Mark, Yes, it's confusing. Which is why I wanted to know what the Wrenches are actually DOING in their installations to meet 690.47D.
On 6/5/09 1:19 PM, "Mark Frye" <[email protected]> wrote: > Thanks Kelly, > > I haven't gotten the handbook, but I think I am getting the picture. > > How nice of the handbook to let us know that the new GE and GEC that "shall > be installed" according to 690.47D is nothing more than an "optional > supplementary ground electrode". And furher, if you do choose to take the > option of installing it, in order to have the best lightning protection, you > don't have to bond it to the exisiting GE system. How easy to now disregard > 250.106 which says that 'The lightning protection system ground terminals > shall be bonded to the building or structure grounding electrode system". > > Considering the inherant problems of 690.47D, I can certainly understand any > AJH trying to avoid this issue of the creation of a whole new class of GE's > who's use falls completely outside the basic definitions of 250 III 250.50, > "All grounding electrodes.....shall be bonded together to form the grounding > electrode system." Remember, any other sections of the NEC are superceded by 690, if there are conflicts (690.3) Best, -Kelly Kelly Keilwitz, P.E. Whidbey Sun & Wind, LLC Renewable Energy Systems NABCEP Certified PV Installer 987 Wanamaker Rd, Coupeville, WA 98239 PH & FAX 360-678-7131 [email protected] _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] 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
