Some UPSes have tiny (near zero) protector parts so that naïve consumers will recommend it as a protector. Destructive surges are hundreds of thousands of joules. An adjacent protector can only block or absorb that surge. How does its (near zero) hundreds of joules absorb a surge that is hundreds of thousands of joules? It doesn't. But at hundreds of joules, it can hype 100% surge protection in color glossy brochures for consumers who ignore numbers.

Surges must be earthed (shunted) before entering the building. A surge shunted at the appliance simply shunts that surge into the appliance. A completely different device, also called a surge protector, does protection from surges because it is at the service entrance.

A typical UPS provides temporary and 'dirty' power during blackouts. It also does nothing to 'clean' AC power. Therefore it costs much less money - compared to another device also called a UPS that is located at the service entrance.


Has this growing season started late due to cold?