1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T L.1203 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2016) SERIES L: ENVIRONMENT AND ICTS, CLIMATE CHANGE, E-WASTE, ENERGY EFFICIENCY; CONSTRUCTION, INSTALLATION AND PROTECTION OF CABLES AND OTHER ELEMENTS OF OUTSIDE
2、PLANT Colour and marking identification of up to 400 VDC power distribution for information and communication technology systems Recommendation ITU-T L.1203 ITU-T L-SERIES RECOMMENDATIONS ENVIRONMENT AND ICTS, CLIMATE CHANGE, E-WASTE, ENERGY EFFICIENCY; CONSTRUCTION, INSTALLATION AND PROTECTION OF C
3、ABLES AND OTHER ELEMENTS OF OUTSIDE PLANT OPTICAL FIBRE CABLES Cable structure and characteristics L.100L.124 Cable evaluation L.125L.149 Guidance and installation technique L.150L.199 OPTICAL INFRASTRUCTURES Infrastructure including node element (except cables) L.200L.249 General aspects and networ
4、k design L.250L.299 MAINTENANCE AND OPERATION Optical fibre cable maintenance L.300L.329 Infrastructure maintenance L.330L.349 Operation support and infrastructure management L.350L.379 Disaster management L.380L.399 PASSIVE OPTICAL DEVICES L.400L.429 MARINIZED TERRESTRIAL CABLES L.430L.449 For furt
5、her details, please refer to the list of ITU-T Recommendations. Rec. ITU-T L.1203 (02/2016) i Recommendation ITU-T L.1203 Colour and marking identification of up to 400 VDC power distribution for information and communication technology systems Summary Recommendation ITU-T L.1203 defines the require
6、ments and guidelines for DC power distribution identification by colour and marking in Telecom/ICT installations (wire, cables, electric distribution boards, interconnections, etc.). It avoids confusion and errors between the different AC and DC power interfaces and distributions used in buildings a
7、nd inside Telecom/ICT systems, as 400 VDC power feeding interfaces standardized in Recommendation ITU-T L.1200 is used more, increasing power density of ICT equipment, energy efficiency, simplified reliable power feeding architecture, costs optimisation, etc. Recommendation ITU-T L.1203 supports the
8、 progressive introduction of up to 400 VDC installations in cohabitation with the existing 48 V and AC distribution. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T L.1203 2016-02-02 5 11.1002/1000/12659 Keywords Colour, direct current (DC), identification, installation, mar
9、king, power cable. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T L.1203 (02/2016) FOREWORD The International Telecommunicat
10、ion Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff ques
11、tions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendation
12、s 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 purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation,
13、the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or
14、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 negative equivalents are used to express requirements. The use of such words does not suggest that compliance w
15、ith the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or appl
16、icability 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 Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to impl
17、ement 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 http:/www.itu.int/ITU-T/ipr/. ITU 2016 All rights reserved. No part of this publication may be reproduced, by any m
18、eans whatsoever, without the prior written permission of ITU. Rec. ITU-T L.1203 (02/2016) iii Table of Contents Page 1 Scope . 1 2 Reference 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and Acronyms . 2 5 Conventions 3 6 Electrical dist
19、ribution identification coverage 3 7 Identification principle 6 7.1 General rules . 6 7.2 Colour and marking of up to 400 VDC conductor wires and cables for A3 or P interface . 6 7.3 Additional recommendation for other DC voltage distribution cabling than up to 400 VDC voltage of A3 interface 8 8 DC
20、 distribution devices additional colour and marking . 8 8.1 General requirements 9 8.2 DC outputs from DC power systems with protective devices 9 8.3 DC sub-distribution boards (with protective devices) 10 8.4 DC power plugs strips inside ICT equipment rooms and cabinets 10 9 Durability of marking a
21、nd reading errors limitation . 10 Appendix I Review of Standards or common use of colour and marking of distribution cabling in AC and DC in buildings and equipment 11 I.1 Recommended colours for wires in IEC 60757 and IEC 60445 . 11 I.2 Other norms or specifications . 11 I.3 Building distribution c
22、able colour and marking standards . 13 Appendix II Justification of the identification wire colour choices 17 Appendix III Wire colour choice in colour range industrial specification . 18 Bibliography. 20 iv Rec. ITU-T L.1203 (02/2016) Introduction This Recommendation has been developed to assist th
23、e ICT industry in their development and wider use of DC powering solutions above the DC voltage range mainly used until now for telecommunication networks equipment (48 V ETSI b-EN 300 132-2). This document was developed jointly by ETSI TC EE and ITU-T Study Group 5 and published as Recommendation I
24、TU-T L.1203 and ETSI Standard ES 203 408, which are equivalent in technical content. DC has been the main source of power of the telecommunication industry since the very beginning as it is efficient, reliable and easily scalable. This solution is a well proven arrangement that has been used for a c
25、entury in almost all of the sites in cohabitation with AC for servers and other buildings services (lighting, facility plugs, lifts, etc.). It is recognized that DC has many potential applications further to those for ICT and that such applications could benefit from ITU-T Recommendation and ETSI St
26、andard. It is also recognized that further standardization activities on LVDC is now starting in other standardization organizations such as IEC. Thus ITU-T and ETSI will pursue cooperation with such organizations to reach maximum international alignment. ETSI and ITU-T have standardized the widespr
27、ead DC power interface at inputs of telecom/ICT equipment used in telecom networks, data centres, and customer sites. The legacy interface for billions of equipment is the SELV voltage range so called 48 V, where the plus pole is grounded as defined for example for interface “A“ in b-ETSI EN 300 132
