627-500 2
INTRODUCTION
General The following instructions are for installation of manual or power-operated S&C PMX
Modular Metal-Enclosed Switchgear rated 13.8 kV or 25 kV.
An assembly of PMX Switchgear may incorporate many types of components, such as
interrupter switches, power fuses, switch operators, a source-transfer control, voltage
sensors, current sensors, meters, etc., depending on user requirements.
Instructions for operation of each S&C component are provided in a separate S&C
instruction sheet. For each switchgear assembly, the applicable instruction sheets, drawings,
and wiring diagrams are bound in a folder entitled “Instruction Manual.” This instruction
manual is located in a holder inside the appropriately marked switchgear-module door.
Qualified Persons ÇCAUTION
The equipment covered by this publication must be selected for a specific application
and it must be installed, operated, and maintained by qualified persons who are
thoroughly trained and who understand any hazards that may be involved. This
publication is written only for such qualified persons and is not intended to be a
substitute for adequate training and experience in safety procedures for this type of
equipment.
Each assembly of S&C PMX Modular Metal-Enclosed Switchgear is provided with an
“INSTALLATION AND OPERATION INFORMATION KIT” located in the holder inside the
switchgear-module door on which the label “Installation and Operation Information Kit
Inside This Bay” is affixed. The “INSTALLATION AND OPERATION INFORMATION KIT”
includes applicable instruction sheets covering installation of the switchgear assembly
and operation of components, plus drawings and wiring diagrams. All personnel involved
with installation and operation of the switchgear assembly should be thoroughly familiar
with the contents of the “INSTALLATION AND OPERATION INFORMATION KIT.”
This equipment has been provided with comprehensive access control and operating
features to minimize hazards. However, since this equipment contains high voltage,
there are hazards inherently present such that the following precautions should
be observed at all times. FAILURE TO OBSERVE THESE PRECAUTIONS MAY
RESULT IN SERIOUS INJURY OR DEATH.
1. Padlocks must be installed and secured on all door handles and manual switch
operating handles at all times unless a switch is being operated.
2. Snaplocks must be in place and the keys must be removed.
3. Key interlocks (if applicable) must be in place. Check the operating sequence of key
interlocks to verify proper sequencing. After the switchgear is installed, destroy all
duplicate keys or make them accessible only to authorized persons so that the key
interlock scheme will not be compromised. Key interlocks are not security locks.
4. Mechanical cable interlocks are provided to prevent access to fuses unless the switch
is open and to prevent operation of stored-energy switch operators when the module
door is open. Do not attempt to operate any switch when the enclosure door is open.
Periodically, verify that these interlocks are functional. Refer to the instructions
under “INTERLOCKS” on page 33.
5. Do not apply any undue force to any handle when attempting to open or close a door
or cover. The use of undue force may damage the handle or latching mechanism, or
an interlock mechanism may be jammed. Do not attempt to close doors in an effort to
reset interlocks. Instead, follow the instructions under “INTERLOCKS” on page 33.
