Breakers for KPA1500?
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I based that statement on the 20amp KPA1500 rating shown on page 28 of
their manual. Obviously this is incorrect or it is very inefficient, but still a station can have multiple heavy duty rotators, computers, multiple transceivers, etc. http://www.elecraft.com/manual/E740301%20KPA1500%20Owners%20Manual%20Rev%20A8.pdf John KK9A Jim Brown jim at audiosystemsgroup.com On 7/10/2018 9:13 AM, john at kk9a.com wrote: > Yes you can run three conductor > Romex and have a 120v and 240v outlet but I do not see this as a good plan > as it could easily exceed 20 amps on one leg. Upgrading to higher amperage > circuit and you'll exceed the amperage rating for a standard 120v outlet. > Two separate circuits are much easier to manage. It's hard to imagine how 20A on a 240V circuit split to 120V outlets (with neutral) could be exceeded in a single operator ham station running legal power, and powering only ham gear from that circuit. Let's say that the power amp is drawing 15A keydown. That's 3.6kW, and you still have 5A at 120V on each of the two legs. Now, let's say that you have an Astron 14.4V supply running on one of those outlets powering a tranceiver, even two or three tranceivers, only one of them TX at a time. I find it hard to believe that the Astron draws more than 3A, probably less. Add an old big iron computer to the other leg, maybe 1A on that leg. Indeed, a second power amp could be running off that circuit as long as only one is in TX mode at a time! 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Per the manual 50% efficiency. So at 1500 watts output the. input would be abt 3Kw. A 20 amp ckt at 240 V would supply 4.8 Kw. Seems reasonable to have adequate power for other equipment.
Bob, K4TAX Sent from my iPhone > On Jul 10, 2018, at 12:34 PM, "[hidden email]" <[hidden email]> wrote: > > I based that statement on the 20amp KPA1500 rating shown on page 28 of > their manual. Obviously this is incorrect or it is very inefficient, but > still a station can have multiple heavy duty rotators, computers, multiple > transceivers, etc. > > http://www.elecraft.com/manual/E740301%20KPA1500%20Owners%20Manual%20Rev%20A8.pdf > > John KK9A > > > Jim Brown jim at audiosystemsgroup.com > >> On 7/10/2018 9:13 AM, john at kk9a.com wrote: >> Yes you can run three conductor >> Romex and have a 120v and 240v outlet but I do not see this as a good plan >> as it could easily exceed 20 amps on one leg. Upgrading to higher amperage >> circuit and you'll exceed the amperage rating for a standard 120v outlet. >> Two separate circuits are much easier to manage. > > It's hard to imagine how 20A on a 240V circuit split to 120V outlets > (with neutral) could be exceeded in a single operator ham station > running legal power, and powering only ham gear from that circuit. Let's > say that the power amp is drawing 15A keydown. That's 3.6kW, and you > still have 5A at 120V on each of the two legs. Now, let's say that you > have an Astron 14.4V supply running on one of those outlets powering a > tranceiver, even two or three tranceivers, only one of them TX at a > time. I find it hard to believe that the Astron draws more than 3A, > probably less. Add an old big iron computer to the other leg, maybe 1A > on that leg. Indeed, a second power amp could be running off that > circuit as long as only one is in TX mode at a time! > > 73, Jim K9YC > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by john@kk9a.com
John,
Just because the Specification says 20 amps, that is the maximum current draw for the amp - it does not say that the breaker must be 20 amps, only that it must be 20 amps or higher. A 30 amp breaker is fine if the wire is #10 or larger. Think about what you normally plug into a 120 volt 15 amp receptacle - does it always draw 15 amps? Certainly a hair dryer might, but your cellphone charger does not. 73, Don W3FPR On 7/10/2018 1:34 PM, [hidden email] wrote: > I based that statement on the 20amp KPA1500 rating shown on page 28 of > their manual. Obviously this is incorrect or it is very inefficient, but > still a station can have multiple heavy duty rotators, computers, multiple > transceivers, etc. > > http://www.elecraft.com/manual/E740301%20KPA1500%20Owners%20Manual%20Rev%20A8.pdf > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Breakers for KPA1500?
