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Site Electrical Wiring Guidelines

Table 25 describes the factors you must consider while planning the electrical wiring at your site.

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

To comply with intrabuilding lightning/surge requirements, intrabuilding wiring must be shielded and the shield for the wiring must be grounded at both ends.

Table 25: Site Electrical Wiring Guidelines

Site Wiring Factor

Guidelines

Signaling limitations

If your site has experienced any of the following problems, consult experts in electrical surge suppression and shielding:

  • Improperly installed wires emitted radio interference.
  • Damage from lightning strikes occurred when wires exceeded recommended distances or passed between buildings.
  • Damage to unshielded conductors and electronic devices was caused by the electromagnetic pulse (EMP) caused by lightning.

Radio frequency interference (RFI)

To reduce or eliminate the emission of 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, you might want to 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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