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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Presumed RF Interference
On Mon, Mar 06, 2006 at 09:49:39AM -0500, Steven M. Bellovin wrote: > > On Mon, 06 Mar 2006 21:17:17 +1100 > Matthew Sullivan <[email protected]> wrote: > > > (In the > > UK where I served my apprenticeship, we were required to provide earth > > bonding to the copper plumbing system, additional bonding at every > > exposed fitting - this caused a few issues when plumbers first starting > > using PVC pipes)... > > The US National Electrical Code (which has no national force of law; > it's a model code voluntarily adopted by many jurisdictions) now bars > grounding to pipes except within (as I recall) six feet of where the > pipe enters the building, for precisely that reason. The use in modern times of teflon tape at joints in copper piping makes them unuseable for earth grounds even near the entry point to the building. A long (e.g. 2-3 meters) copper stake must be driven for a proper earth ground, or else a large copper mesh mat if the ground is rocky -- unless you are certain that the copper piping that you want to use extends a significant distance underground and unbroken. -w
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