<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Most solar array string wiring is in the #10 range and NEC Table 250.122 allows a #10 to #12 bare copper ground wire connected to the back of each module grounding lug based on staying under 100 amps max. breaker rating in the combiner boxes. However, 250.120( C) states “<i>equipment grounding conductors smaller thatn #6 shall be protected from physical damage and run in raceway………………except where protected from physical damage</i>” <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For modules mounted on ground mounted racking and racking located on roofs and structures where you can access the back of the modules we had to use #6 base copper.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I just commissioned a large array on multiple raised racking, but installed on a raised steel structure allowing parking under the array. Although you would need a ladder to access, this ground wiring is exposed and visible from below. The inspector has not been involved “YET” , but I want to make sure I do not allow this and the inspector later flags it.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any of you run into this before?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Jeff Yago<o:p></o:p></p></div></body></html>