Thanks for John's reply The contents of clause 6.3 and 1.4.11 of IEC60950-1 are moved to IEC60368-1 1st edition
6.2.2.4 PS1 PS1 is a circuit where the power source, (see Figure 40) measured according to 6.2.2, does not exceed: �C 500 W measured during the first 3 s; and �C 15 W measured after 3 s. For the purpose of this standard, the power available from external circuits described in Table 16, ID numbers 11, 12, 13 and 14, are considered to be PS1. 6.5.4 Requirements for interconnection to building wiring. External paired conductor cable circuits, such as those described in Table 16, ID numbers 11, 12, 13 and 14 having a minimum wire diameter of 0,4 mm, shall have the current limited to 1,3 A. Please tell me if you know the current requirement and power requirement when a equipment intends to provide power over the telecommunication wiring system. Zhang guoqing -----邮件原件----- 发件人: John Woodgate [mailto:j...@jmwa.demon.co.uk] 发送时间: 2013年9月11日 22:50 收件人: EMC-PSTC@LISTSERV.IEEE.ORG 主题: Re: [PSES] question on clause 6.3 and 1.4.11 of IEC60950-1 In message <7d25799235e00f4c9b04eca410c1c5bf8f0ba...@szxema502-mbx.china.huawei.com> , dated Wed, 11 Sep 2013, "Zhangguoqing (A)" <zhangguoq...@huawei.com> writes: >6.3 Protection of the telecommunication wiring system from overheating >Equipment intended to provide power over the telecommunication wiring >system to remote equipment shall limit the output current to a value >that does not cause damage to the telecommunication wiring system, due >to overheating, under any external load condition. The maximum >continuous current from equipment shall not exceed a current limit that >is suitable for the minimum wire gauge specified in the equipment >installation instructions. The current limit is 1,3 A if such wiring is >not specified. NOTE 2 The minimum wire diameter normally used in >telecommunication wiring is 0,4 mm, for which the maximum continuous >current for a multipair cable is 1,3 A. > >1.4.11 Power from a telecommunication network >For the purpose of this standard, the power available from a >TELECOMMUNICATION NETWORK is considered to be limited to 15 VA. > >My question is , if a equipment intends to provide power over the >telecommunication wiring system, the current and the power should be >controlled at the same time? or, only the current should be controlled? 1.4.11 is not a requirement, it is an assumption. Why it is stated, and why it is included under General conditions for tests are questions that the authors of the text should address. Unless a 'creative' interpretation of 1.4.11 indicates otherwise, I suggest that 1.4.11 has no effect on 6.3 and you need to limit only the current. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk If dictionaries were correct, we would only need one, because they would all give the same information. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
