bALLAST - dESIGN dELIVERABLES

Electrical design for ballasts will follow a format identical to the normal residential electrical design process except for one thing:

• Homerun Conduit will always be Exterior

Even though we will import the racking equipment quantities directly from the Unirac report, we still need to fill out the racking calculator:

• This ensures that trunk cables will be  called out for stringing modules.

The structural loads will be filled out as a normal Vaulted Conventional Framing would be.  You should have already vetted the max span prior to this step.

• On ballast systems, roof pitch can default to 0.

For Tar & Gravel roofs, Unirac Racking will register automatically. You will need to manually change this from the Simple Grip Default on the following roof types:

• TPO/EPDM

• Modified Bitumen/Rolled Comp

To do this, first navigate to CSettings. You may need to unhide this tab to get to it.

Scroll to "Standard Standoff for Roof Type:

• copy the "Unirac RM10" From one of the roofs that defaults to that option.

Past this value to be the default for TPO/Rolled Comp in "Standard Standoff for Roof Type"

Also paste this value into the appropriate "Standard Racking for Roof Type" field.

• To account for extra junction boxes that may be needed for the exterior conduit home-run, add an extra Junction Box and an Extra Grounding lug.

• Next, we need to add rows for our racking equipment and the MLPE clip. 

  • You will need to insert 5 rows.

This will be the "Average PSF" from the Unirac Engineering report. You can just use the large bolded blue number at the top in this field, however, understanding how this field was calculated will help you understand the next set of calculations we will need to do:

1. Take the "Total Weight on Roof" value (2119 in this example) 

2. Divide it by the Total Module Area (~260 in this example)

   • Note the Total Module Area value will appear as though it were a negative value "-260" but the "-" is actually a "~" meaning "approximately"

This is what it will look like written out: 2119 / 260 = x

A similar calculation is used here:

1. Take the "Module Weight" value (376 in this example) 

2. Divide it by the Total Module Area (~260 in this example)

   • Note the Total Module Area value will appear as though it were a negative value "-260" but the "-" is actually a "~" meaning "approximately"

This is what it will look like written out: 376 / 260 = x

Again, a similar calculation is used here:

1. Take the "Racking Weight" value (47 in this example)

2. Add the "Ballast Weight" value (1696 in this example) to this number before dividing by the "Total Module Area."

3. Divide it by the Total Module Area (~260 in this example)

   • Note the Total Module Area value will appear as though it were a negative value "-260" but the "-" is actually a "~" meaning "approximately"

This is what it will look like written out: (47 + 1696) / 260 = x

For this page, we will include the Engineering Report that goes over the Engineering specs for the entire system and the Detailed Parts Description:

• Use the snipping tool and past into AutoCAD.

• The red outline represents the total area that you will need to snip.

For this page, we will be condensing 3 pages of the Design Criteria Pages from the Unirac Report to fit on this page. We need the Wind Design, Seismic Design, and Snow Design.

• Use the snipping tool and past into AutoCAD.

• The red outline represents the total area that you will need to snip.

• Note, these are all on separate pages of the Unirac report.

For this page, we will be pasting the Engineering report for each array per roof section. Make sure to organize in such a way that the arrays line up with their reports:

• Use the snipping tool and past into AutoCAD.

• The red outline represents the total area that you will need to snip.

• Note, these are all on separate pages of the Unirac report.

Remember, we need to grab the reports for each array.