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In the past the FDC was optional. NFPA 13: Standard for the Installation of Sprinkler Systems now requires the connection except for systems of 20 sprinkler heads or less, or when permission has been obtained from the authority having jurisdiction.

Sources- Brannigan & Corbett- Building Construction for the Fire Service (4th Ed) 2008. The above is a direct quote on page 288 if you so need it for a paper.

So when you have more than 20 sprinkler heads, or when you have obtained permission.

Doug E.

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Q: How many fire sprinkler heads are needed for a fire department connection to be installed?
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