Re: [PSES] Wire ampacities -
. . . or wire in free air, or buried, depending on what table you look at. As as gut feel, I would say that 3 inches of 26AWG would have a very low temperature rise at 500mA, but as John stated, it's best to run a test. ___ Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: IBM Ken ibm...@gmail.com To: EMC-PSTC@LISTSERV.IEEE.ORG, Date: 09/04/2013 02:26 PM Subject: Re: [PSES] Wire ampacities - Ampacity charts (particularly in the NEC) may assume wire pulled in conduit, more than one current-carrying conductor, etc. You may be better off using a chart from your product Standard (60950 has something to say on this topic but it's a bit conservative).In your case, I would approach the agency with some thermal testing showing that you haven't exceeeded the insulation's temperature rating (assuming it has one) in the application and you continue to pass all the other requirements of your product standard. If it's not a ground wire I think they would be OK with this approach and some limited testing. -Ken On Wed, Sep 4, 2013 at 3:15 PM, McInturff, Gary gary.mcintu...@esterline.com wrote: I was just discussing the current handling capabilities of appliance wiring material and while I have a chart it is of unknown heritage and differs from some other reference material. For example the chart I have says 26AWG wire can handle about 0.25 amps, but when I look at the connector it says about 1 amp with a 26 AWG wire. I made a search for the NEC amperages but they I could find anything smaller (larger?) about 18 guage and it was primarily for power wiring. Can anybody give me a good reference for AWM current handling capabilities? The UL web-site seems pretty useless as well. Heck I think I talked one of their engineers out of the chart I have. My original supposition was that the wire insulation rating would be exceeded if X amps were run through Y gauge wire, and that was from a safety perspective the upper limit of current. I realized that impedance per/foot has implications on voltage drop etc, but in this case those things are moot. I just want to run 0.5 amps down a 26 AWG wire for about 3 inches at low frequency without overheating the insulation. Again one reference holds about ¼ amp, while another says 1 amp. . Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products 600 W. Wilbur Avenue Coeur d’Alene, ID 83815-9496 Toll Free: 800-444-5923 X1XXX Tel: (208) 635-8 Fax: (208) 635-8 www.esterline.com/interfacetechnologies Technology, Innovation, Performance… Information in or attached to this e-mail message may be subject to export control restrictions of the International Traffic in Arms Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information outside the United States or releasing it to a foreign person in the United States, you need to determine whether a license under the EAR or the ITAR is required to do so. If you have any questions about this obligation, please contact me. Click here to read disclaimer - 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 LT; emc-p...@ieee.orgGT; 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://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas LT;emcp...@radiusnorth.netGT; Mike Cantwell LT;mcantw...@ieee.orgGT; For policy questions, send mail to: Jim Bacher LT;j.bac...@ieee.orgGT; David Heald LT;dhe...@gmail.comGT; - 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://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list
Re: [PSES] Wire ampacities -
One should also consider the prospective short circuit current in that circuit if the standard requires single fault testing in that circuitry. (and even if it's not required) If your wire is connected to a 30 amp power supply it's quite a different story as when it's fed by a 1Amp regulator. Regards, Ing. Gert Gremmen, BSc Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens Ted Eckert Verzonden: Thursday, September 05, 2013 12:09 AM Aan: EMC-PSTC@LISTSERV.IEEE.ORG Onderwerp: RE: Wire ampacities - A few of the wire vendors have reference charts that may be of use. The link to one example is below. http://www.alphawire.com/en/EngineersRoom/ReferenceTables/CurrentRatings http://www.alphawire.com/en/EngineersRoom/ReferenceTables/CurrentRatings This chart should give a rough idea of the temperature change of wires at different ampacities. This table makes general assumptions about wire resistance and insulation thickness, so assume that the actual temperature rise will vary a bit more. Ted Eckert Compliance Engineer Microsoft Corporation ted.eck...@microsoft.com mailto:ted.eck...@microsoft.com The opinions expressed are my own and do not necessarily reflect those of my employer. From: IBM Ken [mailto:ibm...@gmail.com] Sent: Wednesday, September 4, 2013 2:22 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: Wire ampacities - Ampacity charts (particularly in the NEC) may assume wire pulled in conduit, more than one current-carrying conductor, etc. You may be better off using a chart from your product Standard (60950 has something to say on this topic but it's a bit conservative).In your case, I would approach the agency with some thermal testing showing that you haven't exceeeded the insulation's temperature rating (assuming it has one) in the application and you continue to pass all the other requirements of your product standard. If it's not a ground wire I think they would be OK with this approach and some limited testing. -Ken On Wed, Sep 4, 2013 at 3:15 PM, McInturff, Gary gary.mcintu...