GE Industrial Solutions AKD-20 Low Voltage Switchgear - Manuel (Page 24)

AKD-20 Low Voltage Switchgear
Chapter 3. Description
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Insulation and isolation of the vertical riser bus bars (1), Fig. 3-23, is
provided by installing phase isolation barriers (not shown) between
the bus bars and by mounting covers (4) over the bus bars.
The phase isolation barriers and riser bus covers are constructed
from insulating material. Insulation of the horizontal main bus bars
(2) is achieved by an oven cured coating of epoxy.
The vertical/ horizontal bus bar joints are covered with collars (3)
and caps (4) held in place with nylon thumb screws (5). The collars
and caps are constructed from insulating material.
1. Molded base
2. Vertical riser buses (cover removed to show bus
location)
3. Vertical bus bracing.
4. Run In conductors.
5. Insulated run backs
Fig. 3-22. Bus system
Figure 3-22 illustrates the various components comprising the
vertical main bus bars (2). Bus bars are supported by molded or
machined barriers, (1). Vertical bus can be braced (3) depending on
the interrupting rating of the switchgear. Conductors that provide
current to the breaker compartments are called run in bars (4) and
are bolted to the riser bus bars. Insulated run back bars (5) are for
connecting load conductor cabling.
1. Vertical bus barrier
2. Insulated bus bar (epoxy coated)
3. Joint collars
4. Joint caps
5. Nylon thumb screws
Fig. 3-23. Insul-bar horizontal bus insulation system
3-11 Feeder Cable and Busway
Compartment
The rear cable and terminal compartment, Fig. 3-24, provides for
cable installation and terminations. The cable bending space meets
the requirements of the National Electric Code. Various
arrangements of single or double cable terminals are provided,
depending upon the purchaser's requirements.
When specified, racks for the support of feeder cables are located in
the cable compartment. The actual support of the cables is
provided by lashing them to these racks.
Also located in the cable compartments are provisions for
terminating control wires between external devices and control
circuits within the switchgear equipments. Figure 3-25 shows this
typical arrangement.
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