TP-6833 2/16
12 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 moisture, construction grit, and metal chips. Avoid
storage in low-temperature and high-humidity areas
where moisture could condense on the unit. See
Figure 2-2 for acceptable storage temperatures.
Environmental Specifications
Operating Temperature
--20
C to 70
C (--4
F to 158
F)
Storage Temperature
--40
C to 85
C (--40
F to 185
F)
Humidity
5% to 95% noncondensing
Figure 2-2
Environmental Specifications
2.2.4
Unpacking
Allow the equipment to warm to room temperature for at
least
24 hours
before
unpacking
to
prevent
condensation on the electrical apparatus. Use care
when unpacking to avoid damaging transfer switch
components. Remove dirt and packing material that
may have accumulated in the transfer switch or any of its
components.
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.
For 600--800 amp transfer switches, remove the lag
screws that secure the transfer switch to the shipping
skid. For 1000--4000 amp transfer switches, open the
enclosure door to remove the lag screws that secure the
transfer switch to the skid.
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.
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 switch 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.
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.
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.
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.
Install the ATS.
Mount 30- through 400-amp transfer
switches to a wall or other rigid vertical supporting
structure. Clearance holes through the back of each
enclosure are provided for mounting.
Level the
enclosure and use shims if needed to make it plumb.
Verify that the door hinges are vertical to avoid distortion
of the enclosure or door.
Bolt 600- through 4000-amp automatic transfer
switches directly to floor mounting pads. Use shims if
needed to plumb the enclosure. Verify that the door
hinges are vertical to avoid distortion of the enclosure or
door.
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