Joining Type 1 / Type 1 Gasketed / Type 12 Sections

To mount and splice a new MCC section to an existing Model 6 section, or to join 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 top and bottom horizontal wireway covers in all sections, providing access to each section’s front splicing bolts.

3. Gain access to each section’s bus splicing provisions by removing the panels of the two-piece bus barriers in the sections adjacent to a splice connection (the left and right sections). See Removal and Installation of Horizontal Bus Barrier Panels.

4. Make provisions for fastening the structure(s) to the floor. Refer to MCC drawings (included with the MCC) for locations of anchor fasteners.

5. Supporting the MCC by its base channels and/or lifting angles, lift it into place. The front edges of the base channels must be aligned 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. Use caution when moving MCC sections, as they are top heavy. See Handling the MCC.

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 is 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 front and rear corner channels (see Joining Corner Channels , View A).

   Joining Corner Channels

   

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 halfcircle shaped notches and into the mating threadforming hole (see Joining Corner Channels, View B).

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

5. Tighten the screws (see Joining Corner Channels, View C).

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

   NOTE: In some instances, holes in the rear channels will only be accessible from the rear of the MCC with the MCC back plates removed. If the MCC is not rear accessible, install as many screws as possible from the front of the MCC (typically via the vertical wireway).

1. Locate two clearance holes for 1/4-20 hardware on the inside surface of the bottom section side channels (see Joining Section Side Channels, Views A and B). These can be accessed after removal of the bottom wireway cover.

   Joining Section Side Channels

   

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 Joining Section Side Channels, View A).

3. The screw installed at the rear is installed from the left-hand section (see Joining Section Side 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 Joining Section Side Channels, View C).

5. The rear clearance hole is in the right section. In most cases, it will be necessary to remove the section back plate or the top plate to gain access to the rear clearance hole and install the screw (see Joining Section Side Channels, View D).

Non-Seismic Applications

Each MCC section must be fastened to the floor (mounting surface) in two places using 1/2 in. or 3/4 in., grade five or higher, bolts, and flat washers (furnished by customer). 0.88 in. diameter base channel mounting holes provide clearance for 1/2 in. expansion anchors. Refer to MCC drawings (included with the MCC) for locations of anchor fasteners.

Seismic Hazard Seismic hazard for site specific locations as defined by the current edition of the International Building Code or NFPA 5000 or relevant local building code or consulting engineer of record.* Designated Locations

Each section must be anchored per detail supplied by engineer of record to the loadbearing path of the building structural system. 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. Refer to instruction bulletin 80459-641-01, Model 6 Motor Control Centers, for additional information on anchoring MCC sections.

Anchor Point Access for ArcBlok 1200 with Bottom-Feed, Line-Side, Isolation Cable Vault

The front cover and rear panel assembly of each ArcBlok bottomfeed cable vault are removable to allow access to section anchor points.

1. Remove and retain the 3/8-16 Keps nuts securing the cable vault front cover.

2. Remove the cable vault front cover.

3. Remove and retain the 3/8-16 Keps nuts securing the cable vault rear panel. The rear panel is accessible from inside the cable vault after the front cover is removed.

4. Remove the rear panel from the inside of the cable vault.

5. Install the anchor hardware.

6. Reinstall the rear panel and front cover using the 3/8-16 Keps nuts retained in steps 1 and 3.

Anchor Point Access for ArcBlok 2500 with Bottom-Feed, Line-Side, Isolation Cable Vault

The front cover and rear access panel of each ArcBlok bottom-feed cable vault are removable to allow access to section anchor points.

1. Unplug the terminal block of ArcBlok Event Indicator and put it on the right side of the cable vault. Do not disconnect wires from the terminal block.

2. Remove and retain the 1/4-20 hardware securing the cable vault front cover.

3. Remove and retain the cable vault front cover.

4. Remove and retain the 1/4-20 hardware securing the cable vault rear access panel.

5. Remove and retain the rear access panel from the inside of the cable vault.

   DANGER
   hazard of electric shock, explosion, or arc flash Replace all covers after section is anchored. Do not turn on power if the covers are uninstalled. Torque cover hardware to 95–105 lb-in. (10.7–11.9 N•m). Failure to follow these instructions will result in death or serious injury.

6. Install the anchor hardware.

7. Reinstall the rear access panel using 1/4-20 hardware retained in step 4. Torque hardware to 95–105 lb-in. (10.7–11.9 N•m).

8. Reinstall the cable vault front cover using 1/4-20 hardware retained in step 2 and 3.

9. Re-plug the terminal block of ArcBlok Event Indicator removed in step 1.

   Cable Vault Rear Access Panel

   

Seismic Hazard Designated Locations

When specified or required for the application (all seismic hazard areas with S_s in excess of 2.67 g), 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. (13 mm) On arc-rated MCCs, do not block roof flaps with lateral restraint components. 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. Refer to instruction bulletin 80459-641-01, Model 6 Motor Control Centers, for additional lifting angle attachment point information.

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

This section provides instructions for joining Type 3R MCC 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 right section back plate (see 3R Multi-Section Back Bracket).

   3R Multi-Section Back Bracket

   

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

4. 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 3R Multi-Section Back Bracket).

5. Install the mid deflector, ensuring both top plate flanges are covered (see Mid and End Deflectors).

   Mid and End Deflectors

   

6. 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

   

7. 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