NFPA 13, 2013 edition
6.3.1.1.1* Underground pipe shall be permitted to extend into the building through the slab or wall not more than 24 inches.
A.6.3.1.1.1 Extending the underground into a building provides working room to transition to the appropriate above ground piping. Environmental conditions should be considered as outlined in 23.1.6.1.2
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