DC Fire Sprinkler Practice Questions - District Of Columbia Fire Sprinkler Contractor Exam

Under NFPA 13 as adopted in DC, what is the difference between a cross main and a branch line?

There is no difference A cross main supplies water to branch lines, which directly feed individual sprinklers Branch lines are larger than cross mains Cross mains run vertically while branch lines run horizontally

Correct Answer:

A cross main supplies water to branch lines, which directly feed individual sprinklers

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