GE Industrial Solutions Entellisys Installation - Manual (Page 37)

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Entellisys Low Voltage Switchgear
Chapter 4. Equipment Installation
All bolted bus joints should be made using the proper torque
as shown in Table A-1 in Appendix A of this manual.
Transformers not manufactured by General Electric may
require special mounting and bus connection hardware.
The neutral bus may be insulated from the grounded frame of
the switchgear equipment; thus, it is mounted on insulators
throughout the equipment. Installation of the neutral bus
splice plate across a shipping split is similar to the ground
bar splice except that the splice plate is not bolted to the
equipment frame. Fig. 4-11 illustrates the installation of the
neutral splice plate.
Fig. 4-11. Plan view of neutral bus splice installation
The installation of the horizontal bus splice bars is with
bolted joints.
Figs. 4-12 and 4-13 illustrate the assembly of the main bus
splice plates on the bolted bus system. Copper bus systems
are normally supplied with flat washers and lock washers.
Fig. 4-12 shows the rear view of the main bus area with the
installed splice bus indicated with cross-hatching.
Fig. 4-13 shows that a spacer is used both between the
busbars when more than one bar is used per phase (normally
the 2500 ampere and larger main bus ratings) and over the
outer bars of a single or multiple bar joint.
After assembly of the splice plates and spacers, the 1/2-13
bolts should be tightened to a torque of 35-40 ft-lbs.
Fig. 4-12. Rear view of main bus at a shipping split
Fig. 4-13. Plan view of a two bar main bus connection