6 S&C Instruction Sheet 682-510
Components
Overview of Components
Remote Supervisory Vista Underground Distribution
Switchgear features load-interrupter switches for
switching 600-ampere main feeders; microprocessor-
controlled, resettable, vacuum fault interrupters for
switching and protection of 600-ampere main feeders;
and 200-ampere taps, laterals, and subloops. These elbow-
connected components are enclosed in a submersible,
SF
6
-insulated, welded-steel tank.
The three-position (CLOSED/OPEN/GROUNDED) load-
interrupter switches are manually operated and provide
three-pole live switching of 600-ampere three-phase
circuits. These switches also provide a visible gap when
open and internal grounding for all three phases. When
they are fitted with motor operators and controls, these
switches can be electrically oper ated via local operation
pushbuttons. The user may also control the motor opera-
tors for the load-interrupter switches remotely when a
remote termi nal unit (RTU) and communication device
are integrated with the remote supervisory Vista motor
operators and controls.
The 200-ampere and 600-ampere fault interrupters fea-
ture resettable vacuum interrupters in series with manu-
ally operated three-position (CLOSED/OPEN/GROUNDED)
disconnects for isolation and internal ground ing of each
phase. Fault interrupters provide single-pole or three-
pole fault interruption and manual single-pole (standard)
or three-pole (optional) live switching of load circuits.
Fault interruption is initiated by a programmable over-
current control. Conversion from single-pole trip con-
trol to three-pole trip control is accomplished using a
personal computer. See S&C Instruc tion Sheet 681-515
for instructions on programming the control. The
three-pole fault interrupters may be fitted with motor
operators and con trols so they may be electrically operated
via local operation pushbut tons. The user may also control
the motor operators for the three-pole fault interrupters
remotely when an RTU and a communi cation device are
integrated with the remote supervisory Vista motor opera-
tor and controls.
When the optional voltage indicator (option suffix “-L1”
or “-L2”) is spec ified, all routine operating tasks—switch-
ing, voltage testing, and ground ing—can be accomplished
by a single person without cable handling or exposure to
high voltage. Cable testing for faults can be performed
through the back of a user-supplied elbow with an insert
or feedthru bushing insert, eliminating the need for cable
handling or parking stands. Refer to Figures 1 through 7
for the location of components.
Figure 3. Wet-vault and UnderCover™
Style gear low-voltage enclosure.
Mounting brackets for mounting
enclosure to a wall or on a post
S&C’s Ultradur® II Outdoor Finish
Figure 2. Dry-vault-mounted style
gear low-voltage enclo sure.
Operation compartment
Termination
compartment
Low-voltage
compartment
Removable panel for
access to viewing
windows and operating
mechanisms
Padlockable hinged roofs for access to
operation and termination compartments
Figure 1. Pad-mounted style gear.
Pentahead bolt
