[Boatanchors] Article on changing from 2 to 3 wire power cords

John Duffield jaduffield at copper.net
Tue Aug 6 19:40:17 EDT 2019

I suspect we should make this a little broader in scope, don't you 
think??   The concept (design approach) of the AC/DC design of low-cost 
electronic equipment carries with it the understanding that this is a 
"hot chassis" design that is constructed to operate inside an insulated 
environment... plastic cabinet, plastic knobs, and the two-prong 
electric cord was designed to plug into the well-ordered AC socket 

There Is No  Chassis Ground to protect.

I suspect one might try to make it somewhat more orderly by putting a 
modern 2-blade AC plug on the two-conductor AC cord, but even that will 
only give the impression of a modern upgrade to some level of safety.  
The Chassis Is Still Hot.    What problem are we solving??


John  K0KHZ

On 8/6/2019 3:28 PM, Glen Zook wrote:
> I don't know of any article on doing this.  However, it is a very simple thing to do.
> Black wire goes first to the fuse and then to the off / on switch.  If no fuse, add one!
> White wire goes to unfused side of the power transformer.  If there is a fuse, it should be rewired in the black lead.  If 2-fuses, remove this one.
> Green wire goes directly to the chassis.
> Of course, this is with transformer powered units.
> If AC / DC, then things get "tricky" depending on if one side of the AC line cord is connected to the chassis.
> Glen, K9STH
> Website: https://k9sth.net
>      On Tuesday, August 6, 2019, 04:19:26 PM CDT, Maury Guzick <w5io at sbcglobal.net> wrote:
>   I have read a couple of different ones in the past, but can't seem to find any on data base searches.
> Does anyone have a reference for this?
> _______________________________________________
> Boatanchors mailing list
> Boatanchors at puck.nether.net
> https://puck.nether.net/mailman/listinfo/boatanchors
> ---
> This email has been checked for viruses by AVG.
> https://www.avg.com


More information about the Boatanchors mailing list