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Table 26: Site Electrical Wiring Guidelines
GuidelinesSiteWiring Factor
Ifyour siteexperiencesanyof the followingproblems,consult
expertsin electrical surge suppressionand shielding:
•
Improperlyinstalledwirescauseradiofrequencyinterference
(RFI).
•
Damage from lightning strikes occurswhen wiresexceed
recommended distances or passbetweenbuildings.
•
Electromagneticpulses(EMPs) causedby lightning
damages unshieldedconductors and electronic devices.
Signaling limitations
Toreduceoreliminateradiofrequencyinterference(RFI)from
yoursite wiring, do the following:
•
Usetwisted-paircablewithagooddistributionofgrounding
conductors.
•
If youmust exceedthe recommendeddistances,use a
high-qualitytwisted-paircablewith one ground conductor
foreachdatasignal when applicable.
Radiofrequencyinterference
If yoursite is susceptible toproblemswith electromagnetic
compatibility (EMC), particularlyfrom lightning or radio
transmitters,seek expert advice.
Someof the problemscausedby strongsourcesof
electromagneticinterference(EMI) are:
•
Destructionof the signal driversand receivers in the switch
•
Electricalhazards asa result of powersurges conducted
over the lines intothe equipment
Electromagneticcompatibility
Related Topics General Safety Guidelines and Warnings for EX Series Switches on page 207•
• GeneralElectrical SafetyGuidelines and Warningsfor EX Series Switcheson page235
• Prevention of Electrostatic Discharge Damage on EX Series Switches on page 236
• Power Supply in EX2200 Switches
• Power Supply in EX3200 and EX4200 Switches on page 27
• AC Power Supply in EX4500 Switches
• AC Power Supply in an EX8200 Switch
• DC Power Supply in an EX8200 Switch
Environmental Requirements and Specifications for EX Series Switches
The switch must be installed in a rack or cabinet housed in a dry, clean, well-ventilated,
and temperature-controlled environment.
Copyright ©2010,Juniper Networks,Inc.90
CompleteHardwareGuide forEX3200 andEX4200 EthernetSwitches