[kwlug-disc] UPS recommendations?

[William Park]

Main issue I heard/read, is when you compress aluminium wire, it stays 
compressed (probably, copper has less such tendency).  So, when you 
screw in your aluminium wire in socket post, it's tight at first, but 
after while it gets loose and creates sparks.  That's why you hear 
buzzing sound.

Another reason, is difference between aluminium oxide (insulating) and 
copper oxide (conductive), though I don't know if it's significant at 
household level.

On 2024-07-27 01:25, Chris Frey wrote:
> On Fri, Jul 26, 2024 at 07:10:34PM -0400, Ron Singh wrote:
>> Recently-ish, a YT channel, "Mr. Carlson's Lab", did a repaid on an APC
>> BR1500xx UPS. To his surprise(and mine!), he found that the Copper leads
>> were horribly "soldered" to Aluminium windings! I checked a dead APC
>> BR1500MS2 at work and found the same was true of that model.
>> Thanks to that Carlson vid, no more APC consumer UPSeses used at my office.
> 
> Pardon my electrical ignorance here, but what's wrong with
> copper/aluminium mixing in this case?