Ron. Did you read your citation before posting it? Where is the reference to common mode protection? Where are any numbers that apply to common mode protection? Once APC used to provide far more numbers when they claimed to protect from Normal mode transients. Now they don't even make those claims. Numbers provided by Ron's citation:
Hell. They don't even list dBs for the noise filter. What kind of spec is that? Noise filter for what? Incoming AC line? Output power line? Clearly these are specs for the technically naive.
After one surge, the entire UPS is toast? Look at those pathetic numbers. Only 160 joules? Only 6500 amps? Effective protection starts at about 1000 joules and 50,000 amps. Thank you Ron for demonstrating pathetic protection from that plug-in UPS.
Oh - where do they mention anything about 'faraday cage' protection?
In the meantime, Ron describes normal mode protection:
Where is the comm>> Ok sir. Explain to us how a plug-in UPS provides common mode