Doug McGarrett wrote:
James Knott wrote:
Quite so. Those power bar suppressors, at best, will remove large noise spikes from the power line, assuming they've got a good, solid ground connection. The U-ground is not sufficient. Everything coming into your house (power, cable TV, phone etc.) is supposed to be connected to a good ground (usually water pipe) at a common point. The purpose of having one and only one ground point is to prevent loops that will often make the problem worse.
The author is wrong. The National Electrical Code specifies that the power ground shall be an 8 foot ground rod, driven at the point of entry to the house. The telephone company, at least in this area, drives its own ground. I don't know that the cable company does anything about grounding, and that's likely to be why I have a blown TV and ethernet connections. I don't know about where you live, but around here (Canada) the water supply line from the street is commonly used for grounding. Cable TV & telephone lines are supposed to have properly grounded surge suppressors too.
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