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11.12.3.2.5.1
For one- and two-family dwellings with an automatic sprinkler system installed within the dwelling in accordance with 13.3.2.19, for PV arrays occupying up to 66 percent of the plan view roof area, a minimum 18 in. (457 mm) setback shall be provided on either side of a horizontal ridge.
11.12.3.2.5.2
For PV arrays occupying more than 66 percent of the plan view roof area on sprinklered one- and two-family dwellings, a minimum 36 in. (914 mm) setback shall be provided on either side of a horizontal ridge.

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