Cable Routing and Electromagnetic Interference (EMI) Guidelines
RS485 data communications, ethernet communications and other low voltage signals can be subject to electrical interference.
This potential can result in intermittent malfunction or anomaly that is difficult to diagnose. To avoid this possibility, always use earth shielded cables, securely bonded to a known, good earth at one end.
In addition, give careful consideration to cable routing during installation.
Cabling Rules
Keep Cable Types Separate:
- Never route signal, data, or low-voltage control cables alongside high-voltage power cables.
- Do not run signal or data cables in the same bundle or tray as control cables. If necessary, attach the cable to the outside of the earthed cable tray.
Grounding (Earth) Guidelines
- Always connect each electronic device’s ground directly to the main grounding point of the equipment package.
- Never daisy-chain grounding cables from one component to another.
Cable Routing
- If signal, data, or control cables must cross high-voltage power lines, always cross at a 90° angle to minimize exposure to interference fields.
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