TP-6836 4/1414 Section 2 Installation
2.2.3 Storage
Store the transfer switch in its protective packing until
final installation. Protect the transfer switch at all times
from excessive moisture, construction grit, and metal
chips. Avoid s torage in low temperature, high humidity
areas where moisture could condense on the unit. See
Figure 2-2 for acceptable storage temperatures.
Environmental Specifications
Operating Temperature -- 2 0 Cto70C(--4F to 158F)
Storage Temperature -- 4 0 Cto85C(--40F to 185F)
Humidity 5% to 95% noncondensing
Figure 2-2 Environmental Specifications
2.2.4 Unpacking
Allow the equipment to warm up to room temperature for
24 hours (minimum) prior to unpacking to prevent
condensation on the electrical apparatus from
surrounding moist air if it is uncrated after cold weather
storage.
Carefully unpack to avoid damaging any of the transfer
switch components. Remove all packing material and
dirt that may have accumulated in the transfer switch or
any of its components.
Note: Do not use c ompressed air to clean the transfer
switch. Cleaning with compressed air can cause
debris to lodge in the components and damage
the switch.
2.3 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.
Hardware damage. 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. Do not
install the transfer s witch if the system voltage and
frequency are different from the nominal normal (utility)
source voltage and frequency or the nominal
emergency source voltage and frequency shown on the
generator set nameplate.
Plan the installation. Use the dimensions given on the
enclosure dimension (ADV) drawings provided with the
switch. 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, 4, or 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.
Installation of seismically certified transfer
switches. Seismic certification must be requested
when the transfer switch is ordered. See Section 2.4
and the transfer switch dimension (ADV) drawings for
additional installation requirements for transfer
switches with seismic certification.
Prepare the foundation. Ensure that the supporting
foundation for the enclosure is level and straight. 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.
Install the transfer switch. Refer to the trans fer switch
dimension drawing for dimensions, mounting hole
locations, and cable entry locations.
For floor mounting, bolt the mounting feet to the floor,
shimming the mounting feet as needed to plumb the
enclosure so that the door hinges are vertical to avoid
any distortion of the enclosure or door.
Keyhole slots for wall mounting are provided in the rear
panel of the enclosure. Plumb the enclosure to ensure
that the door hinges are vertical to avoid any distortion of
the enclosure or door. Place washers behind the
mounting bracket keyholes to shim the enclosure to a
plumb condition.
When drilling entry holes for any conductors, cover the
transfer switch components for protection from metal
chips and construction grit.
Note: Do not use compressed air to clean the switch.
Cleaning with compressed air can cause debris
to lodge in the components and damage the
switch.
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