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The switch and DC power source should be installed close to each
other so that the DC power cables are kept as short as possible to
minimize voltage loss.
The switch and power supply should be properly connected to a
protective earth ground.
The switch and power supply should be individually grounded to
the grounding conductor. Do not daisy-chain the ground wires.
Powered devices connected to the LAN ports on the switch should
be grounded to the same grounding conductor at the service
entrance as the switch.
LAN ports should have additional lightning protections as specified
in 803.3at Section 33.4.1.1.2, Environment B Requirements, when
connected to powered devices that are not grounded to the same
grounding conductor at the service entrance as the switch.
Electromagnetic interference might occur between switches and
other devices when multiple switches are powered by a single DC
power supply. This can be addressed by installing clamp-on ferrite
beads on the DC power cables, between the DC power supply and
switches.
Recommendations for ground resistivity are given in Table 10.
Table 10. Ground Resistivity Recommendations
Level
Best Practice
Acceptable
Marginal
Non-compliant
IS230-10GP Industrial Ethernet Layer 2 Switch Installation Guide
Recommendation
<5 ohms
5 to 15 ohms
15 to 25 ohms
>25 ohms
49
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