39
A K D - 20 A N D E NTE LLYS I S
LO W VO LTAG E S W I TC H G E A R
—
Fig. 4.13
Plan view of neutral
bus splice installation
—
Fig. 4.13
—
Fig. 4.14
—
Fig. 4.15
—
Fig. 4.14
Rear view of main bus
at a shipping split
—
Fig. 4.15
Plan view of a three bar
main bus connection
Neutral bus
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. 4.13 illustrates the
installation of the neutral splice plate.
Horizontal main bus
The installation of the horizontal bus splice bars
is with bolted joints. Figs. 4.14 and 4.15 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. 4.14 shows the rear view of the main busarea
with the installed splice plates indicated with
cross-hatching.
Fig. 4.15 shows that a spacer is used both between
the bus bars when more than one bar is used per
phase (normally the 2500 ampere and larger main
bus ratings).
After assembly of the splice bars and spacers, the
1/2-13 bolts should be tightened to a torque of
35-40 ft-lbs. After completing the installation of
the main bus splice bars, the joint covers may be
mounted and secured by a 3/8-16 nylon bolt and
polyester flat washer if the bus insulation option
has been supplied with the equipment.
