Table 24: Site Electrical Wiring Guidelines - Juniper EX3300 Complete Hardware Manual

Complete Hardware Guide for EX3300 Ethernet Switches
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Table 24: Site Electrical Wiring Guidelines

Site Wiring Factor Guidelines
Signaling limitations If your site experiences any of the following problems, consult experts in
electrical surge suppression and shielding:
Improperly installed wires cause radio frequency interference (RFI).
Damage from lightning strikes occurs when wires exceed recommended
distances or pass between buildings.
Electromagnetic pulses (EMPs) caused by lightning damage unshielded
conductors and electronic devices.
Radio frequency To reduce or eliminate RFI from your site wiring, do the following:
interference
Use a twisted-pair cable with a good distribution of grounding
conductors.
If you must exceed the recommended distances, use a high-quality
twisted-pair cable with one ground conductor for each data signal when
applicable.
Electromagnetic If your site is susceptible to problems with electromagnetic compatibility
compatibility (EMC), particularly from lightning or radio transmitters, seek expert advice.
Some of the problems caused by strong sources of electromagnetic
interference (EMI) are:
Destruction of the signal drivers and receivers in the switch
Electrical hazards as a result of power surges conducted over the lines
into the equipment
General Safety Guidelines and Warnings on page 149
General Electrical Safety Guidelines and Warnings on page 177
Prevention of Electrostatic Discharge Damage on page 178
Power Supply in EX2200 Switches
Power Supply in EX3200 Switches
Power Supply in EX3300 Switches on page 21
Power Supply in EX4200 Switches
AC Power Supply in EX4300 Switches
DC Power Supply in EX4300 Switches
AC Power Supply in EX4500 Switches
DC Power Supply in EX4500 Switches
AC Power Supply in EX4550 Switches
DC Power Supply in EX4550 Switches
AC Power Supply in an EX4600 Switch
DC Power Supply in an EX4600 Switch
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