Ground Bus Splicing for Type 1, Type 12, and Type 3R

NOTE: The MCC horizontal ground bus is located at the bottom of each MCC structure. It can be accessed by removing the bottom horizontal wireway cover or other bottom located cover on the structure. The ground bus splice plate is located on the right end of the ground bus in each shipping split.

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 ground 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 ground bar bolts from the right and left sections (see Ground Splice Bar as Shipped).

   Ground Splice Bar as Shipped

   

3. Slide the ground splice bar into the right section, aligning the mounting holes (see Ground Bar Bolt Replaced).

   Ground Bar Bolt Replaced

   

4. Replace the ground bar bolts (see Ground Bar Bolt Replaced) in the right and left sections. Torque both bolts to 60–75 lb-in. (6.75–8.44 N•m).

5. Replace all covers and barriers and close all doors.