Scott Dorsey wrote:
Richard Crowley wrote:

I wouldn't trust most "surge protectors" under those conditions.
I'd seriously consider UPS units for real isolation from line sags
and faults. IMHO, a cheap UPS offers more protection than an
expensive surge protector (assuming a REALLY EFFECTIVE,
no-hype "surge protector" even exists.)


Not really. You'd be surprised at just how little protection stuff is
in the typical standby UPS systems... and you're still connected directly
to the AC line until the power goes out and the relay cuts you over.


Put a 'scope on the output of your UPS sometime when it is running on
batteries. Check both normal and common-mode noise if you can. Be afraid.