Modems, Telecommunications, Or Local Area Network Options - Dell PowerConnect Serie Systeminformationshandbuch

8
Unmanaged Switches System Infor mation Guide
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CAUTION: Safety Instructions (continued)
• Always load the rack from the bottom up, and load the heaviest item in the rack first.
• Make sure that the rack is level and stable before extending a component from the rack.
• 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.
• After a component is inserted into the rack, carefully extend the rail into a locking position, and then slide
the component into the rack.
• 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.
• Ensure that proper airflow is provided to components in the rack.
• Wire the unit with copper wire only, and unless otherwise specified, use 14 American Wire Gauge (AWG)
wire, and protect it with a 7.2-ampere (A) minimum to a 20-A maximum protective device or a 25-A
maximum protective device when used with 90ºC wire.
CAUTION: 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: Before connecting safety ground or power cables to the connector, ensure that
the power is removed from the DC circuit. To ensure that the power is off, locate the
circuit breaker on the DC source circuit (usually at the power distribution of the battery
distribution fuse bay). Switch the circuit breaker to the off position and, if available,
install an approved safety locking device on the circuit breaker or switch.
CAUTION: When stranded wiring is required, use approved wiring termination, such as
closed-loop or spade-type with upturned lugs. These terminations should be the
appropriate size for the wires and must be double crimped, one on the conductor and one
on the insulation.
CAUTION: When installing the unit, the ground connection must always be made first and
disconnected last to prevent an energy hazard.
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 securely 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.

Modems, Telecommunications, or Local Area Network Options

• Do not connect or use a modem during a lightning storm. There may be a risk of electrical shock from
lightning.
• Never connect or use a modem in a wet environment.
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