Ground Bus Splicing

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.

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

   Ground Bar Bolt Replaced

   

4. Replace the ground bar bolts (see ) 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.

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 Location of Ground Closing Plates). Slide the closing plates against the ground bar where the bar passes into the next section. Where there is not a splice to an adjacent section, completely cover the unused ground bus opening with the closing plate.

   Location of Ground Closing Plates

   

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

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

2. For splicing to left adjacent section (if applicable):

   • Remove the bolts for the ground splice bar located on the left-side of the cable vault and the ground splice bar located on the right-side of the left adjacent section. (see Removing Bolts for Ground Splice Bar).

     Removing Bolts for Ground Splice Bar

     

   • Discard the ground splice bar on the right side of the left adjacent section.

   • Loosen the ground closing plate hardware on the left side of the cable vault and slide the closing plate forward to reveal open slot in cable vault.

   • Slide the ground splice bar located inside the cable vault to the left so that it aligns with the mounting hole of the ground bus in the left adjacent section.

   • Re-install one ground splice bar bolt in both sections, (see Re-install Ground Splice Bar Bolt).

     Re-install Ground Splice Bar Bolt

     

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

   • Slide the closing plate against the ground splice bar and tighten the ground closing plate hardware.

3. For splicing to right adjacent section (if applicable):

   • Remove the bolts for the ground splice bar located on the right-side of the cable vault.

   • If applicable, remove the bolts for the ground splice bar located on the left-side of the right adjacent section and discard the ground splice bar.

   • Loosen the ground closing plate hardware on the right side of the cable vault and slide the closing plate forward to reveal open slot in cable vault.

   • Slide the ground splice bar located inside the cable vault to the right so that it aligns with the mounting hole of the ground bus in the right adjacent section.

   • Re-install one ground splice bar bolt in both sections.

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

   • Slide the closing plate against the ground splice bar and tighten the ground closing plate hardware.

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