S&C Source-Transfer PMH Pad-Mounted Gear
With Micro-AT
®
Control
Outdoor Distribution (14.4 kv and 25 kv)
S&C ELECTRIC COMPANY
s
663-503
INSTRUCTION SHEET
Page 2 of 35
August 14, 1995
INTRODUCTION
Qualified Persons
General
Each unit of S&C Source-Transfer PMH Pad-Mounted
Gear is provided with an “Installation and Operation
Information Kit” located in the holder inside the Penta-
Latch-equipped door of the low-voltage control compart-
ment. The information kit includes applicable instruction
sheets covering installation of the gear and operation of
components, plus wiring diagrams and a catalog dimen-
sional drawing showing cable-locating and anchor-bolt
dimensions. All personnel involved with installation and
operation of the gear should be thoroughly familiar with
the contents of the kit.
These instructions are for operation of fuses and Mini-
Rupter Switches in S&C Pad-Mounted Gear, Source-Trans-
fer PMH Models equipped with the S&C Micro-AT Source-
Ç
WARNING
The equipment covered by this publication must be in-
stalled, operated, and maintained by qualified persons
who are knowledgeable in the installation, operation,
and maintenance of underground electric power distri-
bution equipment along with the associated hazards. A
qualified person is one who is trained and competent in:
•
The skills and techniques necessary to distinguish
exposed live parts from non-live parts of electrical
equipment.
•
The skills and techniques necessary to determine
the proper approach distances corresponding to the
voltages to which the qualified person will be
exposed.
•
The proper use of the special precautionary tech-
niques, personal protective equipment, insulating
and shielding materials, and insulated tools for
working on or near exposed energized parts of elec-
trical equipment.
These instructions are intended only for such quali-
fied persons. They are
not
intended to be a substitute
for adequate training and experience in safety proce-
dures for this type of equipment.
Ç
CAUTION
The equipment in this publication must be selected for a
specific application. The application must be within the
ratings furnished for the equipment. Ratings for this gear
are listed on a ratings label on the interior of the doors
(right-hand doors only for double-door models).
Transfer Control. For instructions regarding field pro-
gramming and operation of the Micro-AT control, refer to
S&C Instruction Sheet 515-500.
Source-Transfer PMH Pad-Mounted Gear is a totally
self-contained switching and protection package that pro-
vides fault protection and fully automatic two-way source
transfer for critical loads requiring a high degree of ser-
vice continuity. This gear contains the following:
•
Switch-operator-driven 600-ampere S&C Mini-Rupter
Switches for three-pole live switching of three-phase
source circuits.
•
Stored-energy operators to provide high-speed power
operation of the Mini-Rupter Switches. The operators
automatically charge when voltage is present on the
associated source.
•
S&C Micro-AT Source-Transfer Control for pro-
grammed control of all switching functions associated
with automatic source transfer.
•
S&C Voltage Sensors to provide three-phase sensing
for automatic source transfer and control power for
the Micro-AT control. The voltage sensors also provide
supply power for motor charging of the stored-energy
operators and capacitor charging for solenoid tripping
of the operators.
•
Decouplers to permit exercising of the stored-energy
operators without affecting the position of the Mini-
Rupter Switches.
•
200- or 400-ampere hookstick-operated S&C Power
Fuses with Uni-Rupter for single-pole live switching of
single-phase or three-phase load circuits. Models avail-
able offer a choice of S&C Type SML-20 or SML-4Z
Power Fuses, S&C Fault Fiter
®
Electronic Power
Fuses, or a variety of current-limiting fuses.
•
Penta-Latch Mechanism on each set of doors for
access control. Mechanism provides automatic door
latching and permits padlocking only when the door is
latched closed. Doors can be opened only with a penta-
head socket wrench or tool except when hexhead actu-
ators (Catalog Number Suffix “-B1” or “-B2”) are
specified.
A variety of optional features are available for S&C
Source-Transfer PMH Pad-Mounted Gear. The catalog
number stamped on the nameplate affixed to the enclo-
sure door is suffixed with letter-number combinations
applicable to the gear furnished. Refer to Appendix D for
descriptions of the optional features.
