Installing the MCC

Install MCCs in an area with a minimum of 3 ft. (0.9 m) of free space in front of front-of-board construction. An additional 3 ft. (0.9 m) is necessary in the rear of back-to-back construction. This free space provides adequate room to remove and install units. (More space may be required for some applications; refer to applicable local and national installation codes.) Provide at least 0.5 in. (13 mm) of space between the back of front-of-board MCCs and a wall. For damp locations, provide at least 6 in. (152 mm).

When selecting a location for the installation of an MCC, carefully consider accessibility, overhead clearances, and future expansions. Considering these factors minimizes many difficulties during this and future MCC installations.

DANGER
Burn hazard from HOT GASES Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, CSA Z462, or local equivalent. Keep the area directly above the equipment clear and unobstructed for 28.5 in. (724 mm) from the roof. Failure to follow these instructions will result in death or serious injury.

The shaded area (see Required Obstruction-Free Area) above the arc-rated MCC must be free from obstructions.

Required Obstruction-Free Area

Provide a smooth, level surface for installation. An uneven foundation may cause misalignment of shipping blocks, units, and doors. The surface under an MCC must be of a non-combustible material unless bottom plates are installed in each vertical section.

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).

Model 6 Motor Control Centers that are seismically certified have been certified to the seismic requirements of the listed regional building codes and/or seismic design standards per the manufacturer’s certificate of compliance (CoC). Equipment labels and CoCs are provided with all seismically certified Model 6 Motor Control Centers. Refer to the equipment CoC for certification details and applicable seismic parameters. To maintain the validity of this certification, the installation instructions provided in this section must be followed.

Model 6 MCCs are considered nonstructural building components, as defined by regional building codes and seismic design standards. Equipment capacity was determined from tri-axial seismic shake table test results in accordance with the International Code Counsel Evaluation Service (ICC ES) Acceptance Criteria for Seismic Certification by Shake-TableTesting of Nonstructural Components (AC156).

An equipment importance factor, I_p, that is greater than one (I_p > 1.0) is assumed and indicates that equipment functionality is required after a seismic event and after seismic simulation testing. This importance factor is applicable for designated seismic systems, for example, special certification, servicing critical infrastructure where post- earthquake equipment functionality is a requirement.

Incoming and outgoing bus, cable, and conduit must also be considered as related, but independent, systems. These distribution systems must be designed and restrained to withstand the forces generated by the seismic event without increasing the load transferred to the equipment. For applications where seismic hazard exists, it is preferable for bus, cable, and conduit to enter and exit the bottom of the equipment enclosure.

Seismic qualification of nonstructural components and equipment by Schneider Electric is just one link in the total chain of responsibility required to maximize the probability that the equipment is intact and functional after a seismic event. During a seismic event, the equipment must be able to transfer the inertial loads that are created and reacted through the equipment’s force resisting system and anchorage to the load-bearing path of the building structural system or foundation.

Anchorage of equipment, for example, nonstructural supports and attachments, to the primary building structure or foundation is required to validate seismic conformance. The construction site structural engineer or registered design professional or engineer of record (EOR) is responsible for detailing the equipment anchorage requirements for the given installation. The installer and manufacturers of the anchorage system are responsible for assuring the mounting requirements are met. Schneider Electric is not responsible for the specification and performance of anchorage systems.

The equipment enclosure provides anchorage tie-down points to accept anchor attachments to the building structure or foundation. Model 6 MCC indoor enclosures provide enclosure base frame clearance holes for bolted anchorage attachments, as shown in Type 1, Type 1 Gasketed, Type 1 Sprinkler Resistant, and Type 12 Seismic Tie Down Locations and Seismic Tie-Down Locations for 18-Pulse AC Drive MCC Sections. Model 6 MCC outdoor enclosures provide enclosure base frame clearance holes for bolted anchorage attachments, as shown in Type 3R Seismic Tie-Down Locations.

MCC sections must be anchored using all enclosure tie-down points, as shown in the previous referenced topics, for indoor and outdoor applications.

