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Again and to be clear. Wall receptacle safety ground is not earth ground. For example, put a tester on that wall receptacle (to test for a missing ground). Then disconnect earth ground electrodes. That tester will not report any change. Because wall receptacle safety ground is a ground electrically different from earth ground. Put numbers to it. To be effective, a protector must connect low impedance (ie less than 3 meters) to earthing electrodes. But another reason why safety ground does nothing to make a protector effective. Why must plug-in (Type 3) protectors be more than 10 meters from the main breaker box and earth ground? Being too close to earth ground makes them a threat to human life. Type 3 (plug-in) protector must be far away from earth ground so as to not be earthed. So as to be a much less threat to human life. So many reasons why safety ground is not earth ground. A protector, without a low impedance (ie hardwire has no sharp bends or splices) connection the EARTH ground, is ineffective protection. Those receptacles in Switzerland only provide a safety ground; to only protect humans; not protect appliances.

So you saw a failure. Did not discover the mistake that caused that failure. Just fixed what should have never gone bad. We routinely traced a reason for failure. Even had to submit conclusions to a design review. No outage must make repair necessary. As required so many decades ago. For example, they left a computer on for months. When they turned it off, it failed to power on. So they (using subjective logic) concluded that power cycling can be bad for computers. Then I took the replaced PSU. Discovered a bootstrap resistor had failed (maybe months earlier). That resistor had only one function: to start a PSU. That failure was due to many hours of operation (combined with a manufacturing defect). Not due to a conclusion justified only by observation. They made a conclusion only from observation - as you have. You did not fix the defect. Since services and controller must never be damaged by (what is only rumored to be) unstable power. What number defines unstable power? Perspective (ie numbers) is always included in a conclusion. Again, a conclusion only from observation. Outages must never harm hardware or saved data. If it does, then informed techs locate and eliminate that defect. Never just cure symptoms. Again, voltage must drop so low that incandescent bulbs dim to less than 50% intensity. For computers, that number is 40%. If your voltage is dropping that low, then fix the defect. Since a voltage that low is a greater threat to less robust appliances (ie central air, refrigerator, furnace, dishwasher). Why fix a symptom and ignore the defect? UPS is cleaner power? Another urban myth promoted by conclusions only from observation. Learn what really exists. An AC utility demonstrates typical AC mains power (in a first waveform) followed by power from a UPS battery in following waveforms. What is 'dirtiest' power? From a UPS. Don't take my word for it. View waveforms here ( https://www.duke-energy.com/energy-education/power-quality/tech-tips ) by selecting Tech Tip 3. BTW, that 'dirty' UPS power is also called "pure sine waves". We learned this in high school math. Those waveforms are nothing more than a sum of pure sine waves. Another example of how many are so easily scammed when not first learning how reality works. Cleaner power from a UPS is often promoted subjectively. Too many then make conclusions only from observation or speculation. Any conclusion from observation is classic junk science reasoning. Fix the reason for services and controllers damaged by an outage. All electronics today must restart, without damage, after every outage. Why is AC voltage dropping so low that even electronics shutdown? Fix that defect. Well, yes, security cameras do need a tiny UPS. And since NVRs are so robust, then dirtier power from that UPS is not problematic. Electronics are required to be that robust - even before PCs existed.

UPS protects unsaved data. Saved data in not lost corrupted by any shutdown. That was once a problem if a file was being saved when an outage occurred. The file and its older version might be deleted. By 1990, that one rare problem was eliminated in by filesystem design. Numerous hardware features means hardware works just fine or is completely stopped. One example of those features is a voltage supervisor.

Long before PCs existed, international design standards required brownouts and outages to never damage electronics. One standard was so blunt about this as to include this expression, in all capital letters, across the entire low voltage area. "No Damage Region". If outages or brownouts cause damage, then cited is a parameter from datasheets that define the 'at risk' part. No number will be posted because none exist. If that number did exist, it is listed in the "Absolute Maximum Parameters". Nothing there. Outages and brownouts do not damage electronics. Voltage can drop so low that incandescent bulbs dim to 50% intensity. Even voltages that low are perfectly good for all electronics. If voltage drops lower, then electronics simply power off - no damage (except to unsaved data). If voltages are varying that much, then protection must be installed on less robust appliances - ie refrigerator, central air, garage door opener, furnace, washing machine. Incandescent bulbs can dim to 50% intensity or double intensity. Those are required to be perfectly good voltages for all electronics. If your electronics power off or fail at such voltages, then why did one spend so much money on <deleted>? UPS is temporary and 'dirty' power so that unsaved data can be saved. It does nothing to protect hardware or saved data. Power can be so 'dirty' that UPS manufacturers will (quietly) recommend not powering protector strips or motorized appliances. Since those less robust items might be harmed. But again, that same dirty power is ideal for electronics. Electronics are required to be so more robust. Another urban myth is a protector to somehow 'fix' low voltages. Protectors have a let-through voltage. Maybe 330 volts or above 500 volts. That means it does absolutely nothing until AC voltages well exceed those numbers. How often is your AC mains approaching or exceeding 1000 volts? Then why is protection not on a dishwasher, all clock radios, furnace, RCDs, LED & CFL bulbs, washing machine, stove, and smoke detectors? How many have failed today or this year? Or are they on invisible protectors? Destructive transients are quite rare. Maybe one in seven years. Many do not suffer one in 20 years. But when it exists, it is incoming to everything. Educated consumers earth one 'whole house' protector to protect everything. It comes with numbers that claim protection even from direct lightning strikes. Because is connects low impedance (ie less than 3 meters) to single point earth ground. Effective protection always answers this question. Where do hundreds of thousands of joules harmlessly dissipate? How many joules does that protector claim to protect from? Thousands? How many joules does that UPS claim to protect from? Hundreds? They market to consumers who want to be scammed. Who ignore all numbers. Who fail to learn how protection from all surges (including direct lightning strikes) was done over 100 years ago. Two completely different and unrelated anomalies. Outages and brownouts are completely different from surges. Both are made mostly irrelevant by protection already inside all electronics. Concern is for that rare anomaly that might overwhelm what is already robust (best) protection at electronics (inside electronics) - from brownouts and from surges.