Cisco 6509 Installation Guide - Page 86

Site Requirements Chapter 2 Preparing for Installation System Grounding Grounding is one of the most important parts of equipment installation. Proper grounding practices ensure that the buildings and the installed equipment within them have low-impedance connections and low-voltage differentials between chassis. When you properly ground systems during installation, you reduce or prevent shock hazards, equipment damage due to transients, and data corruption. Table 2-1 lists some general grounding practice guidelines. Table 2-1 Gounding Practice Guidelines Environment Electromagnetic Noise Severity Level Grounding Recommendations Commercial building is subjected to direct lightning strikes. High For example, some places in the United States, such as Florida, are subject to more lightning strikes than other areas. All lightning protection devices must be installed in strict accordance with manufacturer recommendations. Conductors carrying lightning current should be spaced away from power and data lines in accordance with applicable recommendations and codes. Best grounding practices must be closely followed. Commercial building is located in an area where lightning storms frequently occur but is not subject to direct lightning strikes. High Best grounding practices must be closely followed. Commercial building contains a mix of information technology equipment and industrial equipment, such as welding. Medium to High Best grounding practices must be closely followed. Existing commercial building is not subject to natural environmental noise or man-made industrial noise. This building contains a standard office environment. This installation has a history of malfunction due to electromagnetic noise. Medium Best grounding practices must be closely followed. Determine source and cause of noise if possible, and mitigate as closely as possible at the noise source or reduce coupling from the noise source to the victim equipment. New commercial building is not Low subject to natural environmental noise or man-made industrial noise. This building contains a standard office environment. Best grounding practices should be followed as closely as possible. Electromagnetic noise problems are not anticipated, but installing a best practice grounding system in a new building is often the least expensive route and the best way to plan for the future. Existing commercial building is Low not subject to natural environmental noise or man-made industrial noise. This building contains a standard office environment. Best grounding practices should be followed as much as possible. Electromagnetic noise problems are not anticipated, but installing a best practice grounding system is always recommended. Catalyst 6500 Series Switches Installation Guide 2-6 OL-5781-04