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Cable surge protection

NonComposMentis
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Last Modified: 2013-11-14
Hello experts.  I have a question about how much protection is provided for the internet cable against lightning strikes by relatively high end consumer grade surge protectors.  My habit is to unplug the surge protector in a lightning storm for maximum protection, but unscrewing the coax is rather tedious and I usually don't bother with it.  I am assuming that lightening is the only kind of surge one would have to worry about from the cable, but if I'm wrong please let me know.
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Thomas GrassiSystems Administrator

Commented:
Check to make sure your cable service is properly grounded at the entry point to your home.

I installed Direct TV Satellite service years ago and we had to install a ground rod or run a ground cable to a known good ground on the home or apartment.

If grounded properly then unplugging the cable is not required.

The surge protection should be that a surge protector many get a power strip confused with a surge protector .

If you have a surge protector then you system is protected.

If you leave your home for a long period of time like for vacation then unplugging everything is not a bad practice.

Author

Commented:
I should have been more clear that power strip has ports to enable the cable to be routed *through* it.  It is clear that it is at least *pretending* to be a surge protector.  As I recall when I bought it, it was rated for a certain number of joules, although I couldn't say now what that number was, and anyway I assume that would be for the power line rather than the cable.
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Commented:
>> ...anyway I assume that would be for the power line rather than the cable.

More or less. It will protect the cable line from ...hmmmm... stray surges that find their way on to it.
But a close/direct lighting strike, will blow right through/pass any normal protector (think spark plug gap).
But as trgrassijr55 already mentioned, having your outside box properly grounded (and crossing your fingers), is about all you can do.

They do have Lighting Arresters, that tie into your Main Power Box. But I'm not sure if/how you could/would go about rigging one of those to the cable.
Just a thought...

Author

Commented:
So what I'm hearing from coral47's carefully calibrated snark is that the cable 'in' and 'out' ports on a consumer grade surge protector is mostly a marketing gimmick.  Am I close?
Thomas GrassiSystems Administrator
Commented:
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Commented:
Thank you much.   : )

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