tailieunhanh - CCNA 1 and 2 Companion Guide, Revised (Cisco Networking Academy Program) part 95

Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Revised part 95 is the Cisco approved textbook to use alongside version of the Cisco Networking Academy Program CCNA 1 and CCNA 2 web-based courses. The topics covered provide you with the necessary knowledge to begin your preparation for the CCNA certification exam (640-801, or 640-821 and 640-811) and to enter the field of network administration. | Page 909 Tuesday May 20 2003 4 54 PM Safety 909 Bonding Bonding involves providing a means for various wiring fixtures to interconnect with the grounding system see Figure A-16 . It can be thought of as an extension of ground wiring. A device such as a switch or a router might have a bonding strap between its case and a ground circuit to ensure a good connection. Figure A-16 Bonding Electrical Service Panel Approved Bonding Connector 6 AWG Ground for Telecommunications Cable and Equipment Metallic Service Conduit Properly installed bonding and grounding will accomplish the following Minimize electrical surge spike effects Maintain the integrity of the electrical grounding plant Provide a safer and more effective path to ground Telecommunications bonds typically are used in the following ways Entrance facilities Equipment rooms Telecommunications rooms Grounding and Bonding Standards The National Electrical Code contains much information on grounding and bonding. The TIA EIA standard on grounding and bonding TIA EIA-607-A Commercial Building Grounding and Bonding Requirements for Telecommunications extends grounding and bonding into the telecommunications structured cabling system. TIA EIA-607-A specifies the exact interface points between the grounding system of a building and the telecommunication equipment grounding configuration. It supports a multi vendor Page 910 Tuesday May 20 2003 4 54 PM 910 Appendix A Structured Cabling multi product environment for the grounding practices for various systems that may be installed on customer premises. It also specifies the necessary grounding and bonding configurations needed in the building to support this equipment. Lab and Workplace Safety Practices Although cable installation is generally a safe profession there are plenty of opportunities for being injured. Many injuries are caused when installers come in contact with stray sources of voltage called foreign voltages such as lightning static .