@esterline.com wrote: I was just discussing the current handling capabilities of appliance wiring material and while I have a chart it is of unknown heritage and differs from some other reference material. For example the chart I have says 26AWG wire can handle about 0.25 amps, but when I look at the connector it says about 1 amp with a 26 AWG wire. I made a search for the NEC amperages but they I could find anything smaller (larger?) about 18 guage and it was primarily for power wiring. Can anybody give me a good reference for AWM current handling capabilities? The UL web-site seems pretty useless as well. Heck I think I talked one of their engineers out of the chart I have. My original supposition was that the wire insulation rating would be exceeded if X amps were run through Y gauge wire, and that was from a safety perspective the upper limit of current. I realized that impedance per/foot has implications on voltage drop etc, but in this case those things are moot. I just want to run 0.5 amps down a 26 AWG wire for about 3 inches at low frequency without overheating the insulation. Again one reference holds about ¼ amp, while another says 1 amp. . Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products 600 W. Wilbur Avenue Coeur d'Alene, ID 83815-9496 Toll Free: 800-444-5923 X1XXX Tel: (208) 635-8 Fax: (208) 635-8 www.esterline.com/interfacetechnologies Technology, Innovation, Performance... Information in or attached to this e-mail message may be subject to export control restrictions of the International Traffic in Arms Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information outside the United States or releasing it to a foreign person in the United States, you need to determine whether a license under the EAR or the ITAR is required to do so. If you have any questions about this obligation, please contact me. Click here http://www.esterline.com/governance/email_disclaimer/tabid/1532/Default.aspx to read disclaimer - 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 LT;emc-p...@ieee.orgGT; 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.
[PSES] Wire ampacities -
I was just discussing the current handling capabilities of appliance wiring material and while I have a chart it is of unknown heritage and differs from some other reference material. For example the chart I have says 26AWG wire can handle about 0.25 amps, but when I look at the connector it says about 1 amp with a 26 AWG wire. I made a search for the NEC amperages but they I could find anything smaller (larger?) about 18 guage and it was primarily for power wiring. Can anybody give me a good reference for AWM current handling capabilities? The UL web-site seems pretty useless as well. Heck I think I talked one of their engineers out of the chart I have. My original supposition was that the wire insulation rating would be exceeded if X amps were run through Y gauge wire, and that was from a safety perspective the upper limit of current. I realized that impedance per/foot has implications on voltage drop etc, but in this case those things are moot. I just want to run 0.5 amps down a 26 AWG wire for about 3 inches at low frequency without overheating the insulation. Again one reference holds about ¼ amp, while another says 1 amp. . Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products 600 W. Wilbur Avenue Coeur d'Alene, ID 83815-9496 Toll Free: 800-444-5923 X1XXX Tel: (208) 635-8 Fax: (208) 635-8 www.esterline.com/interfacetechnologieshttp://www.esterline.com/interfacetechnologies Technology, Innovation, Performance... Information in or attached to this e-mail message may be subject to export control restrictions of the International Traffic in Arms Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information outside the United States or releasing it to a foreign person in the United States, you need to determine whether a license under the EAR or the ITAR is required to do so. If you have any questions about this obligation, please contact me. Click herehttp://www.esterline.com/governance/email_disclaimer/tabid/1532/Default.aspx to read disclaimer - 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://listserv.ieee.org/request/user-guide.html 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
Re: [PSES] Wire ampacities -
In message d250d01e39356a4e9cc3b4b459d6655097de0...@ms-cda-01.advanced-input.com, dated Wed, 4 Sep 2013, McInturff, Gary gary.mcintu...@esterline.com writes: I just want to run 0.5 amps down a 26 AWG wire for about 3 inches at low frequency without overheating the insulation. Again one reference holds about ¼ amp, while another says 1 amp. You are right that this subject can be very confusing. The lowest ratings are usually those based on voltage drop. Those based on temperature rise naturally depend on how the wire can cool, and what the ambient temperature is assumed to be, but they don't always say so. I have found that the only reliable way to get the data is to actually do a test. But for 3 inches of wire, it may be difficult to use the resistance method to determine the wire temperature. These days, it isn't difficult to knock up a milliohm-meter or something even more sensitive. You don't need huge accuracy. -- 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://listserv.ieee.org/request/user-guide.html 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
