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Site Electrical Wiring Guidelines

This topic applies to hardware devices in the EX Series product family, which includes switches and the XRE200 External Routing Engine.

This topic also applies to hardware devices in the QFX Series.

Table 1 describes the factors you must consider while planning the electrical wiring at your site.

Warning: It is particularly important to provide a properly grounded and shielded environment and to use electrical surge-suppression devices.

Table 1: 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 interference	To reduce or eliminate radio frequency interference (RFI) from your site wiring, do the following: Use 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 compatibility	If your site is susceptible to problems with electromagnetic 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

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 interference

To reduce or eliminate radio frequency interference (RFI) from your site wiring, do the following:

Use 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 compatibility

If your site is susceptible to problems with electromagnetic 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

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Published: 2011-12-01