The bolted anchor assembly view depicted in Bolted Anchor Assembly illustrates the equipment’s as-tested attachment to a seismic shake-table test fixture. The equipment seismic capacity, as stated on the Schneider Electric CoC, was achieved with the identified size and grade attachment hardware. For bolted attachments, the use of factory-supplied Belleville conical spring washers at specified locations is required to maintain seismic conformance. Field installed equipment attachment and support detailing must be in accordance with the anchorage system requirements as defined by the construction site structural engineer, registered design professional, or engineer of record.

Bolted Anchor Assembly

Equipment installations using welded supports and attachments in lieu of bolted supports and attachments must ensure the weld locations are distributed similarly to the locations of enclosure anchorage clearance holes. Welded supports and attachments must be properly sized to ensure the weldment withstand capacity exceeds the earthquake demand at the equipment installation location. Precautions must be taken to properly vent and shield the equipment enclosure during the field welding process. Paint must be removed from the equipment weld locations before welding, and then replaced after welding is complete to inhibit corrosion.

Each section must be anchored per detail supplied by engineer of record to the load bearing path of the building structural system. For floor mounting locations, see Type 1, Type 1 Gasketed, Type 1 Sprinkler Resistant, and Type 12 Seismic Tie Down Locations or Seismic Tie-Down Locations for 18-Pulse AC Drive MCC Sections. Use anchorage designed by and supplied by others. Seismic test units were anchored with 1/2-13 SAE Grade 5 hardware and Belleville conical washers. 1/2 in. and 3/4 in. Belleville washers are supplied with equipment for use with the seismic anchorage.

When specified or required for the application (all seismic hazard areas with S_s in excess of 2.67g), each section must be laterally braced at the top (bracing supplied by others) and connected to the load-bearing path of the building system per detail supplied by engineer of record. Refer to the current International Building Code or NFPA 5000 for location specific values of S_s.

DANGER
Hazard of electric shock, explosion, or arc flash Turn off power supplying equipment before installing lateral bracing. Bolts must not penetrate top plate by more than 0.50 in. (12.7 mm). Failure to follow these instructions will result in death or serious injury.

Remove the lifting angle and fasten each section to the lateral restraint system (supplied by others) using the same attachment points used to secure the lifting angle. Re-use bolts and lock washer supplied with the lifting angle or hardware supplied by others as appropriate. Pay particular attention to the limitation on the depth the bolt can penetrate below the surface of the top plate. The bolts must not penetrate the top plate of the enclosure by more than 0.50 in.

Each section must also be anchored at the base. See the instruction label located on the inside of the bottom horizontal wireway cover.

NOTE: On arc-rated MCCs, do not block roof flaps with lateral restraint components.

Attachment Locations for Top Lateral Bracing NOTE: The dimensions shown are for locating top lateral bracing locations within individual MCC sections. Refer to factory supplied drawings to determine appropriate anchor locations for the top lateral brace support system.
15 (381) Section Dimensions Letter Section Width Dimension A N/A 5.25 (133) B N/A 15.00 (381) C 20.00 (508) 18.40 (467) 25.00 (635) 23.40 (594) 30.00 (762) 28.40 (721) 35.00 (889) 33.40 (848) D N/A 0.80 (20) N/A = Not applicable	20 (508) Section Dimensions Letter Section Width Dimension A (single lifting angle) N/A 10.25 (260) A (two lifting angles) N/A 1.91 (48) B N/A 20.00 (508) C 20.00 (508) 18.40 (467) 25.00 (635) 23.40 (594) 30.00 (762) 28.40 (721) 35.00 (889) 33.40 (848) D N/A 0.80 (20) N/A = Not applicable

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 plate and all flat gaskets from the existing MCC. Leave the P gasket on the existing front corner channel in place.

3. Remove the factory installed flat gasket from the front corner channel of the new vertical section.

4. Join sections together following the appropriate steps in Joining Type 1, Type 1 Gasketed, and Type 12 Sections or Joining Type 1 Sprinkler-resistant Sections.