Re: [PSES] Wire ampacities -
From: McInturff, Gary Sent: Wednesday, September 04, 2013 12:16 I was just discussing the current handling capabilities of appliance wiring material and while I have a chart it is of unknown heritage and differs from some other reference material. For example the chart I have says 26AWG wire can handle about 0.25 amps, but when I look at the connector it says about 1 amp with a 26 AWG wire. AWM will have a temperature rating associated with each wire style and might be surface marked on the wire insulation. The ampacity of AWM is such that its measured temperature does not exceed the temperature rating for the wire style while carrying the intended current, barring any extenuating circumstances like exceeding the temperature allowed in a certain area of a product due to material constraints, hazardous atmospheres, or routing through an area in the equipment operating at an elevated temperature, etc. Regards, Peter Tarver This email message is for the sole use of the intended recipient(s) and may contain confidential and/or privileged information. If you are not an intended recipient, you may not review, use, copy, disclose or distribute this message. If you received this message in error, please contact the sender by reply email and destroy all copies of the original message. - 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://listserv.ieee.org/request/user-guide.html 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
Re: [PSES] Wire ampacities -
Ampacity charts (particularly in the NEC) may assume wire pulled in conduit, more than one current-carrying conductor, etc. You may be better off using a chart from your product Standard (60950 has something to say on this topic but it's a bit conservative).In your case, I would approach the agency with some thermal testing showing that you haven't exceeeded the insulation's temperature rating (assuming it has one) in the application and you continue to pass all the other requirements of your product standard. If it's not a ground wire I think they would be OK with this approach and some limited testing. -Ken On Wed, Sep 4, 2013 at 3:15 PM, McInturff, Gary gary.mcintu...@esterline.com wrote: I was just discussing the current handling capabilities of appliance wiring material and while I have a chart it is of unknown heritage and differs from some other reference material. For example the chart I have says 26AWG wire can handle about 0.25 amps, but when I look at the connector it says about 1 amp with a 26 AWG wire. I made a search for the NEC amperages but they I could find anything smaller (larger?) about 18 guage and it was primarily for power wiring. Can anybody give me a good reference for AWM current handling capabilities? The UL web-site seems pretty useless as well. Heck I think I talked one of their engineers out of the chart I have. My original supposition was that the wire insulation rating would be exceeded if X amps were run through Y gauge wire, and that was from a safety perspective the upper limit of current. I realized that impedance per/foot has implications on voltage drop etc, but in this case those things are moot. I just want to run 0.5 amps down a 26 AWG wire for about 3 inches at low frequency without overheating the insulation. Again one reference holds about ¼ amp, while another says 1 amp. ** ** ** ** ** ** . Gary McInturff Reliability/Compliance Engineer ** ** ** ** ** ** ** ** *Esterline Interface Technologies*** *Featuring * *ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products* 600 W. Wilbur Avenue Coeur d’Alene, ID 83815-9496 Toll Free: 800-444-5923 X1XXX Tel: (208) 635-8 Fax: (208) 635-8 ** ** www.esterline.com/interfacetechnologies ** ** *Technology, Innovation, Performance…* Information in or attached to this e-mail message may be subject to export control restrictions of the International Traffic in Arms Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information outside the United States or releasing it to a foreign person in the United States, you need to determine whether a license under the EAR or the ITAR is required to do so. If you have any questions about this obligation, please contact me. ** ** Click herehttp://www.esterline.com/governance/email_disclaimer/tabid/1532/Default.aspxto read disclaimer ** ** ** ** ** - 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 LT; emc-p...@ieee.orgGT; 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://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas LT;emcp...@radiusnorth.netGT; Mike Cantwell LT;mcantw...@ieee.orgGT; For policy questions, send mail to: Jim Bacher LT;j.bac...@ieee.orgGT; David Heald LT;dhe...@gmail.comGT; - 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://listserv.ieee.org/request/user-guide.html 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
Re: [PSES] Wire ampacities -
