Splicing Offset or 3000/3200 A Horizontal Bus (Left Side of Structure Only)

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. 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.

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.
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.

NOTE:

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, follow these steps:

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.
Join sections together following the appropriate steps beginning at Locating the MCC and continuing through Joining Type 3R Sections. This provides proper alignment of the horizontal bus.
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
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 ).
Align the four mounting holes in the splice bus and the horizontal bus.
Re-install the two left bolts through the splice assembly and into the horizontal bus. Make sure the original conical washers are re-installed with the concave side facing the splice bus (see Figure Place a Conical Washer Under the Bolt Head).

Place a Conical Washer Under the Bolt Head
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 70 lb-ft (94.92 N•m). Torque the center nut on 85 kA braced, 3R splice bar assemblies (see ) to 70 lb-ft (94.92 N•m).
Repeat Steps 2–6 for each of the three horizontal bus phases.
Before energizing the equipment, replace all covers and barriers.