[Elecraft] K3: reverse 12 volt supply

[Dale LeDoux]

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 <pincon at erols.com> 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:elecraft-bounces at mailman.qth.net] On Behalf Of Gary
> Sent: Tuesday, September 15, 2015 8:46 AM
> To: ae4pb at carolinaheli.com; 'Richard Fjeld' <rpfjeld at outlook.com>; 'Fred Townsend' <fptownsend at earthlink.net>; elecraft at mailman.qth.net
> 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: "ae4pb at carolinaheli.com" <ae4pb at carolinaheli.com>
> Sent: ‎15/‎09/‎2015 10:18 PM
> To: "'Richard Fjeld'" <rpfjeld at outlook.com>; "'Fred Townsend'" <fptownsend at earthlink.net>; "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
> 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:elecraft-bounces at mailman.qth.net] On Behalf Of Richard Fjeld
> Sent: Tuesday, September 15, 2015 1:02 AM
> To: Fred Townsend; elecraft at mailman.qth.net
> 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
>> 
>> 
>> 
> 
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