If the feed to the sub-panel has 60 amp breakers in the main panel, then #6 AWG feed to the sub-panel is required by the NEC code. That you estimate at this time you do not ever use more than 20 amps out of the sub-panel has no bearing on the ampacity requirement for the sub-panel. A subsequent occupant of your property may chose to expand use of the sub-panel to the degree implied by the main panel breakers for the sub-.panel. The code is intended to protect future occupants as well.
73, Guy K2AV On Thu, Aug 11, 2016 at 12:38 PM, Clay Autery <[email protected]> wrote: > How do you define "necessary". > > Paraphrasing K9YC, Jim.... "Big wire is your friend". > > I agree... > > I typically use wire at least 2 sizes larger than "required".... Often > the wire size is determined by how big of a wire I can FIT in the > application and how much money I can part with at the time. > > For instance, on my current power project... I am running 6 AWG x 4 from > the service to the sub-panel @ 50 foot run for a 60 Amp separately > derived service where there'll never be more than about a 20 Amp total > demand... > > From the sub-panel to the receptacles about 3-1/2 feet below, I am using > 10 AWG.... only because that's the largest wire the receptacle > terminals are rated for. > > From the receptacles to all equipment, minimum 10 AWG... > > Bigger and shorter the wire, the better... > > ______________________ > Clay Autery, KY5G > MONTAC Enterprises > (318) 518-1389 > > On 8/11/2016 10:43 AM, Ronnie Hull wrote: > > Is 10 gauge necessary? > > > > Sent from my iPhone > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
