Jim, I am not sure why you suggested I check for paint under the mounting screws. IT IS bonded to the chassis and cannot be isolated.
I did not believe that the NEC applied but I was not sure about UL. Michael Blake k9...@mac.com > On Apr 18, 2018, at 14:28, Jim Brown <j...@audiosystemsgroup.com> wrote: > >> On 4/18/2018 11:10 AM, Michael Blake wrote: >> It seems that my newest Astron SS30 power supply does not allow for the >> negative post to be isolated from the chassis. The green wire can be >> disconnected from the chassis but the negative rail of the DC output can not >> be isolated from the chassis. The negative rail is firmly connected to the >> chassis via two of the circuit board mounting screws. Separation would only >> be possible by using insulating washers and nylon screws. > > That's unfortunate, and a good reason to avoid that supply. It IS an > absolute requirement of virtually all Electrical Codes (LAW) in North America > that the Green Wire be bonded to the shielding enclosure (chassis). I > suggest that you check that paint is not insulating the mounting screws fro > the shielding enclosure. >> >> This is not true in one of my older supplies. Has there been an NEC or UL >> change that requires that one side of the output of a DC supply be grounded? > > NEC does not apply to low voltage DC systems. > > 73, Jim K9YC > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k9...@mac.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
