<AE0F4BD08FEAD211895900805FE67B1FA5C433@CAT>, Colgan, Chris <Chris.Colg a...@tagmclarenaudio.com> inimitably wrote: >There is discussion within our company about removing power switches from >our newer products. The current standard allows us to do this as they can >be switched on and off via a rear panel comms bus connection (ie data link). > >My specific questions are: > >a) will the 7th draft allow us to do this?
Yes. If it stays like the latest draft. > >b) will the 7th draft remove the anomaly that requires a product to have a >mechanical switch unless it has a data link or timer function? I have >always thought this to be crazy, either all products should have switches or >none at all. Yes. If it stays like the latest draft. >For example, >Amplifier with power relay operated by front panel tact switch via >microprocessor - not allowed >Amplifier with power relay operated by data link (used or not) via >microprocessor - allowed IEC TC92 has now introduced a formal system for registering 'IEC interpretations' of IEC60065, which are sent to all National Committees, IECEE/CTL and, through CENELEC TC92/X, to the corresponding CENELEC test-house committee OSM. These interpretations are supposed to be published by the national committees, and BSI will probably issue them as 'PDs', and not free of charge. In this case, a somewhat relevant interpretation has already been produced: QUOTE Subclause 14.6.2: Application of switches Question: Can we consider the below-described function as "capable of being switched-off automatically and without human intervention at the time of switching"? Description: The product's power consumption is more than 15W and no manually operated mechanical switch is applied. The player consists of a CDR loader, CD changer and a hard-disc drive. On this hard disc drive music can be stored in the MP-3 format. Function: After down-loading a CD disc on the hard disc, the user may switch the player into the off/stand-by mode but the player will (or has to) complete first several MP-3 conversion activities on the hard-disc which take several minutes (might be up to 1/2 h). When the MP-3 conversion on the hard disc has been completed the player will automatically switch-off to the low power consumption/stand-by mode. Because of this we cannot have a manually operated mechanical switch which is switching off the power, so we would like to make use of the exceptions as given in clause 14.6.2 of the IEC60065, 6th edition. Interpretation of the WG: No switch is required in this case. Rationale: In this case the switching-off is controlled by a data link. Data links can exist between apparatus as well as within one apparatus. Actions: No action towards the text in the IEC 60065 is needed. [Before an amendment could be issued, the next edition will be published.] UNQUOTE > >c) does the 7th edition define what "off" is? Eg apparatus does not >function, apparatus consumes less than 15W, mains power is disconnected etc. Note explicitly, but 5.4.2 prohibits the use of the 'OFF' symbol 60417-2-IEC-5008 (and 5010) unless an all-pole mains switch is fitted. -- Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839 Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk Why not call a vertically- applied manulo-pedally-operated quasi-planar chernozem-penetrating and excavating implement a SPADE? ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
