GE Industrial Solutions AKD-20 Low Voltage Switchgear - Manuel (Page 23)

AKD-20 Low Voltage Switchgear
Chapter 3. Description
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Insulated/Isolated Bus System
A bus insulation system, Fig. 3-20, that fully insulates and
isolates each phase of the horizontal main bus and isolates each
phase of the vertical bus, is optionally available for AKD-20
switchgear when specified. With the INSULATED/-ISOLATED BUS
system, there are no live connections accessible in the rear of
each section except the cable lugs.
1. Vertical riser bus covers
2. Run-backs to feeder cables
3. Horizontal main bus
4. Upper neutral bus with 4 th wire
Sensors
Fig. 3-20. Insulated/Isolated-Bus system
A vertical barrier (2), Fig. 3-21, between the transition section (1)
and the first breaker section is always furnished.
The buswork in the device/auxiliary/transition sections is not
insulated at the termination points to the other connected
equipments such as transformers, busway, or existing
equipment.
1. Transition compartment
2. Barrier
3. Main incoming bus
4. Neutral bus
5. Ground bus
Fig. 3-21. Transition section
1
2
3
4
1
3
2
4
5