381333-395 Installation 1-1
Installation
The ASCO 7000 Series Medium-Voltage Automatic
Transfer Switch (ATS) is factory wired and tested.
Supporting Structure
The supporting foundation for the enclosure must be
level and straight. Refer to the applicable enclosure
outline drawing included with the transfer switch for
all mounting details including door opening space.
Mounting
Refer to the outline and mounting diagram and mount
the automatic transfer switch according to details and
instructions shown on the diagram.
Protect the transfer switch from construction grit and
metal chips to prevent malfunction or shortened life
of the transfer switch.
Testing Power Conductors
Do not connect the power conductors to the transfer
switch until they are tested. Installing power cables in
conduit, cable troughs, and ceiling-suspended hangers
often requires considerable force. The pulling of
cables can damage insulation and stretch or break the
conductor’s strands. For this reason, after the cables
are pulled into position, and before they are connected,
they should be tested to verify that they are not
defective or have been damaged during installation.
Line Connections
Refer to the wiring diagram provided with the transfer
switch. All wiring must be made in accordance with
the National Electrical Code and local codes.
De-energize all conductors, open all circuit
breakers, and rack out all voltage transformers
before making any connections. De-energize any
UPS, station battery system, or any similar
system providing standby control power. Be sure
that the Normal and Emergency line connections
are in proper phase rotation. Place the engine
generator starting control in the OFF position.
Make sure engine generator is not in operation.
Engine-Generator Control
Connections
All customer connections, including the engine control
contact connections, are located on terminal block TB.
This terminal block is located on the interior left side
of the control section. Refer to the wiring diagram
provided with the automatic transfer switch. Connect
the engine start wires to the appropriate terminals. See
Figure 1-1 and Table A.
Table A. Engine-generator control contacts
When normal source fails TB terminals
contact closes TB1 and TB2
contact opens TB1 and TB3
Auxiliary Circuits
Connect auxiliary circuit wires to appropriate
terminals on terminal block TB as shown on the wiring
diagram provided with the automatic transfer switch.
Figure 1-1. Customer terminal block TB in controls section.
Refer to the manual from the manufacturer of
the metal-clad switchgear for section handling,
installation, power connections, and testing.
engine-
generator
control
contacts
NOTIC
DANGER
!
1
2
3
