On Tuesday, May 23, 2017 at 1:45:04 PM UTC-4, trader_4 wrote:
There is a lot wrong in that link, starting with that most surges
that one needs to be concerned about originate inside the house.

A popular fable when one does not learn numbers and is educated by advertising. Yes, those are the most - by numbers. And are also called noise. Since all appliances make those and more robust transients irrelevant. Noise does not damage any appliance. But some read noise is more common - so it must be feared.

Only relevant surge can potentially overwhelm protection inside all appliances. It is rare - maybe once every seven years. So informed homeowners properly earth a 'whole house' protector.

Informed homeowners install one 'whole house' protector. And upgrade earthing. That protects all appliances from all types of surges. Including the mythical and feared, potentially destructive surge that originates inside a house.

A direct lightning strike can be 20,000 amps. So an informed consumer properly earths a 'whole house' protector that is, at minimum, 50,000 amps. These are provided by other companies of integrity. Then upgrade earthing - the single point earth ground. That is where hundreds of thousands of joules harmlessly dissipate.

How many joules does that near zero joule plug-in protector claim to absorb? Hundreds? A thousand? Those tens of times more expensive plug-in protectors are recommended by many who always ignored numbers. And then post demeaning replies here to avoid admitting they "ignore spec numbers".

A protector is only as effective as its earth ground. As was well understood over 100 years ago. Informed homeowners spend tens or 100 times less money on something that actually means protection from all surges - including direct lightning strikes - and a mythical interior generated surge.