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:i'UNIRAC Unirac Code-CompliantInstallationMantial SolarMount <br />[3.3.1] Planning the installation area <br />Distance between <br />, lag boil centers <br />Decide on an arrangementfor clips, rails, and L-feet (Fig. 22). <br />Use Arrangement A ifthe filll.width of the railscontacts the <br />module. Otherwise use Arrangement B. <br />Caution. lf·you choose Arrangement B, either <br />cl) use the upper mounting holes ofthe L-feet or <br />(2) be certain that the L feet and clip positions don't <br />conflict. <br />-2*212 --·-2/4,6/.%- <br />-- Distance between - <br />module mounting holes <br />PV module <br />fModule boll Clip 2 <br />i El <br />lf rails must be parallel co the rafters, it is unlikely that they <br />can be spaced to match rafters. In that case, add structural <br />supports - either sleepers over the roo f or mounting blocks <br />beneath it. These additional members niustmeet code; if in <br />doubt, consult a professional engineer. <br />Never secure the footings to the roofdecking alone. Such an <br />arrangement will not meet code and leaves the installation <br />and the roof itself vulnerable to severe damage from wind. <br />M-•-Lag boll <br />A-98" + <br />L-foof-Un_ <br />X <br />Distance between <br />- lag bolt centers- <br />- -lh-Na <br />- Distance between - <br />module mounting holes <br />Leave enough room to safelymove around the array duringinstallation. The width of a rail-module assembly equals the ' <br />length of one module. Note that L-feet may extend beyond <br />the width of the assemblyby as much as 2 inches on each <br />side. The length of the assembly equals the total width of the <br />modules.f <br />e <br />Figure 22. ClipArrangementsA and B <br />Pa'e <br />22 <br />.