28、-2. Other complementary ETSI standards define a whole DC distribution including earthing and bonding such as b-ETSI EN 300 253. Higher voltages than 48 V are already widely used in telecom networks for remote powering of signal repeaters on copper or optical telecom transmission lines, with a usual
29、operation in symmetrical voltage up to 200 V in RFT-C or RFT-V telecom remote power feeding standardized in b-ETSI EN 302 099. Higher power density of ICT equipment and overall site power in MW for data centres, have led to the use of higher voltage firstly in AC single or 3 phases up to 400 VAC at
30、the input of servers. The need for resilience, energy efficiency and cost optimization has pushed the introduction of the up to 400 VDC power feeding interface standardized in b-ETSI EN 300 132-3-1 and in ITU-T L.1200. This is now available on many servers and network equipment. As there is a progre
31、ssive introduction of the new DC power interface in cohabitation with existing 48 V and AC distribution, a new standard b-ETSI EN 301 605 was introduced to ensure safety and proper operation especially in mass bonding of EMC sensitive equipment and correct earthing connection to the building structu
32、re earthing network. It appears that there is also a strong need for telecom/data centre operators, equipment manufacturers or installers and end customers to clarify the colour and marking of cables in their installations. This would avoid confusion and errors between the different AC and DC power
33、interfaces and distributions used in the building and inside ICT systems. Considering the user side and very long background experience in the use of DC by the telecom sector, this Recommendation aligns with the safety principles laid down in b-IEC Guide 104 and b-ISO/IEC Guide 51. It accelerates an
34、d encourages the preparation of international standards of cable identification intended for use by manufacturers, users or certification bodies. This Recommendation makes reference to existing IEC standards such as IEC 60445 and b-IEC 60050-195. Considering that DC is widely used in all electronic
35、equipment, e.g., the electric circuit in cars and trucks, solar PV power plants, etc., Appendix I provides useful information on colours of cables inside equipment. Rec. ITU-T L.1203 (02/2016) 1 Recommendation ITU-T L.1203 Colour and marking identification of up to 400 VDC power distribution for inf
36、ormation and communication technology systems 1 Scope The scope of this Recommendation is to define common practice for identification of cabling or parts of the DC electric distribution inside buildings and rooms and inside telecom, ICT and facilities equipment (power plant, cooling, building acces
37、s, monitoring, etc.). This applies to 400 VDC cabling for telecom, ICT equipment and environment equipment using interface defined in b-EN 300 132-3-1 or ITU-T L.1200 and avoids confusion between the DC colour and marking of up to 400 VDC distribution and the other power interfaces identification: 4
38、8 VDC distribution for A interface, AC and uninterrupted AC given by inverters or UPS used in the building. The Recommendation defines: requirements for the colour and identification of separate wires used in DC distribution systems and installations and as much as possible inside equipment between
39、A or P interface and end use; marking and identification of DC multiwire cables, connectors and any associated equipment for DC power distribution; marking identification for sub-distribution boards and interconnection boxes. For DC wires in multiwire cables, recommendations are given for harmonizat
40、ion with separate wire requirements. Recommendations are given on other distribution items (wires, cables and interconnection items) including the functional earthing and bonding arrangement for distribution outside and inside equipment to avoid any confusion with DC distribution identification of t
41、his Recommendation. 2 Reference The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are
42、 subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a docu
43、ment within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T L.1200 Recommendation ITU-T L.1200 (2012), Direct current power feeding interface up to 400 V at the input to telecommunication and ICT equipment. IEC 60417 IEC 60417DB (2002), Graphica
44、l symbols for use on equipment. IEC 60445 IEC 60445 Ed 5.0 (2010), Basic and safety principles for man-machine interface, marking and identification Identification of equipment terminals, conductor terminations and conductors. IEC 60617 IEC 60617DB (2012), Graphical symbols for diagrams. IEC 60757 I
45、EC 60757 (1983), Code for designation of colours. NOTE IEC DB documents refer to database of graphical symbol. Some are joint with ISO e.g., IEC 60417 and ISO7000. 2 Rec. ITU-T L.1203 (02/2016) 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere:
46、3.1.1 electrical equipment b-IEC 60050-826: Item used for such purposes as generation, conversion, distribution or utilization of electric energy, such as electrical machines, transformers, switch gear and control gear, measuring instruments, protective devices, wiring systems, current-using equipme
47、nt. 3.1.2 line conductor b-IEC 60050-195: AC phase conductor or DC pole conductor (deprecated), conductor which is energized in normal operation and capable of contributing to the transmission or distribution of electric energy but which is not a neutral or mid-point conductor. 3.2 Terms defined in
48、this Recommendation This Recommendation defines the following terms: 3.2.1 identification: Colour, graphical symbol, text in alphanumeric notation located on or adjacent to wire or cable terminals or junction boxes. 3.2.2 48 VDC: Defines the 48 Volt Direct Current voltage range as standardized in b-
49、EN 300 132-2. 3.2.3 400 VDC: It defined up to 400 Volt Direct Current voltage range as standardized in ITU-T L.1200. 3.2.4 IT: IT Isolation Terra is the two letter coding of one of the 3 families of earthing arrangements as defined in b-IEC 60364-1, in which the electrical distribution is connected to earth through high resistance or impedance device i.e., HRMG in b-EN 301 605. 3.2.5 RAL: Name of RAL colour coding for industry use. 4 Abbreviations and Acronyms This Recommendation uses
