Posted by westom on August 29, 2012 at 07:01:48 from (72.94.245.184):
In Reply to: Re: Strike protector? posted by George Marsh on August 28, 2012 at 13:19:07:
Understand that the protector never does protection. A protector connected low impedance (ie 'less than 10 feet') to earth means earth absorbs surge energy. If that protector does not have a short earthing connection. then a protector is described as 'useless'.
Every wire inside every incoming cable must connect that short to earth. If not, then all protection is compromised. Does the TV cable also makes a low impedance (ie 'less than 10 foot') connection to the same earth ground? If not, protection is compromised.
A protector protects household appliances. It works only because it is earthed. A lightning rod protects the building. It works only because it is earthed. Lightning strikes interior wires because a building also has been damaged - no lightning rod. In every case, lightning finds the best path to earth. Harmlessly outside (via a 'whole house' protector or lightning rod). Or destructively inside (via appliances or walls).
Protection is always about how that current gets to earth. Protection is always about the only item that harmlessly absorbs that energy - earth. Critically important is the single point earth ground.
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