Black for ‘hot’ and white for ‘neutral’ really gets interesting when one steps from the shore onto recreational watercraft where for years that black wire was ‘hot’ on the 120 VAC system and the other black wire was the negative on the DC system. You can imagine the hilarity when these two were incorrectly identified.
Modern convention has the DC negative is yellow, but older boats are notoriously interesting to work on. Dale W5OHM > On Sep 15, 2015, at 8:20 AM, Charlie T, K3ICH <[email protected]> wrote: > > Seriously, it makes you wonder how the standard house wiring color code over > here in the colonies ever came up with black as the hot wire. > Green for ground makes sense though. > > 73, Charlie k3ICH > > > > -----Original Message----- > From: Elecraft [mailto:[email protected]] On Behalf Of Gary > Sent: Tuesday, September 15, 2015 8:46 AM > To: [email protected]; 'Richard Fjeld' <[email protected]>; 'Fred > Townsend' <[email protected]>; [email protected] > Subject: Re: [Elecraft] K3: reverse 12 volt supply > > What an interesting idea. Wonder why that has not become a standard? > > (grin) > > Gary > > -----Original Message----- > From: "[email protected]" <[email protected]> > Sent: 15/09/2015 10:18 PM > To: "'Richard Fjeld'" <[email protected]>; "'Fred Townsend'" > <[email protected]>; "[email protected]" > <[email protected]> > Subject: Re: [Elecraft] K3: reverse 12 volt supply > > I have an idea. Why not color code the wires so we know which one is positive > and which one is Ground (or neutral) ? Maybe make the positive lead red (like > hot, danger) and the other one anything, black, green... > Thoughts? > > > > > > > Notice: The above post is a weak attempt at humor, albiet sarcastic , and is > NOT INTENDED TO BE OFFENSIVE IN ANY WAY. > > Jerry Moore > AE4PB, K3S SN# TBA later TOMORROW!! > > -----Original Message----- > From: Elecraft [mailto:[email protected]] On Behalf Of Richard > Fjeld > Sent: Tuesday, September 15, 2015 1:02 AM > To: Fred Townsend; [email protected] > Subject: Re: [Elecraft] K3: reverse 12 volt supply > > It was a passing thought as; how to use a diode without causing a voltage > drop was the original question. > > AD5X has an OVP and Rev Polarity project on his website that would be better. > > I couldn't think of the call sign at the time, so I suggested a relay. > > (I've worked with huge contactors that were on motor-generators to prevent > run-aways) > > 73, > Dick, n0ce > > > > On 9/14/2015 5:13 PM, Fred Townsend wrote: >> Dick: >> Relays? Sure, easy to do. Power relays are often used in many kinds >> equipment. They are sometimes called 'contactors'. They are either big >> and clunky or small and unreliable. Which kind do you want and what >> are you willing to pay? >> 73 >> Fred, AE6QL >> >> >> > > ______________________________________________________________ > 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] > ______________________________________________________________ > 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] ______________________________________________________________ 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]
