Splicing Offset or 3000/3200 A Horizontal Bus

• In all structures with an offset or 3000/3200 A horizontal bus, splice bars are provided as a kit. This kit is packaged in a carton and shipped inside the structure. The kit contains all splice bars and mounting hardware necessary for horizontal bus splicing.

• Use the splice kit only if splicing is to be done on the left (while facing the structure). If the splice is not on the left, remove the kit before energizing and retain it for future expansion. If a structure is to be spliced to another structure on the right, follow splicing instructions provided for that structure application.

• 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.

To splice a horizontal bus on the left side of the structure:

1. Position the rear splice bar (the bar with captive nuts; see Splice Offset Horizontal Bus) against the back face of the rear horizontal bus bar.

   Splice Offset Horizontal Bus

   

2. Install a plain splice bar between each lamination of horizontal bus; install the last bar against the front face of the horizontal bus (see Splice Offset Horizontal Bus).

3. Align the four mounting holes in the splice bus and the horizontal bus.

4. Install four splice bolts, two on each side of the splice assembly.

5. For 600–2500 A main bus splices, torque the bolts to 31-32 lb-ft. (41.87-43.22 N•m). For 3000/3200 A main bus splices, torque the bolts to 68–72 lb-ft. (92.2–97.6 N•m). Torque the center nut on 85 kA braced, 3R splice bar assemblies to 68–72 lb-ft. (92.2–97.6 N•m).

6. Repeat step 1 for all phases and the neutral bus (if supplied).