1、 TIA STANDARD ANSI/TIA-568-B.1-2-2003 Approved: February 25, 2003 Commercial Building Telecommunications Cabling Standard Part 1: General Requirements Addendum 2 Grounding and Bonding Specifications for Screened Balanced Twisted-Pair Horizontal Cabling TIA-568-B.1-2 (Addendum No. 2 to TIA/EIA-568-B.
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8、From Standards Proposal No. 3-4425-AD2-A, formulated under the cognizance of the TIA TR-42.1 Subcommittee on Commercial Building Telecommunications Cabling.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2003 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A.
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24、4-7179, International (303) 397-7956 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-2 GROUNDING AND BONDING SPECIFICATIONS FOR SCREENED BALANCED TWISTED-PAIR HORIZO
25、NTAL CABLING TABLE OF CONTENTS 1 INTRODUCTION.1 2 PURPOSE AND SCOPE.1 3 NORMATIVE REFERENCES .1 4 DEFINITIONS, ACRONYMS parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated. ANSI and TIA maintain re
26、gisters of currently valid national standards published by them. ANSI/TIA/EIA-568-B.1, Commercial Building Telecommunications Standard Part 1: General Requirements, 2001 ANSI/TIA/EIA-568-B.2, Commercial Building Telecommunications Cabling Standard Part 2: Balanced Twisted-Pair Cabling Components, 20
27、01 ANSI/TIA/EIA-569-A, Commercial Building Standard for Telecommunications Pathways and Spaces, 1998 ANSI/TIA/EIA-606-A, Administration Standard for the Telecommunications Infrastructure of Commercial Buildings, 2002 ANSI/TIA/EIA-J-STD-607-A, Commercial Building Grounding (Earthing) & Bonding Requir
28、ements for Telecommunications standard, 2002 4 DEFINITIONS, ACRONYMS & ABBREVIATIONS 4.1 Definitions The generic definitions in this section have been formulated for use by the entire family of telecommunications infrastructure standards. As such, the definitions do not contain mandatory requirement
29、s of the Standard. Specific requirements are found in the normative sections of this Standard. bonding: The permanent joining of metallic parts to form an electrically conductive path that will ensure electrical continuity and the capacity to conduct safely any current likely to be imposed. bonding
30、conductor: A conductor that interconnects the screened balanced twisted-pair horizontal cabling infrastructure to the telecommunications grounding busbar. earthing: See grounding. effectively grounded: For a definition see the NEC. ground: A conducting connection, whether intentional or accidental,
31、between an electrical circuit (e.g., telecommunications) or equipment and the earth, or to some conducting body that serves in place of earth. grounding: The act of creating a conducting connection, whether intentional or accidental, between an electrical circuit (e.g., telecommunications) or equipm
32、ent and the earth, or to some conducting body that serves in place of earth. 1 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-2 telecommunications grounding busbar:
33、 A common point of connection for telecommunications system and equipment bonding to ground, and located in the telecommunications room or equipment room. 4.2 Acronyms and abbreviations EMC Electromagnetic compatibility NRTL Nationally recognized testing laboratory TGB Telecommunications grounding b
34、usbar TO Telecommunications outlet 5 GROUNDING CONSIDERATIONS 5.1 Corrections and revisions to ANSI/TIA/EIA-568-B.1 The purpose of this clause is to revise clause 4.6 of ANSI/TIA/EIA-568-B.1. These revisions are identified in the following text with additions shown in bold italics and deletions show
35、n as strikeout. 4.6 Grounding considerations Grounding systems are an integral part of the signal or telecommunications cabling system that they support. In addition to helping protect personnel and equipment from hazardous voltages, a proper grounding system may improve the EMC performance of the r
36、educe electromagnetic interference (EMI) to and from the telecommunications cabling system. Improper grounding can produce induced voltages and those voltages can disrupt other telecommunications circuits. Grounding and bonding shall meet the requirements and practices of applicable authorities or c
37、odes. In addition, telecommunications grounding/bonding shall conform to ANSI/TIA/EIA-J-STD-607-A ANSI/TIA/EIA-607 requirements. The screen shield of ScTP cables shall be bonded through a conducting path to the telecommunications grounding busbar (TGB) in the telecommunications room (see subclause 1
38、0.2.5). Grounding of equipment at the work area is usually accomplished through the ground conductor of the equipment power connection. If present, screen Shield connections to at the work area equipment shall be are accomplished through the screen of an ScTP work area patch cord extending from the
39、TO to the equipment. At the work area end of the horizontal cabling, the voltage measured between the screen shield and the ground wire of the electrical outlet used to provide supply power to the workstation equipment shall not exceed 1.0 V rms RMS and shall not exceed 1.0 V dc. The cause of any hi
40、gher voltage should be removed before using the cable. The screen of ScTP connecting hardware shall be bonded to the TGB in the telecommunications room according to the requirements given in normative annex A of this Standard. The horizontal cable screen shall be bonded via a screen termination to t
41、he connecting hardware screen termination. The connecting hardware screen termination is controlled by component specifications and shall be verified to ensure that all applicable requirements are met. 2Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for R
42、esaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-2 ANNEX A (NORMATIVE) GROUNDING (EARTHING) AND BONDING OF SCREENED BALANCED TWISTED-PAIR HORIZONTAL CABLING A.1 General The basic components and requirements for grounding (earthing) and bonding specified herein sh
43、all be followed for every area of a building wherein screened balanced twisted-pair horizontal cabling is installed. The grounding (earthing) and bonding infrastructure for installed screened balanced twisted-pair horizontal cables are also specified herein. The grounding (earthing) and bonding infr
44、astructure for installed screened backbone cables is specified in ANSI/TIA/EIA-J-STD-607-A. In all cases, applicable electrical code requirements shall be satisfied. A.2 Overview of the horizontal cabling grounding (earthing) and bonding infrastructure The screened balanced twisted-pair horizontal c
45、able grounding (earthing) and bonding infrastructure includes four major components as described in A.3: a) Connecting hardware screen termination conductor b) Bonding conductor c) Connecting hardware screen termination d) Telecommunications grounding busbar (TGB) These screened balanced twisted-pai
46、r horizontal cabling grounding (earthing) and bonding components are intended to work in conjunction with telecommunications pathways and spaces (ANSI/EIA/TIA-569-A) and administration (ANSI/TIA/EIA-606-A), including: a) Telecommunications equipment room b) Telecommunications room (TR) c) Telecommun
47、ications labeling and record keeping A.3 Screened balanced twisted-pair horizontal cabling grounding (earthing) and bonding infrastructure components This clause describes the characteristics of the major components of the horizontal cabling grounding (earthing) and bonding infrastructure. A.3.1 Con
48、necting hardware screen termination conductor The screen of all installed screened balanced twisted-pair horizontal cable shall be fitted at each end with screened connecting hardware. The connecting hardware screen termination conductor (see figure A.1) shall enable connections between the cable sc
49、reen extending from one side of the connecting hardware to the cable screen extending from the other side of the connecting hardware. All connecting hardware and cable used in screened balanced twisted-pair horizontal cabling shall comply with annex K of ANSI/TIA/EIA-568-B.2. Individual connecting hardware screen termination conductors may be interconnected in a common connecting hardware screen termination conductor. Connections from the common connecting hardware scree
