I have heard from hams that running your feed line through metallic conduit will choke out lightning.
Sent from my iPhone > On May 30, 2019, at 6:47 AM, Lewis Bergman <[email protected]> wrote: > > Chuck is better on the theory, I have only been to a few R56 classes so I > could be incorrectly remebering. The theory, again not my thing, is rooted in > inductance and choke which increases resistence along the length of the cable > traveling through the conduit. The faster the spike (strike) the greater the > resistance. It can cause a conductor to blow apart. it applies to a conductor > carrying a large surge. It has to do with the magnetic properties of all > ferrous metals. According to the NEC, which the R56b standard pulls from in > part is below and says you have to ground each end. I don't know if this is > the exact language in the current NEC as I don't own a copy. > > NEC Section 250.64(E) includes requirements to address such protection. If a > grounding electrode conductor is installed in a ferrous metal raceway, the > raceway must be electrically continuous from the point of attachment to the > cabinet or equipment to the grounding electrode and must be securely fastened > to the ground clamp or fitting. Ferrous metal raceways contain iron or steel > content, and examples include rigid metal conduit (RMC), intermediate metal > conduit (IMC) and electrical metallic tubing (EMT). These conduits and tubing > have a magnetic property that reacts to rising and falling magnetic fields > present in alternating current (AC) systems. > Here are some examples: > https://www.carelient.com/2018/12/21/grounding-electrode-conductor-nec-violation-example/ > > https://www.ecmag.com/section/codes-standards/guardian-ground > > I think I have previosuly posted a link to my dropbox with the R56. I am > positive it is out of date but following it is better than not following > anything. It has a lot of good illustrations and pictured to help clarify > things as well. > Here it is again: R56 manual > > The long and short of it is that is a lot easier to use PVC than ground each > end of the metal conduit. > >> On Wed, May 29, 2019 at 10:10 PM Jaime Solorza <[email protected]> >> wrote: >> Hum..the number 6 ground cable is insulated...direct bonding to 10 ft. >> ground rod. >> Please explain your observation...I have had great success with this method >> but open to improvements or corrections >> Thanks >> >>> On Wed, May 29, 2019, 9:02 PM Lewis Bergman <[email protected]> wrote: >>> That conduit might serve as a choke on that ground. >>> >>>> On Wed, May 29, 2019, 9:56 PM Jaime Solorza <[email protected]> >>>> wrote: >>>> Site pro mount, PC-Tel antenna, Heliax cable and accessories. .inside >>>> GE-MDS radio. 928.xxx and 952.xxx MHz. >>>> -- >>>> AF mailing list >>>> [email protected] >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> -- >>> AF mailing list >>> [email protected] >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > Lewis Bergman > 325-439-0533 Cell > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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