Re: Mains cords
John, A statement in the product's site prep guide to say Installation by a locally licensed electrician is required. Electrical installation must conform to local jurisdiction electrical code. would be helpful. By including this statement the local licensed electrician must used the proper cordset and plug cap as mandated by local code regardless of the country location. Regards, Paul J. Smith Teradyne, Boston the above opinion is my own and not that of my employer. John Woodgate j...@jmwa.demon.co.uk@majordomo.ieee.org on 01/15/2002 11:05:36 PM Please respond to John Woodgate j...@jmwa.demon.co.uk Sent by: owner-emc-p...@majordomo.ieee.org To: emc-p...@majordomo.ieee.org cc: Subject: Re: Mains cords I read in !emc-pstc that rob.humph...@reuters.com wrote (in T58779cc7bc c407b706...@reuters.com) about 'Mains cords', on Tue, 15 Jan 2002: Can anyone tell me if equipment supplied as compliant to IEC60950 and has an IEC mains inlet plug has to be supplied with its mains cord if it is not supplied to an end user? To which country/ies is it to be supplied? -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: Mains cords
Hi Rob, The quick answer to your question is no. If you do not supply the cordset, you must supply a description of the cordset that is suitable for your equipment. The description can be in the form of a flyer or a part of your installation guide and in the language of the country in which it is sold. The description should include information on the following: * The maximum length (4.5 m/15 feet) * The nominal size of the conductors expressed in mm squared * The cordage should bear the HAR mark of the approval mark of the country in which it is sold * A description of the attachment plug * If the cordset is used as the disconnect device, there should be a statement about plugging it into an unobstructed wall outlet Sincerely, Robert Loop Engineering Supervisor Wyle Laboratories Product Safety ph - (256) 837-4411 x313 fax- (256) 721-0144 e-mail: rl...@hnt.wylelabs.com -- From: rob.humph...@reuters.com[SMTP:rob.humph...@reuters.com] Reply To: rob.humph...@reuters.com Sent: Tuesday, January 15, 2002 11:28 AM To: emc-p...@ieee.org Subject: Mains cords Can anyone tell me if equipment supplied as compliant to IEC60950 and has an IEC mains inlet plug has to be supplied with its mains cord if it is not supplied to an end user? Thanks for any help Rob -- -- Visit our Internet site at http://www.reuters.com Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of Reuters Ltd. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: Mains Cords in the UK and the fuse rating
I agree provided there is no earthing conductor. I thought the 2 meter cord length happens to meet earth fault requirements as many cords are 3 conductor and the 60950 standard specifies the ground conductor resistance to be less than 0.1 ohms as verified by test. kyle -Original Message- From: Rich Nute [mailto:ri...@sdd.hp.com] Sent: Friday, November 30, 2001 6:39 PM To: j...@jmwa.demon.co.uk Cc: emc-p...@majordomo.ieee.org Subject: Re: Mains Cords in the UK and the fuse rating snip So, the 2-meter length restriction (0.092 ohms) appears not to be in consideration of the short- circuit current. It appears that a 0.75 sq mm cord could be 20 meters in length (0.92 ohms) and still operate the overcurrent device. Best regards, Rich
Re: Mains Cords in the UK and the fuse rating
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in 200112010039.qaa15...@epgc196.sdd.hp.com) about 'Mains Cords in the UK and the fuse rating', on Fri, 30 Nov 2001: So, the 2-meter length restriction (0.092 ohms) appears not to be in consideration of the short- circuit current. It appears that a 0.75 sq mm cord could be 20 meters in length (0.92 ohms) and still operate the overcurrent device. The disconnection time in Europe has to be much less than 1 minute. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Mains Cords in the UK and the fuse rating
Hi John: More significantly, its resistance affects the maximum short-circuit current that can flow. This is a valid consideration with regard to safety. Given a 6-amp maximum, 0.75 sq mm size, and 2 meters length. In North America, 2X rated current is the 1-minute operating time of a fuse or circuit-breaker. The maximum resistance of the power cord (assuming a short at the load end of the cord) would be: 120 V R = --- = 4 ohms. 30 A From the wire tables, 0.75 sq mm wire is about 0.023 ohm/meter. For 4 ohms resistance we would need 4/0.023 or 173 meters of wire, or a 2-wire cord of about 85 meters. In continental Europe, using the same assumptions about current and operating time, the maximum resistance of the cord would be: 230 V R = --- = 7.1 ohms. 32 A The wire length would be 7.1/0.023 or 312 meters, and the cord length would be 156 meters. So, the 2-meter length restriction (0.092 ohms) appears not to be in consideration of the short- circuit current. It appears that a 0.75 sq mm cord could be 20 meters in length (0.92 ohms) and still operate the overcurrent device. Best regards, Rich --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Mains Cords in the UK and the fuse rating
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in 200111301943.laa15...@epgc196.sdd.hp.com) about 'Mains Cords in the UK and the fuse rating', on Fri, 30 Nov 2001: The length of the cord will affect the voltage at the load end of the cord. More significantly, its resistance affects the maximum short-circuit current that can flow. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Mains Cords in the UK and the fuse rating
