Hello outlaws,

I do have this question and couldn't find a definitive answer on the web (maybe I didn't search hard enough...).
What's the tolerance of the regular household voltage in US?
+/- what?
My PS Audio Duet power conditioner started to go crazy lately and shut off "out of the blue". A closer inspection showed that it does that when the voltage is 127V and works nicely below this threshold.
Now I need to know whether the Duet, which has over and under voltage protection, operates within normal ranges and I should take the issue with PECO Energy or 127V is OK and I have to address this with PS Audio.
Does anyone know that the standard is, please?

Thank you very much,
Alex