Well maybe I'm at the bottom of the mess after a one of UL's wire subject matter experts called. I was under the same impression that Peter states below (or at least my interpretation of what your trying to tell me Peter.) I was assuming that somewhere in the recognition, listing, or certification of the wire, one of the tested/controlled parameters would be current flow through the wire that would heat it to the point that the insulation temperature rating was being reached or exceeded. Sounds logical but it isn't the case for AWM. As John W points out the designers first determine the wire gauge impedance/unit values and calculate the voltage drop across the length of wire and determine whether or not that gauge wire would allow proper operation of the circuit. That doesn't directly relate to the I squared heating of the wire, although it may produce a conservative number - just guessing here. If there is any concern then the conductor material would be measured to determi! ne the temperature of the conductor relative to the insulation temperature ratings. The end product safety evaluator does exactly the same thing - if concerned they will measure it, rather than comparing it to some maximum allowable current. Again I was led down the primrose path because it just made sense that the number would exist from the safety agencies when they were qualifying the wire, other components that attach to the wire has identified maximum current ratings, the NEC has maximum ratings, and damn it, it just made sense. The various wire rating charts that might be found on line are assuming lots of different safety factors but they are not based on safety standards. Long story, confusion on my part, but easily resolvable, first make it work electrically and if concerned measure the conductor, change gauges until you're happy with both. By the way one of our fellow list members did direct me to UL 508 control panels and that standard in fact listed maximum current ratings for wire guage, but that seems to be an oddity. Thanks to the member that point it out. And thanks to those that gave up their time and knowledge in helping me dig my head out of Gary -Original Message- From: Peter Tarver [mailto:ptar...@enphaseenergy.com] Sent: Wednesday, September 04, 2013 12:55 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Wire ampacities - From: McInturff, Gary Sent: Wednesday, September 04, 2013 12:16 I was just discussing the current handling capabilities of appliance wiring material and while I have a chart it is of unknown heritage and differs from some other reference material. For example the chart I have says 26AWG wire can handle about 0.25 amps, but when I look at the connector it says about 1 amp with a 26 AWG wire. AWM will have a temperature rating associated with each wire style and might be surface marked on the wire insulation. The ampacity of AWM is such that its measured temperature does not exceed the temperature rating for the wire style while carrying the intended current, barring any extenuating circumstances like exceeding the temperature allowed in a certain area of a product due to material constraints, hazardous atmospheres, or routing through an area in the equipment operating at an elevated temperature, etc. Regards, Peter Tarver This email message is for the sole use of the intended recipient(s) and may contain confidential and/or privileged information. If you are not an intended recipient, you may not review, use, copy, disclose or distribute this message. If you received this message in error, please contact the sender by reply email and destroy all copies of the original message. - 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://listserv.ieee.org/request/user-guide.html 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
Re: [PSES] Wire ampacities -
A few of the wire vendors have reference charts that may be of use. The link to one example is below. http://www.alphawire.com/en/EngineersRoom/ReferenceTables/CurrentRatings This chart should give a rough idea of the temperature change of wires at different ampacities. This table makes general assumptions about wire resistance and insulation thickness, so assume that the actual temperature rise will vary a bit more. Ted Eckert Compliance Engineer Microsoft Corporation ted.eck...@microsoft.commailto:ted.eck...@microsoft.com The opinions expressed are my own and do not necessarily reflect those of my employer. From: IBM Ken [mailto:ibm...@gmail.com] Sent: Wednesday, September 4, 2013 2:22 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: Wire ampacities - Ampacity charts (particularly in the NEC) may assume wire pulled in conduit, more than one current-carrying conductor, etc. You may be better off using a chart from your product Standard (60950 has something to say on this topic but it's a bit conservative).In your case, I would approach the agency with some thermal testing showing that you haven't exceeeded the insulation's temperature rating (assuming it has one) in the application and you continue to pass all the other requirements of your product standard. If it's not a ground wire I think they would be OK with this approach and some limited testing. -Ken On Wed, Sep 4, 2013 at 3:15 PM, McInturff, Gary gary.mcintu...@esterline.commailto:gary.mcintu...@esterline.com wrote: I was just discussing the current handling capabilities of appliance wiring material and while I have a chart it is of unknown heritage and differs from some other reference material. For example the chart I have says 26AWG wire can handle about 0.25 amps, but when I look at the connector it says about 1 amp with a 26 AWG wire. I made a search for the NEC amperages but they I could find anything smaller (larger?) about 18 guage and it was primarily for power wiring. Can anybody give me a good reference for AWM current handling capabilities? The UL web-site seems pretty useless as well. Heck I think I talked one of their engineers out of the chart I have. My original supposition was that the wire insulation rating would be exceeded if X amps were run through Y gauge wire, and that was from a safety perspective the upper limit of current. I realized that impedance per/foot has implications on voltage drop etc, but in this case those things are moot. I just want to run 0.5 amps down a 26 AWG wire for about 3 inches at low frequency without overheating the insulation. Again one reference holds about ¼ amp, while another says 1 amp. . Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products 600 W. Wilbur Avenue Coeur d'Alene, ID 83815-9496 Toll Free: 800-444-5923tel:800-444-5923 X1XXX Tel: (208) 635-8 Fax: (208) 635-8 www.esterline.com/interfacetechnologieshttp://www.esterline.com/interfacetechnologies Technology, Innovation, Performance... Information in or attached to this e-mail message may be subject to export control restrictions of the International Traffic in Arms Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information outside the United States or releasing it to a foreign person in the United States, you need to determine whether a license under the EAR or the ITAR is required to do so. If you have any questions about this obligation, please contact me. Click herehttp://www.esterline.com/governance/email_disclaimer/tabid/1532/Default.aspx to read disclaimer - 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 LT;emc-p...@ieee.orgmailto:emc-p...@ieee.orgGT; 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://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas LT;emcp...@radiusnorth.netmailto:emcp...@radiusnorth.netGT; Mike Cantwell LT;mcantw...@ieee.orgmailto:mcantw...@ieee.orgGT; For policy questions, send mail to: Jim Bacher LT;j.bac...@ieee.orgmailto:j.bac...@ieee.orgGT; David Heald LT;dhe...@gmail.commailto:dhe...@gmail.comGT; - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your
Re: [PSES] Wire ampacities -
With that short a conductor length, you might get some significant conductive cooling axially through the copper. Mike Sherman Product Safety and Compliance Engineer Graco Inc. - Original Message - From: IBM Ken ibm...@gmail.com To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Wednesday, September 4, 2013 4:22:06 PM Subject: Re: [PSES] Wire ampacities - Ampacity charts (particularly in the NEC) may assume wire pulled in conduit, more than one current-carrying conductor, etc. You may be better off using a chart from your product Standard (60950 has something to say on this topic but it's a bit conservative). In your case, I would approach the agency with some thermal testing showing that you haven't exceeeded the insulation's temperature rating (assuming it has one) in the application and you continue to pass all the other requirements of your product standard. If it's not a ground wire I think they would be OK with this approach and some limited testing. -Ken On Wed, Sep 4, 2013 at 3:15 PM, McInturff, Gary gary.mcintu...@esterline.com wrote: I was just discussing the current handling capabilities of appliance wiring material and while I have a chart it is of unknown heritage and differs from some other reference material. For example the chart I have says 26AWG wire can handle about 0.25 amps, but when I look at the connector it says about 1 amp with a 26 AWG wire. I made a search for the NEC amperages but they I could find anything smaller (larger?) about 18 guage and it was primarily for power wiring. Can anybody give me a good reference for AWM current handling capabilities? The UL web-site seems pretty useless as well. Heck I think I talked one of their engineers out of the chart I have. My original supposition was that the wire insulation rating would be exceeded if X amps were run through Y gauge wire, and that was from a safety perspective the upper limit of current. I realized that impedance per/foot has implications on voltage drop etc, but in this case those things are moot. I just want to run 0.5 amps down a 26 AWG wire for about 3 inches at low frequency without overheating the insulation. Again one reference holds about ¼ amp, while another says 1 amp. . Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products 600 W. Wilbur Avenue Coeur d’Alene, ID 83815-9496 Toll Free: 800-444-5923 X1XXX Tel: (208) 635-8 Fax: (208) 635-8 www.esterline.com/interfacetechnologies Technology, Innovation, Performance… Information in or attached to this e-mail message may be subject to export control restrictions of the International Traffic in Arms Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information outside the United States or releasing it to a foreign person in the United States, you need to determine whether a license under the EAR or the ITAR is required to do so. If you have any questions about this obligation, please contact me. Click here to read disclaimer - 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 LT; emc-p...@ieee.org GT; 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://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas LT; emcp...@radiusnorth.net GT; Mike Cantwell LT; mcantw...@ieee.org GT; For policy questions, send mail to: Jim Bacher LT; j.bac...@ieee.org GT; David Heald LT; dhe...@gmail.com GT; - 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 LT; emc-p...@ieee.org GT; 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://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas LT; emcp
