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TV rec's
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westom
Posted 10/1/2016 20:50 (#5558960 - in reply to #5558826)
Subject: RE: TV rec's


Glenn Dye - 10/1/2016 19:42
So what's the best way to prevent it from happening again?

Best protection means a surge is not be incoming to anything. An incoming and outgoing path must be at the service entrance. So that a best connection to earth is a low impedance (ie less than 10 foot) connection to earth. Then a current is not inside hunting for earth destructively via appliances.

TV cable has that protection installed for free. A hardwire connects cable's ground block to the single point earthing electrode. Then a current path from cloud to distant earthborne charges need not be inside.

Telephone also is required to install that protection for free. But phone wires cannot connect directly. So a protector does what a hardwire does better. Makes a low impedance (ie no sharp wire bends) connection to earth.

AC electric is not required to have service entrance protection. A surge incoming on AC mains finds appliances, connected to phone or cable, as a best outgoing connection to earth. Damage is typically on that outgoing path.

Best protection is missing if a homeowner does not earth all incoming AC wires at the service entrance. A 'whole house' protector from companies of integrity makes that low impedance, earth ground connection.

Appreciate that no protector does protection. Protector is only a connecting device. Protection is an item that harmlessly absorbs hundreds of thousands of joules. How to increase protection? Upgrade / expand single point earth ground.

Lightning is typically 20,00 amps. A protector must never fail on any surge. So a minimal 'whole house' protector is 50,000 amps.

50,000 amps defines protector life expectancy over many surges - many decades. Single point earth ground and its low impedance connection defined protection during each surge.

A plug-in protector is only rated to absorb near zero joules. And does not have a low impedance connection to earth. It only claims to protect from anomalies that typically do not do damage.

Protection is always about where hundreds of thousands of joules harmlessly dissipate. That means spending maybe $1 per protected appliance for a 'whole house' protector. A protector is only as effective as its earth ground. That protector and earthing electrode was best protection even 100 years ago.



Edited by westom 10/1/2016 20:56
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