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To help prevent electric shock, plug the system and peripheral power cables into properly grounded electrical
outlets. T hese c ables are equipped with t hree-prong pl ugs t o h elp e nsure pr oper gr ounding. D o n ot use
adapter plugs or remove the grounding prong from a cable. If you must use an extension cable, use a 3-wire
cable with properly grounded plugs.
•
Observe ex tension c able and p ower s trip r atings. Make s ure t hat t he t otal ampere r ating of al l pr oducts
plugged into the extension cable or power strip does not exceed 80 percent of the ampere ratings limit for the
extension cable or power strip.
•
To help protect your system from sudden, transient increases and decreases in electrical power, use a surge
suppressor, line conditioner, or uninterruptible power supply (UPS).
•
Position system cables and power cables carefully; route cables so that they cannot be stepped on or tripped
over. Be sure that nothing rests on any cables.
•
Do not modify power cables or plugs. Consult a licensed electrician or your power company for site
modifications. Always follow your local/national wiring rules.
•
When c onnecting or d isconnecting po wer t o h ot-pluggable p ower s upplies, if of fered w ith your s ystem,
observe the following guidelines:
Install the power supply before connecting the power cable to the power supply.
Unplug the power cable before removing the power supply.
If the system has multiple sources of power, disconnect power from the system by unplugging all power
cables from the power supplies.
•
Move products with care; ensure that all casters and/or stabilizers are firmly connected to the system. Avoid
sudden stops and uneven surfaces.
Observe t he f ollowing pr ecautions f or r ack s tability and s afety. Also, r efer t o the r ack i nstallation d ocumentation
accompanying the system and the rack for specific caution statements and procedures.
•
Systems are considered to be components in a rack. Thus, "component" refers to any system as well as to
various peripherals or supporting hardware.
•
Before working on the rack, make sure that the stabilizers are secured to the rack, extended to the floor, and
that t he f ull weight of t he rack r ests on t he f loor. I nstall f ront and s ide s tabilizers on a s ingle r ack or f ront
stabilizers for joined multiple racks before working on the rack.
•
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.
•
Do not step on or stand on any component when servicing other components in a rack.
NOTE: All el ectrical wiring must c omply with ap plicable l ocal, r egional or nat ional c odes and
practices.
DGS-3700 Series Layer 2 Gigabit Ethernet Switch Hardware Installation Guide
General Precautions for Rack-Mountable Products
ix
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