Posted by westom on March 31, 2012 at 22:02:59 from (71.185.103.202):
In Reply to: Surge Protector posted by Tom Thumb on March 31, 2012 at 05:11:48:
To understand what a protector does, well, first let's review what a lightning rod does.
Lightning seeks earth ground. So a cloud connected to earth via a church steeple. A wooden steeple struck because wood is an electrical conductor.
But wood is not an ideal conductor. The 20,000 amp lightning current through wood (a poor conductor) creates a high voltage. 20,000 amps times the high voltage means high energy dissipates in the wood. The church is destroyed.
Franklin put a lightning rod on the church. Does a lightning rod do protection? Of course not. The lightning rod is only part of a connection to earth that does not go through wood. That 20,000 amps down a wire to the earth ground rod creates a near zero voltage. 20,000 amps times a near zero voltage is near zero energy. No damage.
Nothing stops or blocks a surge. Any protector that claims to perform that myth is quickly destroyed. Then the naive recommend that useless protector.
The effective protector does what Franklin"s lightning rod did. Connect lightning harmlessly to earth. So that nobody even knew a surge existed.
A lightning rod is part of a system that protects the ‘building’. Lightning striking AC wires down the street is a direct lightning strike to every household appliance. Earth one "whole house" protector as part of a system that protects ‘appliances’. In both cases, protection is provided by what harmlessly absorbs hundreds of thousands of joules.
So what does a protector do? Two completely different devices are both called protectors. One adjacent to an appliance must somehow stop, block, or absorb the surge. Another and well proven device (also called a protector) connects to earth BEFORE lightning enters a building – like Franklin’s lightning rod.
Which solution has been used for over 100 years to have no damage from lightning? The properly earthed "whole house" protector. Facilities that cannot have damage always install the ‘whole house’ type protector. Why does lighting strike munitions dumps and not cause explosions? ‘Whole house’ protectors are that well proven.
Some protectors are so grossly undersized as to fail. So that naive consumers will make assumptions only from observation rather than first learn well proven science. Informed consumers earth only one "whole house" protector so that direct lightning strikes cause no damage - even to the protector.
A direct lightning strike is typically 20,000 amps. So the minimal "whole house" protector starts at 50,000 amps. These are sold even in Lowes and Home Depot for less than $50.
But again, that is only a protector. Also upgrade your earthing to both meet and exceed National Electrical Code requirements. Because earthing (not a protector) does the protection. As Ben Franklin demonstated even back in 1752.
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