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The minimum diameter of a private service main to a hydraulically calculated sprinkler system that...

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The minimum diameter of a private service main to a hydraulically calculated sprinkler system that also supplies a fire

hydrant is

A.

3 in. (75 mm).

B.

4 in. (100 mm).

C.

6 in. (150 mm).

D.

8 in. (200 mm).

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NFPA CWBSP Summary

  • Vendor: NFPA
  • Product: CWBSP
  • Update on: Feb 3, 2026
  • Questions: 100
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TESTED 03 Feb 2026