Cisco 4948 Installation Guide - Page 37

Chapter 2 Preparing for Installation System Grounding Table 2-1 Grounding Practice Guidelines (continued) Environment Electromagnetic Grounding Recommendations Noise Severity Level New commercial building is not Low subject to natural environmental noise or man-made industrial noise. This building contains a standard office environment. Grounding best 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. Grounding best practices should be followed as much as possible. Electromagnetic noise problems are not anticipated, but installing a best practice grounding system is always recommended. Note In all situations, grounding practices must comply with Section 250 of the National Electric Code (NEC) requirements or local laws and regulations. A 6 AWG grounding wire is preferred from the chassis to the rack ground or directly to the common bonding network (CBN). The equipment rack should also be connected to the CBN with 6 AWG grounding wire. Caution Category 5e, Category 6, and Category 6a cables can store large levels of static electricity because of the dielectric properties of the materials used in their construction. Always ground the cables (especially in new cable runs) to a suitable and safe earth ground before connecting them to the port on the switch. Maintaining Safety with Electricity When working on electrical equipment, follow these guidelines: • Do not work alone if potentially hazardous conditions exist anywhere in your work space. • Never assume that power is disconnected from a circuit; always check the circuit before working on it. • Look carefully for possible hazards in your work area, such as damp floors, ungrounded power extension cables, frayed or damaged power cords, and missing safety grounds. • If an electrical accident occurs, proceed as follows: - Use extreme caution; do not become a victim yourself. - Disconnect power from the system. - If possible, send another person to get medical aid. Otherwise assess the condition of the victim, and then call for help. - Determine if the person needs rescue breathing or external cardiac compressions; then take appropriate action. • Use the product within its marked electrical ratings and product usage instructions. • Install the product in compliance with local and national electrical codes. OL-21561-02 Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide 2-9