Page 362 - Industrial Power Engineering and Applications Handbook

Switchgear and controlgear assemblies 13/337

Figure 13.4 A non-compartmentalized distribution board

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term i n a I s

Figure 13.3 A typical cubicle-type fully compartmentalized
power distribution board (Courtesy: ECS)

are too small and which can be mounted on a wall or
fixed in a recess.
These assemblies may be further classified into single-
or double-front assemblies. In double-front, they may be
without a maintenance gallery as shown in Figure 13.7,
or in a duplex design, with a maintenance gallery between
the front and rear rows of panels to provide easy access
at the back of the feeders, as shown in Figure 13.8.
In the following text, although we have tried to cover
the types of switchgear assemblies mentioned above,
more details have been provided for assemblies that relate
to a power-generating station, an industry, or installations
where use of an electric drive is more common and may
require more care. The design of components and devices
mounted in a switchgear or a controlgear assembly is
beyond the scope of this book. The different types of HT
interrupting devices, particularly breakers, being more
intricate are, however, discussed in Chapter 19.

13.2.3 PLC-based control panels*

Conventional method to activate controls has been through

*PLC - Programmable logic controller (a registered trade mark of Figure 13.5 Atypical mimic-cum-process control panel (Courtesy:
Allen Bradley Co. Inc., USA). ECS)