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Code generally says 12 amps max on a 15 amp circuit.
On 7/10/2018 11:42 AM, Don Wilhelm wrote: > Think about what you normally plug into a 120 volt 15 amp receptacle - > does it always draw 15 amps? Certainly a hair dryer might, but your > cellphone charger does not. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Ladies and Gentlemen,
As a *Recovering Regulator* and a person who contacted my insurance company when I was contemplating finishing my basement, let me share a couple thoughts/experiences. A couple of years ago I called my home owners insurance company, USAA, and told the nice young lady who answered the phone that I thought building permit fees were just another tax and asked her if it would be acceptable to the insurance company if I hired contractors for the electrical, plumbing, heating, etc. work and specified in the contracts that all work would be performed to currant code. Her response was that they really did not care what I did unless there was a catastrophe. In which case if the cause of the catastrophe was traced to uninspected work, I was not insured. Not sure if this is still the case, but a few years ago the Trustees of the Town of Deertrail, Colorado put in place a system where a person could bring a description or sketch of proposed work written on anything, including a bar napkin from the VFW hall, to the Town Clerks office and be issued a building permit. For a fee of $2.00 you could have the work inspected by the Mayor/Building inspector when he was in town, since he was a long haul trucker he was frequently on the road but would do the inspection when he got back. Since most jurisdictions are more formal than Deertrail, I would recommend talking with the people in your local jurisdiction to learn the local requirements. Or as my Business Law professor said, "The expensive professional advice is always cheaper than fixing the problem(s) we create by not knowing the rules and regulations." Lee N0RRL On Tue, Jul 10, 2018 at 12:50 PM, Lynn W. Taylor, WB6UUT < [hidden email]> wrote: > Code generally says 12 amps max on a 15 amp circuit. > > On 7/10/2018 11:42 AM, Don Wilhelm wrote: > >> Think about what you normally plug into a 120 volt 15 amp receptacle - >> does it always draw 15 amps? Certainly a hair dryer might, but your >> cellphone charger does not. >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Don Wilhelm
Ok... I can’t stand it any longer.
The breaker you install has nothing whatsoever to do with the equipment your going to use on that circuit. The breaker is chosen for the size of the wire you run in the walls. PERIOD!!! The amp is protected by the fuses in the amp! Not the circuit breaker. The only thing protected by the breaker is the wire use in that circuit. If you have a 50amp 240 v circuit, FINE! The amp will use what it needs. The fuses will protect it from overdraw of current. The circuit breaker will protect the wire to the receptacle. PERIOD! If you don’t know this you should hire an electrician. PERIOD! Talk about a thread that’s gone on too long! Ron Genovesi N3ETA Sent from my iPhone > On Jul 10, 2018, at 11:42 AM, Don Wilhelm <[hidden email]> wrote: > > John, > > Just because the Specification says 20 amps, that is the maximum current draw for the amp - it does not say that the breaker must be 20 amps, only that it must be 20 amps or higher. > A 30 amp breaker is fine if the wire is #10 or larger. > > Think about what you normally plug into a 120 volt 15 amp receptacle - does it always draw 15 amps? Certainly a hair dryer might, but your cellphone charger does not. > > 73, > Don W3FPR > >> On 7/10/2018 1:34 PM, [hidden email] wrote: >> I based that statement on the 20amp KPA1500 rating shown on page 28 of >> their manual. Obviously this is incorrect or it is very inefficient, but >> still a station can have multiple heavy duty rotators, computers, multiple >> transceivers, etc. >> http://www.elecraft.com/manual/E740301%20KPA1500%20Owners%20Manual%20Rev%20A8.pdf > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: Breakers for KPA1500? [Thread closed]
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Folks -lets end the breakers for KPA1500thread to relieve list overload for our other readers.
Thread closed. 73, Eric Moderator from time to time.. elecraft.com _..._ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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