post #11 of 11
Originally Posted by Nakattk;12966910 
Does having my cable line go through a surge protector help to avoid lightning damage?
The NIST (US government research agency) answers that:
A very important point to keep in mind is that your surge protector will work by diverting the surges to ground. The best surge protection in the world can be useless if grounding is not done properly.
If that protector does not make a low impedance (ie 'less than 10 foot') connection to earth, then the NIST defines it as "useless". I only call it ineffective.

From our analysis of surge damage, a protector too close to electronics and too far from earth ground sometimes makes electronics damage easier.

Or read that protector's spec numbers. Somehow its hundreds of joules will make a surge's hundreds of thousands of joules magically disappear? Or that 2 cm part inside will stop what three miles of sky could not? Obviously not. So a $3 power strip with ten cent protector parts sells for $25 or $150. It is a profit center; not surge protection.

A protector on cable may also degrade cable signals. Another reason why cable companies recommend no protector on their cable.

Almost none of this is known to an overwhelming majority. Advertising (subjecitve reasoning) rather than science is the source of most protector recommendations. Advertising is that effective because a majority never demand the always required numbers. Those numbers are damning.

The bottom line is this: a protector is only as effective as its earth ground.