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 plate and all flat gaskets from the existing MCC. Leave the P gasket on the existing front corner channel in place.

3. Remove the white paper backing from the new gaskets (supplied by Schneider Electric) to expose the adhesive. This adhesive temporarily holds the gasket in place while the sections are being positioned.

4. Apply a flat gasket to the outside of the rear vertical corner channel of the existing section. The gasket must not extend above the top of the corner channel.

5. Apply flat gaskets to the outside of the top and bottom side channels. The gaskets must not extend above the top of the side channels.

6. Applying thumb pressure, firmly press the gasket in place from top to bottom. The gasket must be flat along the entire length.

7. Join sections together following the appropriate steps in Joining Type 1, Type 1 Gasketed, and Type 12 Sections or Joining Type 1 Sprinkler-resistant Sections.

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.

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.

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

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

   

Correct Application of Splice (shown installed) for 600/800 A, Non-fork Bus

Incorrect Application of Single-Bar Splice on Fork-type Bus

1. Remove all four bolts from the integral splice bar (see Remove Bolts from Single-splice Bar).

   Remove Bolts from Single-splice Bar

   

2. Move the single splice bar to the left and align the two left holes in the splice bar with the corresponding holes in the horizontal bus on the left section (see Move and Align the Splice Bar to the Bus Holes).

   Move and Align the Splice Bar to the Bus Holes

   

3. Reinstall the four bolts into the horizontal bus on the left and right sections (see Insert Splice Bolts in the Left and Right Sections). Make sure the original conical washers are reinstalled with the concave side facing the horizontal bus (see Place a Conical Washer Under the Bolt Head).

   Insert Splice Bolts in the Left and Right Sections

   

   Place a Conical Washer Under the Bolt Head

   

4. Torque all bolts on both ends to 31–32 lb-ft. (41.87–43.22 N•m). (See Torquing the Bolts).

   Torquing the Bolts

   

5. Return to step 2 in Splicing Power Bus for Type 1 and Type 12 Enclosures for all phases and for the neutral bus (if supplied). When all splices are complete, go to step 6.

6. Before energizing the equipment, slide the horizontal bus barriers into the closed position and replace all covers.

1. Remove the two left bolts. Loosen, but do not remove, the two right bolts on the splice assembly (see Remove the Left Bolts and Loosen the Right Bolts on the Splice Assembly).

   NOTE: Do not remove the two right bolts from the splice assemblies. Doing so permits spacers to fall from the splice assembly. If this occurs, re-assemble the splice bars and spacers (if applicable) in the proper order before continuing.

   Remove the Left Bolts and Loosen the Right Bolts on the Splice Assembly

   

2. Slide the splice assembly to the left until the two left holes are in line with the corresponding holes in the horizontal bus on the left section (see Align the Splice and Bus Holes).

   Align the Splice and Bus Holes

   

3. Reinstall the two left bolts through the splice bars and into the horizontal bus (see Insert the Splice Bolts); make sure the original conical washers are reinstalled with the concave side facing the splice bus (see Place a Conical Washer Under the Bolt Head).

   Insert the Splice Bolts

   

   Place a Conical Washer Under the Bolt Head

   

4. Torque all bolts on both ends to 31–32 lb-ft. (41.87–43.22 N•m) (see Torque the Bolts).

   Torque the Bolts

   

5. Return to step 2 in for all phases and for the neutral bus (if supplied). When all splices are complete, go to step 6.

6. Before energizing the equipment, slide the horizontal bus barriers into the closed position and replace all covers.

Conduit entry into main breaker sections equipped with ArcBlok and line-side Isolation cable vaults requires:

• Use of an 18 in. pull box for top-feed entry with a removable top plate.

• Line-side isolation cable vaults require removal of enclosure covers and barriers prior to removing the cable vault front cover and ArcBlok lug cover.

