Ground Bus Splicing for Bottom-Feed ArcBlok Main Sections

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-2011, or CSA Z462. 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, and follow your organization’s lockout/tagout procedures. 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, follow these steps:

1. Remove the cable vault front cover to access the ground bus assembly.

2. Remove the ground bar bolts in the cable vault and in the adjacent MCC section.

3. Slide the ground splice bar into the right section, aligning the mounting holes.

4. Replace the ground bar bolts (see Ground Bar Bolt Replaced) in the right and left sections.

5. Torque the ground bar bolts to 60–75 lb-in (6.75–8.44 N•m).

6. Place the ground closing plates into position to seal the cable vault (see Figure Location of Ground Closing Plates).

   1. Slide the left ground closing plate against the splice bus bar.

   2. Slide the right ground closing plate to completely close the splice opening on the cable vault panel.

7. Replace all covers and barriers, and close all doors.

   Location of Ground Closing Plates