Product Manual

TP-6946 3/1616 Section 2 Installation
2.4 Set Overcurrent Protection
For models with integral overcurrent protection, the
overcurrent protection must be set prior to operation.
The equipment is shipped from the factory with a
long-time current setting of 100% (of the equipment
rating) and maximum short-time/ instantaneous current
and time delay settings.
Note: Do not energize this equipment until device
settings have been verified to ensure proper
system protection and coordination.
Refer to information supplied with the transfer switch for
adjustment procedures on the power switching unit’s
overcurrent protection trip unit.
Refer to Section 6.1.2, Overcurrent Trip, for additional
information on operation of the transfer switch following
an overcurrent trip condition.
2.5 Installation
NOTICE
Foreign material contamination. Cover the transfer switch
during installation to keep dirt, grit, metal drill chips, and other
debris out of the components. Cover the solenoid mechanism
during installation. After installation, use the manual operating
handle to cycle the contactor to verify that it operates freely.
Do not use a screwdriver to force the contactor mechanism.
The transfer switch may use both American Standard and
metric hardware. Use the correct size tools to prevent
rounding of the bolt heads and nuts.
Check the system voltage and frequency. Compare
the voltage and frequency shown on the transfer switch
nameplate to the source voltage and frequency. See
Section 2.3 if the system voltage is different from the
nominal normal (utility) source voltage.
Plan the installation. Use the dimensions given on the
enclosure dimension (ADV) drawings. Select a
mounting site that complies with local electrical code
restrictions for the enclosure type. Mount the transfer
switch as close to the load and power sources as
possible. Allow adequate space to fully open the
enclosure and to service the switch. Provide cable
bending space and clearance to live metal parts.
Outdoor installations. Transfer switches with
NEMA 3R and 4X enclosures can be installed outdoors.
In locations with very high ambient temperatures,
installation in a shaded area or a location with the
enclosure door facing away from direct sunlight is
recommended.
Prepare the foundation. Ensure that the supporting
foundation for the enclosure is level and straight. Refer
to the dimension drawing for required clearance.
For bottom cable entry, if used, install conduit stubs in
the foundation. Refer to the enclosure dimension
drawing for the conduit stub locations. When pouring a
concrete floor, use interlocking conduit spacer caps or a
wood or metal template to maintain proper conduit
alignment.
Installation of seismically certified transfer
switches. Seismic certification must be requested
when the transfer switch is ordered. See Section 2.6
and the transfer switch dimension (ADV) drawings for
additional installation requirements for transfer switches
with seismic certification.
Install the ATS. Refer to the dimension drawing
supplied with the switch and mount the transfer switch
according to the details and instructions on the drawing.
Smaller transfer switches have clearance holes through
the back of the enclosure for mounting. Bolt the transfer
switches to a wall or other rigid vertical supporting
structure. Use shims to plumb the enclosure. Verify that
the door hinges are vertical to avoid distortion of the
enclosure or door.
Bolt larger transfer switches directly to floor mounting
pads. Use shims to level the enclosure. Verify that the
door hinges are vertical to avoid distortion of the
enclosure or door.