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Figure 7B: Installation of the grounding lug
In this grounding method the s e r r a t e d ' star' washers are required for making a reliable
g r o u n d connection t h r o u g h t h e a n o d i z e d c o a t i n g a n d into the aluminum frame as
well as to prevent loosening of the screw over time.
An alternative method of attaching the grounding lugs may require the use o f #8-32 (4mm)
bolts, nut, star washers and lock washers. The ground lug shall be installed from the
bottom side of the frame using the paint cutting star washers, lock washer and bolt.
Torque t h e hex bolt (if used) to 50-70 in-lbs. This ground hardware can accommodate a
14AWG through 4AWG bare (stranded or solid) wire.
Copyright Bosch Solar Energy Corp., version 1.0
Page 15 of 19
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