Line-side Isolation Cable Vault and ArcBlok Top-feed Main Breaker Access

Line-side Isolation Cable Vault and ArcBlok Top-feed Main Lug Breaker Access

Line-side Isolation Cable Vault and ArcBlok Bottom-feed Main Breaker Access

Line-side Isolation Cable Vault and ArcBlok Bottom-feed Main Lug Breaker Access

Line-side Isolation Cable Vault Conduit Installation and Sealing

• Arcblok 2500 is only available in bottom-feed MCC units.

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 3/8 in. (9.525 mm) bolts, washers, and the lifting angle (see Remove the Hardware).

   Remove the Hardware

   

3. Remove the 10-32 screws that secure the top closing plate to the top of the cabinet (see Remove the Hardware).

4. Remove the top closing plate from the structure.

5. Remove the front panel from the pull box. Position the pull box on top of the cabinet as shown in Install the Pull Box.

   Install the Pull Box

   

6. Install the two 3/8 in. (9.525 mm) bolts and washers that were removed in step 2. Place them through the pull box lower side channels and into the top of the cabinet. Torque the bolts to 28–33 lb-in. (3.164–3.729 N•m).

7. Re-install the pull box front panel removed in step 5 and the top closing plate removed in step 4 (see Install the Pull Box).

1. Follow the same instructions for standard pull box installation (see Standard Low Voltage MCC Pull Box), except remove and discard the top closing plate from the MCC section. The vented pull box comes with a solid top plate.

   Install the Pull Box

   

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 3/8 in. (9.5 mm) bolts, washers, and the lifting angle (see Remove the Hardware).

   Remove the Hardware

   

3. Remove the 10–32 in. (4.8 mm) screws and vented hood (see Remove the Hardware).

4. Remove the 10–32 in (4.8 mm) screws and horizontal cross bus front cover (see Remove the Hardware).

5. Remove the pull box front cover for installation access (see Install the Pull Box).

   Install the Pull Box

   

6. Install 1/2 in. (12.7 mm) bolts and washers from inside the cabinet through the top closing plate and to the front pull box channel. Complete the connection with a washer and nut on the inside of the pull box.

7. Install two 1 /4 in (6.4 mm) screws on the pull box rear channel and to the top closing plate.

8. Install the two 3/8 in. (9.5 mm) bolts and washers that were removed in step 2. Place them through the lower side flanges of the vented hood, and into the top of the cabinet. Torque the bolts to 28–33 lb-in. (3.164–3.729 N•m).

9. Re-install the pull box front cover removed in step 5 (see Install the Pull Box) and the top horizontal wireway cover removed in step 4.

Refer to Removing the Lifting Angles and Hardware for the following steps.

Removing the Lifting Angles and Hardware

1. Uninstall and discard the lifting angles (A) by removing the 3/8 in. bolts and washers (B) securing them.

2. Remove and discard the top closing plate (C) from the MCC section by removing the 10-32 screws (D) securing it.

   NOTE: For main sections with ArcBlok 1200 technology, do not remove the top closing plate (C) since the pull box is installed over it. Remove only the 10-32 screws (D).

   Refer to Installing the Pull Box.

   Installing the Pull Box

   

3. Remove the front panel (E) from the pull box (F) by removing the 10-32 screws (G) securing it.

4. Position the pull box on top of the MCC section frame (for standard sections) or on top of the closing plate (for main sections with ArcBlok 1200 technology).

   NOTE: The overhang located at the top of the pull box must be facing the front of the MCC section.

5. Install the two 3/8 in. bolts and washers (B) removed in step 1. Place them through the pull box lower side channels and into the top of the MCC section.

6. Re-install the pull box front panel removed in step 3.

7. Remove the two 10-32 screws (H) located on the side of the pull box near the bottom.

8. Remove the two 10-32 screws, 3/8 in. bolt, and washer located on the top closing plate of the adjacent MCC section (I).

9. Install the pull box splice angle (J) re-using the hardware removed in steps 7 and 8.