Chapter 2 Site Planning
Site Power Requirements
EMI Recommendations
Follow these guidelines when setting up the site wiring. When planning the location of the new system, consider electromagnetic interface (EMI), the distance limitations for signaling, and connector compatibility.
When wires are run for any significant distance in an electromagnetic field, radio frequency interference (RFI) can occur between the field and the signals on the wires.
•Bad plant wiring can result in radio frequency interference.
•Strong EMI, especially when caused by lightning or radio transmitters, can destroy the signal drivers and receivers in the switch and can create an electrical hazard by conducting power surges through lines and into equipment.
Note To predict and remedy strong EMI, you might need to consult RFI experts.
Power Requirements and Heat Dissipation
The power requirements might be useful for planning the power distribution system needed to support the switches. Heat dissipation is an important consideration for sizing the
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