WOW! Thanks for that link! Now just to find it in PDF.
'73 de JIM N2ZZ -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mark Goldberg Sent: Monday, July 09, 2018 8:27 PM To: hawley, charles j jr Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] Breakers for KPA1500? Actually, if you look at the NEC (National Electrical Code), they have factors for ambient temp and wire temp ratings. Other codes around the world are similar. For example, if you use AWG 12 Type UF cable, the base rating is 20 Amps. With the temperatures we have in Arizona, where it can get above 140F in an attic, they have a correction factor of 0.71 if the wire is rated to 90C. So it should only be used up to 14.2 Amps. If you are installing from scratch, I would go to AWG 10 just for a safety factor. Of course, you may not be here in Arizona. It actually may get hotter than that here in some attics. You can read the NEC for free by going here and signing up. It will tell you more than you want to know, in excruciating detail. A copy will cost ya, but I have found the online interface good enough to find things. https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-cod es-and-standards/detail?code=70 73, Mark W7MLG On Mon, Jul 9, 2018 at 4:49 PM, hawley, charles j jr <c-haw...@illinois.edu> wrote: > How many watts of heat does the average attic have in the summertime? > > Chuck > KE9UW > > Sent from my iPhone, cjack > > > On Jul 9, 2018, at 6:39 PM, Josh Fiden <j...@voodoolab.com> wrote: > > > > If wire run ends up being 50' you could see a 2V drop at 13A. Agree that > switching supply in amp won't care. 26W of heat in the wire inside a wall > would bug me. > > > > 73 > > Josh W6XU > > > > Sent from my mobile device > > > >> On Jul 9, 2018, at 3:12 PM, Roy Koeppe <k...@ncn.net> wrote: > >> > >> The KPA1500 uses a regulated power supply: input 195 to 250 vac. > Voltage loss in #12 wires is so small the regulator will laugh at that. > >> > >> 73, Roy K6XK > >> > >> > >> "I would also suggest using three - #10 with ground as the line from > the > >> breakers to the amp operating position." > >> > >> 73 > >> > >> Bob, K4TAX > >> > >> > >>> On 7/9/2018 11:43 AM, Roy Koeppe wrote: > >>> Yes, that is what I am using. > >>> > >>> 73, Roy K6XK > >>> > >>> > >>> I probably missed this but my google searches aren't working either. > >>> > >>> Will 2x 20A breakers (220v) be sufficient for the KPA1500? > >>> > >>> > >> > >> > >> ______________________________________________________________ > >> Elecraft mailing list > >> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >> Help: http://mailman.qth.net/mmfaq.htm > >> Post: mailto:Elecraft@mailman.qth.net > >> > >> This list hosted by: http://www.qsl.net > >> Please help support this email list: http://www.qsl.net/donate.html > >> Message delivered to j...@voodoolab.com > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to c-haw...@illinois.edu > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to marklgoldb...@gmail.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to jboehne...@yahoo.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
