Install the Array Equipment-Ground Lugs
All PV arrays need to be properly grounded per the NEC. Pole-mounted PV array equipment-grounding systems have three main components-lugs that attach the ground wire to the PV module frames, the ground wire itself, and a ground rod driven into the earth at the base of the pole. Lay-in lug kits, available from solar energy equipment resellers, are appropriate for long-lasting, corrosion-free connections between the ground wire and the module frame. Lay-in lugs are designed to accept wire from the side, so the hassle of feeding the ground wire through successive lugs is eliminated.
Lugs should be either bronze or stainless steel. They’ll come with stainless mounting bolts or screws, and star washers that will cut through the anodizing on the module frame (ensuring a low-resistance connection). Low-cost aluminum lugs are not suitable, since the fastener will be exposed to weather in this application
and corrosion will result.
Only the module grounding locations identified on the modules themselves should be used. Before you begin fastening the lugs to the module frames, plan the route the ground wire will run between each module, and then down to the combiner box. Use a cordless driver to fasten the lugs to the module frames.
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Come back tomorrow, we’ll talk about installing the Array Equipment-Ground Wiring