—
General information and system description
1. General information and system
description
1.1. System overview
The MNS-SG switchgear consists of one or more vertical
metal cabinets referred to as “sections.” Each
section
includes three separate compartments: device,
busbar and
cable compartment.
Each section contains up to four compartment locations
that may contain breakers, instruments and/or empty
compartments that are used to control, protect and
isolate
electrical equipment.
All sections include a top and a bottom horizontal
wireway
for control wiring.
Units feature front, hinged doors held closed by one or
more latches.
The rear door is secured by a swing handle with a door-
lock
mechanism that secures the door at four points of
contact.
The unit door is interlocked with the disconnecting means,
preventing the door from being opened when the breaker is
in the ON position. The unit door can only
be opened when
the breaker is in the OFF position.
A continuous horizontal bus, rated 1,600 to 5,000 amps,
distributes incoming power to all switchgear sections. The
horizontal bus is located in the bottom half of each
section,
and for tie applications a similar assembly is used at the top
of the section. Each section may contain
a system of vertical
bus, rated 1,600A up to 5,000A. The vertical bus is located in
the busbar compartment,
segregated from the device
compartment.
1.2. Component names
This manual uses the following naming conventions:
Blank unit: An empty compartment.
Compartment: Sections are typically divided into three
compartments: Device, busbar and cable.
See Mechanical Design - Section Arrangement.
Cubicle: See section.
Device: An instrument compartment, breaker compartment,
empty compartment or an equipped
space feeder.
Equipped space feeder: An empty compartment with the
cradle and pilot light, control and other wiring
already in
place, ready for the addition of a breaker.
Lineup: The arrangement of several vertical sections,
joined
side-by-side, to create a complete switchgear
with a
continuous horizontal bus.
Mimic bus: Consists of a series of electrical symbols
and
designations used on the exterior of large switchgear panels
that mimic the wiring scheme within
the panel.
Module: The equipment compartment within a section is
sometimes divided into smaller modules to accommodate
devices of different heights. One section
may be divided into
as many as four modules.
Section: An enclosed, vertical metal cabinet that
contains
devices, wireways and other internal constructions. Several
sections are typically combined
next to one another to form a
switchgear lineup.
Shipping split: Up to three vertical sections are arranged and
joined side-by-side at the factory. This
facilitates shipping,
handling and installation. A lineup may include more than one
shipping split depending on
the configuration.
Vertical Section: See Section.
To Next Page
Loading...
