Recent content by westom

MCB only monitors current. If current is excessive, then it disconnects. Its only purpose is to protect human life. You are asking about protecting appliances. MCB should not and does not. Names such as Belkin only have credibility due to myths and lies in advertising. Others who actually...

Anything that says 'what to do' and does not include the so many reasons why is useless information. Those who want to be told 'how to think' or 'what to do' are people who also blindly vote for extremist leaders and are easily scammed. Posts that include 'reasons why' target the better...

If it does something useful, then we are viewing relevant specification numbers that say so. Human safety says it better have a circuit breaker or fuse so as to not overload the connected wall receptacle.

Earth ground is (probably) totally unrelated to what causes HDMI damage. Implied is existence of a floating ground. 6Pack described how he corrected that problem related to a completely different ground - safety ground (ie in a wall receptacle). In another case, AOC and Asus replaced a...

Read what was posted. ADSL or cable modem makes no difference - other than 'installed for free' protection on cable is even better. A surge does not enter on a cable modem IF it is installed per electrical codes that have existed long before you or I existed. Since the protection on cable...

How does a surge enter on a cable that already has best protection? It doesn't. An electrical current entered on an ADSL line, damaged a router, and then stopped? Nonsense. We all learned in elementary school science that electricity never works that way. If a surge is incoming on ADSL...

What is missing? What is the threat? Potentially destructive surges are hundreds of thousands of joules. What does that Belkin or APC claim to 'absorb'? Hundreds? A thousand joules? That is near zero protection. Always read specification numbers. Always ignore any recommendation that is...

One pays tens of times more money for plug-in protectors that even say (in specifications) that it does not protect from potentially destructive surges. A POV not tempered by well proven science and without numbers is classic junk science reasoning. Honest responses are always tempered by...

Subjective denials of something that was never said. Inaccurate as indicated by no reasons why, no facts, subjective claims, and no specification numbers. No numbers is a first reason to best ignore some posts. Surge protectors that fried were ineffective protection. Sufficiently sized (and...

Is it? Every word is subjective. Some UPS manufacturers promote their product as a pure sine wave (such as one I am looking at). But it is also a square wave output. Stepped and square waves are nothing more than a sum of pure sine waves. They did not lie. They were simply subjective...

First, like expectancy of a UPS is typically three years. Second, most electronic damage exists without any visual indication (ie inside a PSU). Third, protectors too close to electronics and too far from single point earth ground can compromise more robust protection routinely found in...

A concept taught to first semester engineers is superposition. To a surge current, that that battery is a short circuit. Therefore a UPS battery gives a surge (ie on hot wire) more paths into an attached appliance on all three wires (hot, neutral, and safety ground). If a surge current is...

Protection by a sacrificial device is a classic urban myth. It requires forgetting how electricity works. If electricity is incoming to that UPS, then electricity is also outgoing into attached appliances - simultaneously. At the same time, that current is outgoing from that appliance to...

redundant post

Potentially destructive surge might occur once every seven years. So what did a UPS do? It failed to provide any hardware protection on what was probably the only surge it saw. If a protector does not have that always required and dedicated wire to earth ground, then it does not even claim to...