The Electrical BOS step of System Design has been completed.
Permit-ready design Site information required:
What will be done during these steps?
We'll be working strictly in the properties panel on the right. Starting from the top we'll specify:
Choice of rail
Choice of mount
Roof Wind Zone Max Rail Spans
Our Attachment Layout.
Roof Wind Zone Attachment Spacing
Number of Fasteners for Each Mount
Embedment Depth of Fasteners
Whether our racking system is UL 2703 compliant
Specify rail and mount
Using the drop down menus select the rail and mount.
Input span values for each wind zone
Next specify the Max Rail Span for each wind zone. These are different from the max attachment spacing, which will be specified later.
Why are these numbers important?
Correct values for these fields are critical. Everything from accurate maximum cantilever values (and thus accurate attachment layouts) to accurate calculations of racking hardware weights and quantities of racking hardware components on the bill of materials are affected by these numbers. If you use erroneous values to rush through the design process, some parts of your permit package (such as the attachment layout and racking hardware quantities and weights) may be inaccurate or missing.
How do I find the maximum rail spans for my design?
To find the correct maximum rail span values for designs use the rail manufacturer's online configuration tool for the rail product you're using.
This is specified with the next drop down menu. Attachment Layout is where mounts will be placed under the rail. By default the attachment spacing is staggered but you can change it to aligned columns and aligned columns (strict).
Max Attachment Spacing
We'll specify our Max Attachment Spacing for each wind zone with the next 3 dropdown menus.
The last two fields of the mounting BOS are the number of fasteners needed for each mount and their embedment depth.
What if I don't see the rail option I'm looking for?
Here is where you can find out more about adding new racking products that are not currently available.
Congratulations, you've completed your design and you can now download a complete permit package! This article will walk you through the permit package generation step.