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Lightning protection grounding
The lightning protection system is an independent system consisting of a
lightning rod, conductor and connection joint with the grounding system. The
grounding system usually is shared with the power reference grounding and green
and yellow ground cable grounding. Lightning protection grounding is a building
requirement, not a specific requirement of the switch.
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Electromagnetic compliance grounding
This refers to the grounding to comply with switch electromagnetic compatibility
requirements, including shielded grounding, filter grounds, noise, and interference
control and level reference. The overall grounding requirements are the sum total of
the above. Ground resistance value should be less than 1 ohm.
The ES4700BD provides chassis grounding post in the lower rear chassis,
marked as “GND”. Chassis protection grounding should be properly connected to the
rack grounding connector
The ground cabling procedures are listed below:
Step 1: remove the nuts from the rear chassis grounding posts
Step 2: wrap one end of the green and yellow grounding cable to the grounding posts
Step 3: attach the grounding post nut and tighten well
Step 4: attach the other end of the grounding cable to the rack grounding connector
Note:
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The grounding cable should be made of a good conductor, and the diameter
should be
determined by the possible maximum current that may pass through.
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Bare conductor cabling is forbidden.
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Ground resistance value: the combined grounding resistance should be less than
1 ohm.
2.3.3 Card and module installation
The ES4700BD is a rack-mounting device, various cards and modules are available.
Basic configuration: chassis, power supply modules (optional 1 +1 redundant), system
backplane, fan tray, dust gauze, distribution box. The above parts have been mounted
upon shipment, please verify they are properly locked before installation.
2.3.3.1 Removing and Installing the Cards
The installation procedure is the same for all cards, as shown below:
Step 1: Power down the switch (Hot-swapping is supported by optional cards for the