For an IT product there is a restriction in the use of mains cords with a cross sectional area of 0.75mm2 for units up to 6 amps when the cord is greater than 2m in length (EN60950: 2000 section 3.2.5) I am curious as to the hazard that is prevented by this length requirement. Fundamentally, the power cord comprises a very long resistor. The higher the current, the more power is dissipated in the resistor. The power is uniformly distributed throughout the length of the power cord. The power dissipated in the resistor is converted to thermal energy (heat). So, the higher the current, the higher the temperature of the wire. The cord insulation has a maximum temperature rating. Since the temperature of the wire is a function of the current, the cord current must be limited to a value that does not cause excessive insulation temperature. In terms of length, since the power is uniformly distributed, I see no reason to limit the length -- at least insofar as controlling the insulation temperature. The length of the cord will affect the voltage at the load end of the cord. The higher the current, the lower the voltage. I suppose a supply voltage being applied to the equipment that is below its rated voltage could cause overheating or some low- voltage induced fault in the equipment. This would imply a non-linear load of some sort, or a motor load. If this is the reason for the length restriction, I would much prefer the length restriction to be related to a specific load rather than to all loads. (Large-diameter cords are difficult to manage.) Best regards, Rich --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: Mains Cords in the UK and the fuse rating
Almost certainly the answer will be found in BS1363 Part 1, Specification for rewirable and non-rewirable 13A fused plugs. (I assume you are referring to UK plugs, as I don't know of any other plug with a fuse). My copy of BS1363 is rather old, but there is a table which shows a 3A (5A) fuse used with 0.5 sq mm cord, and 13A fuses used with 0.75, 1.0, 1.25 and 1.5 sq mm cord. A note states the figure in brackets indicates the fuse rating where a non-rewirable plug/cord assembly is used with certain types of equipment where the use of a 5A fuse-link is necessary because of the high instantaneous input current. So the answer to your question is yes, BS1363 specifies a 13A fuse for 0.75 sq mm cords. Regards, John Crabb, Development Excellence (Product Safety) , NCR Financial Solutions Group Ltd., Kingsway West, Dundee, Scotland. DD2 3XX E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. VoicePlus 6-341-2289. -Original Message- From: Chris Allen [mailto:chris_al...@eur.3com.com] Sent: 29 November 2001 14:14 To: emc-p...@majordomo.ieee.org Subject: Mains Cords in the UK and the fuse rating For an IT product there is a restriction in the use of mains cords with a cross sectional area of 0.75mm2 for units up to 6 amps when the cord is greater than 2m in length (EN60950: 2000 section 3.2.5) Can anyone tell me is there is a requirement (in any standard) specifying a maximum fuse rating that should be fitted to the plug of such a cord and what it is? Thanks in advance. Kind regards, Chris. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: Mains Cords in the UK and the fuse rating
I recommend that you get copies of BS 1362 and all parts of BS 1363 from BSI. You may also want to get a copy of EN 60799. Regards, +=+ |Ronald R. Wellman|Voice : 408-345-8229 | |Agilent Technologies |FAX : 408-553-2412 | |5301 Stevens Creek Blvd.,|E-Mail: ron_well...@agilent.com| |Mailstop 54L-BB |WWW : http://www.agilent.com | |Santa Clara, California 95052 USA| | +=+ | Common sense is the collection of prejudices acquired by age | | eighteen. - Albert Einstein | +=+ -Original Message- From: Chris Allen [mailto:chris_al...@eur.3com.com] Sent: Thursday, November 29, 2001 6:14 AM To: emc-p...@majordomo.ieee.org Subject: Mains Cords in the UK and the fuse rating For an IT product there is a restriction in the use of mains cords with a cross sectional area of 0.75mm2 for units up to 6 amps when the cord is greater than 2m in length (EN60950: 2000 section 3.2.5) Can anyone tell me is there is a requirement (in any standard) specifying a maximum fuse rating that should be fitted to the plug of such a cord and what it is? Thanks in advance. Kind regards, Chris. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Mains Cords in the UK and the fuse rating
I read in !emc-pstc that Chris Allen chris_al...@eur.3com.com wrote (in 80256b13.004f5079...@notesmta.eur.3com.com) about 'Mains Cords in the UK and the fuse rating', on Thu, 29 Nov 2001: For an IT product there is a restriction in the use of mains cords with a cross sectional area of 0.75mm2 for units up to 6 amps when the cord is greater than 2m in length (EN60950: 2000 section 3.2.5) This, AIUI, is based on requirements in USA and Continental Europe for the (6 A?) fuse in the consumer unit to operate correctly. A L-E fault current of at least 9 A must flow. Can anyone tell me is there is a requirement (in any standard) specifying a maximum fuse rating that should be fitted to the plug of such a cord and what it is? BS1363. It was Table 2 in the 1984 edition, but may have moved. In that edition, a 13 A fuse was allowed, but you should check with the latest edition. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. --- 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 Healddavehe...@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: No longer online until our new server is brought online and the old messages are imported into the new server.
