Table 31: Site Electrical Wiring Guidelines (continued)GuidelinesSite Wiring FactorIf your site is susceptible to problems with electromagneticcompatibility (EMC), particularly from lightning or radiotransmitters, seek expert advice.Some of the problems caused by strong sources ofelectromagnetic interference (EMI) are:• Destruction of the signal drivers and receivers in the switch• Electrical hazards as a result of power surges conductedover the lines into the equipmentElectromagnetic compatibilityRelatedDocumentationGeneral Safety Guidelines and Warnings for J-EX Series Switches on page 201•• General Electrical Safety Guidelines and Warnings for J-EX Series Switches on page 229• Prevention of Electrostatic Discharge Damage on J-EX Series Switches on page 230• AC Power Supply in a J-EX8200 Switch on page 39Environmental Requirements and Specifications for J-EX Series SwitchesThe switch must be installed in a rack or cabinet housed in a dry, clean, well-ventilated,and temperature-controlled environment.Ensure that these environmental guidelines are followed:• The site must be as dust-free as possible, because dust can clog air intake vents andfilters, reducing the efficiency of the switch cooling system.• Maintain ambient airflow for normal switch operation. If the airflow is blocked orrestricted, or if the intake air is too warm, the switch might overheat, leading to theswitch temperature monitor shutting down the switch to protect the hardwarecomponents.Table 32 on page 66 provides the required environmental conditions for normal switchoperation.Table 32: J-EX Series Switch Environmental TolerancesToleranceDescriptionNo performance degradation to 10,000 feet (3048 meters)AltitudeNormal operation ensured in relative humidity range of 10% through85%, noncondensingRelative humidityNormal operation ensured in temperature range of 32° F through104° F (0° C through 40° C)Temperature66Dell PowerConnect J-Series J-EX8216 Ethernet Switch Hardware Guide
