Chapter 2 Installation And Operation 5
ASCO 7000 Series Medium Voltage Transfer Switch User Manual
2.1 Installation
The ASCO 7000 Series Medium-Voltage Automatic Transfer Switch (ATS) is factory wired and tested.
Refer to the manual from the manufacturer of the metal-clad switchgear for section handling, installation, power
connections, and testing.
2.1.1 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.
2.1.2 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.
2.1.3 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.
2.1.4 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.
2.1.5 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 2-1 and Table 2-1.
Table 2-1 Engine-generator control contacts
Figure 2-1 Customer terminal block TB in controls section
engine -generator
control
connections
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