Site Electrical Wiring Guidelines

This topic applies to the following Junos Space Appliances: JA1500 and JA2500.

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 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 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 as follows: Destruction of the signal drivers and receivers in the appliance. Electrical hazards due to power surges conducted over the lines into the equipment.