Zulu Posted April 30, 2022 Report Share Posted April 30, 2022 Can someone steer me to such a chart. I'm interested in stranded copper rated at 105 C. Quote SKP #79313 / Full-Timing / 2001 National RV Sea View / 2008 Jeep Wrangler Rubiconwww.rvSeniorMoments.comDISH TV for RVs Link to comment Share on other sites More sharing options...
William Anderson Posted April 30, 2022 Report Share Posted April 30, 2022 Web site with wire size vs amp chart. https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html William Quote Link to comment Share on other sites More sharing options...
sahively Posted April 30, 2022 Report Share Posted April 30, 2022 https://www.bluesea.com/resources/1437 Quote Link to comment Share on other sites More sharing options...
oldjohnt Posted April 30, 2022 Report Share Posted April 30, 2022 Thers a ton of them out there, when I practiced I just used the NEC but had plenty of other shorter basic references such as Uglys. HOWEVER what most non electricians or non engineers may not realize THE AMPACITY DEPENDS ON MANY FACTORS OTHER THEN THE WIRE SIZE ALONE. It has to do with how much current can be carried WITHOUT DEGRADING OR HARMING OR MELTING THE INSULATION IE how well heat can be dissipated from the conductors to the surroundings For example a conductor in free air has a much higher ampacity then one enclosed or jacketed and if enclosed how many conductors in what size raceway plus the type and class of Insulation etc etc etc on and on lol its worse then reading a law book. Regardless, when it comes to sizing low voltage DC conductors in high current applications such as for inverters or chargers, bigger is better to reduce line voltage drop which is a function of Current,,,,,,,Wire Size,,,,,,,,Distance Best wishes yall John T Quote Link to comment Share on other sites More sharing options...
Randyretired Posted April 30, 2022 Report Share Posted April 30, 2022 (edited) Just one more thing to consider. Many of us use welding wire which has very high temperature ratings but most terminals unless marked are not rated for high temperatures. To account for this the wire capacity needs to be derated for the terminal temperature rating. Fuses for instance do not play well with high temperatures. Blue Sea has an app that helps to size wire for fuses and other conditions. Edited April 30, 2022 by Randyretired Quote Randy 2001 Volvo VNL 42 Cummins ISX Autoshift Link to comment Share on other sites More sharing options...
Ray,IN Posted May 8, 2022 Report Share Posted May 8, 2022 The number of plugs/connections in a specific wire size also affects the outcome. Somewhat like the number of elbows in a water line affects total flow. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
GlennWest Posted May 8, 2022 Report Share Posted May 8, 2022 On 4/30/2022 at 3:52 PM, Randyretired said: Just one more thing to consider. Many of us use welding wire which has very high temperature ratings but most terminals unless marked are not rated for high temperatures. To account for this the wire capacity needs to be derated for the terminal temperature rating. Fuses for instance do not play well with high temperatures. Blue Sea has an app that helps to size wire for fuses and other conditions. My tig rig that i weld with uses #4 cable. I run at 250-290 amps with it for hours, gets warm but that's all. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
oldjohnt Posted May 8, 2022 Report Share Posted May 8, 2022 25 minutes ago, GlennWest said: My tig rig that i weld with uses #4 cable. I run at 250-290 amps with it for hours, gets warm but that's all. As I discussed above, a single conductor IN FREE AIR has a higher ampacity versus if enclosed. Again it has to do with the ability to dissipate heat without degrading the insulation.... John T Quote Link to comment Share on other sites More sharing options...
Randyretired Posted May 8, 2022 Report Share Posted May 8, 2022 Determining wire capacity is a complicated process because so many factors need to be considered. This is one description that helps to explain some of the factors. https://iaeimagazine.org/features/wire-temperature-ratings-and-terminations Quote Randy 2001 Volvo VNL 42 Cummins ISX Autoshift Link to comment Share on other sites More sharing options...
Zulu Posted May 9, 2022 Author Report Share Posted May 9, 2022 FYI - OP here. I ended up just asking the vendor. Quote SKP #79313 / Full-Timing / 2001 National RV Sea View / 2008 Jeep Wrangler Rubiconwww.rvSeniorMoments.comDISH TV for RVs Link to comment Share on other sites More sharing options...
oldjohnt Posted May 9, 2022 Report Share Posted May 9, 2022 Here's even more NEC Ampacity data: NECAmpacityWorkflow.pdf (nfpa.org) Back in the day I spent hours wading through all that stuff lol The NEC was our Bible John T Quote Link to comment Share on other sites More sharing options...
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