see Remove Mid and End-deflector Caps from the Top of the MCC).

  8. Using the six 10-32 screws supplied, secure the left front vertical channel of the Type 3R extension to the right front vertical channel of the Type 3R extension (see Secure the Vertical Channels).

    Secure the Vertical Channels

  9. If the lifting angle is to be removed from the sections after installation, replace all hardware in the order shown (see Replace Lifting Angle Hardware).

    Replace Lifting Angle Hardware

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