D-Link DGS-3312SR Release 3.5 Manual page 12

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Systems are considered to be components in a rack. Thus, "component" refers to any system as well as to various
peripherals or supporting hardware.
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Before working on the rack, make sure that the stabilizers are secured to the rack, extended to the floor, and that the
full weight of the rack rests on the floor. Install front and side stabilizers on a single rack or front stabilizers for joined
multiple racks before working on the rack.
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Always load the rack from the bottom up, and load the heaviest item in the rack first.
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Make sure that the rack is level and stable before extending a component from the rack.
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Use caution when pressing the component rail release latches and sliding a component into or out of a rack; the slide
rails can pinch your fingers.
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After a component is inserted into the rack, carefully extend the rail into a locking position, and then slide the
component into the rack.
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Do not overload the AC supply branch circuit that provides power to the rack. The total rack load should not exceed
80 percent of the branch circuit rating.
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Ensure that proper airflow is provided to components in the rack.
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Do not step on or stand on any component when servicing other components in a rack.
DGS-3312SR Stackable Gigabit Layer 3 Switch
CAUTION: Installing systems in a rack without the front and side
stabilizers installed could cause the rack to tip over, potentially resulting in
bodily injury under certain circumstances. Therefore, always install the
stabilizers before installing components in the rack. After installing
system/components in a rack, never pull more than one component out of
the rack on its slide assemblies at one time. The weight of more than one
extended component could cause the rack to tip over and may result in
serious injury.
NOTE: A qualified electrician must perform all connections to DC power
and to safety grounds. All electrical wiring must comply with applicable
local or national codes and practices.
CAUTION: Never defeat the ground conductor or operate the equipment
in the absence of a suitably installed ground conductor. Contact the
appropriate electrical inspection authority or an electrician if you are
uncertain that suitable grounding is available.
CAUTION: The system chassis must be positively grounded to the rack
cabinet frame. Do not attempt to connect power to the system until
grounding cables are connected. Completed power and safety ground
wiring must be inspected by a qualified electrical inspector. An energy
hazard will exist if the safety ground cable is omitted or disconnected.
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