"Michael A. Terrell" wrote in message
...


Look up the specs on the electrolytics used on the boards. Most have
a 2000 hour life rating at the specified temperature. After that, the
ESR starts to rise, causing the boards to fail.

83 days?????????


BTW, my background is in mission critical electronics.


It also assumes a good power system to avoid low and spike voltage
conditions.


Around machine tools?

Sure, why not?