Model 6 Motor Control Centers – Instruction Bulletin PDF
80459-641-01, Rev. 10

Splicing Power Bus for Type 1 and Type 12 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.

To splice the power bus:

  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 horizontal wireway covers and slide the horizontal bus barriers to gain access to the captive splice connectors (see Horizontal Wireway Covers and Bus Barriers Removed). See Appendix A—Removal and Installation of Horizontal Bus Barrier Panels for the steps for removing horizontal bus barriers.

Horizontal Wireway Covers and Bus Barriers Removed

Power Bus Splicing MCCs with Single Bar/Phase Splice Kit (600 A and 800 A, Copper Horizontal Bus, 65,000 A Short Circuit or Less, Shipped after August 2012)

NOTE: The integral splice kit used on shipments September 2012 and later, containing 600/800 A, copper, horizontal bus with a short circuit withstand current rating 65,000 A RMS consists of a single bar per phase and does not use a fork type bus (see Correct Application of Splice (shown installed) for 600/800 A, Non-fork Bus). DO NOT use the single bar per phase splice on the fork end of the fork type bus (see Incorrect Application of Single-Bar Splice on Fork-type Bus for incorrect application). Two splice bars must be used on the fork end of the fork type bus (see Power Bus Splicing MCCs with Multiple Bar/Phase Splice Kit). Contact your local Schneider Electric representative if the necessary two-bar splice is not provided with your equipment.

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.

Power Bus Splicing MCCs with Multiple Bar/Phase Splice Kit

NOTE: On the integral splice bar assembly, located on the left side of each phase bus, the number of splice bars used on each phase is one greater than the number of main horizontal bus bars. The rear-most splice bar includes captive nuts.

  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.

QR Code is a registered trademark of DENSO WAVE INCORPORATED in Japan and other countries.

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