Actually my read of 2008 code should allow the pole to qualify as the grounding electrode: 690.47 (D) allows the mounting structure to be the electrode if it meets 250.52. 250.52(A.7) plate electrode says you need at least 2 sq. ft of 1/4" steel plate. A 6" diam pipe 4 ft in the ground, will have 6.8 sq. ft of surface area...... A 4" diam pole will have 4.7 sq ft of surface area..... Anybody see a flaw in this logic?
R. Walters r...@solarray.com Solar Engineer On Mar 13, 2010, at 1:06 PM, Bob-O Schultze wrote: > Agreed. I'm surprised that no one mentioned that nice 3'-5' deep hole is a > hell of a nice start for your grounding electrode.... > > On Mar 13, 2010, at 8:30 AM, Kent Osterberg wrote: > > The need for rebar or not depends on how the pole is secured and on the shape > of the footing. If you are installing a pipe in a deep narrow hole per most > mount manufacturer's specifications, no rebar should be necessary. Anything > else will certainly require rebar and per manufacturers' disclaimers should > be designed by an engineer. For example, if the installation will have > j-bolts in the concrete with the post welded to a plate held in place by the > j-bolts, a full rebar cage will needed. > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
