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GEK-7 21
01,
Low
Y
oltage Swifchgeor
LOAD CENTER
UNIT
SUBSTATION
PRIMARY SECTIOI{
SI{IPPIIG
ilCKAGE
General
Electric
AKD-6 Low
Voltage
Switchgear
is
a
free-standing assembly
of
metal-enclosed
units
of
Power
Circuit
Breakers and other
auxiliary
power
circuit
protec-
tive
devices.
It
may
also
be
a part of a
single-ended
or
double-ended
Load
Center
Unit
Substation.
Figure
4
is
an outline
of a
side
view
of a typical unit
showing compartmentation, and
Figure
5
is an outline
of
a typical
single-ended
Load
Center
Unit
Substation
illus-
trating
the nomenclature
used
for all
equipment.
All
of the
switching and protective
devices,
control
and
metering
devices,
control fuses
and instrument
trans-
formers are mounted
in
the
enclosure.
The breaker positions
are
all
of
the
drawout type.
The breakers are
provided
with
self
-coupling
primary
and
secondary
disconnecting contacts
and incorporate
positive and indirect
interlocks
to
insure
proper
operating
sequence.
Each
of
the
individual
units,
compartments
and
devices
is
described
in
the
following
paragraphs.
LOW VOLTAGE SECTION
ol5
FRONT
ENCLOSURE
The
front
enclosure
of
each
unit is
divided
into
in-
dividual
compartments.
These
compartments either
house
a
power
circuit
breaker
or
are used
to
mount instruments
and other protective
devices
and control
components.
BREAKER
COMPARTMENTS_AK
BREAKERS_
MOUNTING
CODE
2A,
3A,
4A,
OR
5A
These
breakers are supported
within their
compartments
by
a
rollout track
which is
part
of the drawout
mechanism
attached
to
the
sides
of
the
compartment.
See
Figure
6.
The drawout
mechanism
is
shown
in
an
exploded
view,
Figure
19,
and
its
operation
is
explained
in
detail
under
"Drawout
Mechanism Operation,"
SHIPPING
PACKAGE
SHIPPING
PACKAGE
REAKER
UNITS
or3
FlG.
5
(0102C5207-O
Outline
of o
typicol
lood
Cenfer
Unit
Substqtion showing nomenclqture
DESCRIPTION
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