ITU-T K 64-2011 Safe working practices for outside equipment installed in particular environments (Study Group 5)《在特殊环境中户外设备安装的安全操作准则 5号研究组》.pdf
《ITU-T K 64-2011 Safe working practices for outside equipment installed in particular environments (Study Group 5)《在特殊环境中户外设备安装的安全操作准则 5号研究组》.pdf》由会员分享,可在线阅读,更多相关《ITU-T K 64-2011 Safe working practices for outside equipment installed in particular environments (Study Group 5)《在特殊环境中户外设备安装的安全操作准则 5号研究组》.pdf(26页珍藏版)》请在麦多课文档分享上搜索。
1、 International Telecommunication Union ITU-T K.64TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2011) SERIES K: PROTECTION AGAINST INTERFERENCE Safe working practices for outside equipment installed in particular environments Recommendation ITU-T K.64 Rec. ITU-T K.64 (01/2011) i Recommendation
2、ITU-T K.64 Safe working practices for outside equipment installed in particular environments Summary Recommendation ITU-T K.64 describes working practices for service personnel to help them work safely in telecommunication installations in three specific environments. The specific environments cover
3、ed in this Recommendation are characterized by wet conditions or close proximity to exposed metallic parts. The working practices apply to telecommunication plants with voltage levels higher than the limits defined for analogue PSTN circuits, such as remote feeding telecommunication current or volta
4、ge (RFT-C or RFT-V) circuits. This version of Recommendation ITU-T K.64 includes a warning regarding contact with terminals carrying RFT circuits with small parts of the body, e.g., back of the hand. The references have been updated. History Edition Recommendation Approval Study Group 1.0 ITU-T K.64
5、 2004-02-29 5 2.0 ITU-T K.64 2011-01-13 5 ii Rec. ITU-T K.64 (01/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Se
6、ctor (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets eve
7、ry four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purvie
8、w, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is volunt
9、ary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the
10、 negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve
11、the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommen
12、dation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at ht
13、tp:/www.itu.int/ITU-T/ipr/. The ITU-T thanks the International Electrotechnical Commission (IEC) for permission to reproduce information from IEC Technical Report 60479-1. All such extracts are copyright of IEC, Geneva, Switzerland. All rights reserved. Further information on the IEC is available fr
14、om http:/www.iec.ch/. IEC has no responsibility for the placement and context in which the extracts and contents are reproduced by ITU-T, nor is IEC in any way responsible for the other content or accuracy therein. ITU 2011 All rights reserved. No part of this publication may be reproduced, by any m
15、eans whatsoever, without the prior written permission of ITU. Rec. ITU-T K.64 (01/2011) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 1 4 Abbreviations 2 5 Telecommunication particular workplaces . 3 6 Voltage levels on TLC installations . 3 7 Work practices on TLC plants in par
16、ticular environments . 5 7.1 Switching off the power supply 5 7.2 Practices to be used when working on live telecommunication circuits 5 8 Work on telecommunication installations at risk of electric shock 7 8.1 Work on equipment or devices (terminal box, etc.) . 7 8.2 Work on cables . 8 Appendix I R
17、ationale of safe voltage limit values for workplace at major risk of electric shock . 9 I.1 Operating cases . 9 I.2 Calculation assumption 9 I.3 Limit current calculation 11 I.4 Voltage limit calculation 14 Bibliography. 18 iv Rec. ITU-T K.64 (01/2011) Introduction Network operators, in their teleco
18、mmunication infrastructure, use equipment that is remotely powered by symmetrical or coaxial pair cables. The voltages and currents that power these systems differ among them, and comply with the limit values defined in standards IEC 60950-1 and IEC 60950-21 for symmetrical pair cables and in standa
19、rd IEC 60728-11 for coaxial cables. The limits in these standards have been defined to allow service personnel to work safely on these lines without de-energizing the circuits. Nevertheless, there are telecommunication environments that necessitate additional precautions to enable service personnel
20、to work safely on circuits that are usually considered safe to touch. These environments are characterized as wet conditions, sometimes associated with standing water. This Recommendation lists three practical situations where additional precautions are needed and defines how the service personnel s
21、hould perform work to reduce risk associated with these situations. Specific applications, local conditions or regulations may give rise to a need for additional safeguards or modifications to practices presented in this Recommendation. Rec. ITU-T K.64 (01/2011) 1 Recommendation ITU-T K.64 Safe work
22、ing practices for outside equipment installed in particular environments 1 Scope The scope of this Recommendation is to provide working procedures for maintenance activities in specific environments for telecommunication plants with voltage levels higher than the limits defined for analogue PSTN cir
23、cuits. The specific environments covered in this Recommendation are characterized by wet conditions or close proximity to exposed metallic parts. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of t
24、his Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and oth
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