NM CID MM-1 Practice Questions - New Mexico CID MM-1 Plumbing Examination Exam

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An isometric shows six public 1.6 gpf water closets on one 3 inch horizontal branch, total 24 DFU. The branch is sloped 1/4 inch per foot and is not circuit-vented. What is the sizing defect?

24 DFU exceeds the 3 inch horizontal 35 DFU limit Public water closets are only 3 DFU, so the branch is oversized No defect; six closets are allowed on 3 inch if DFU stays under 35 A 3 inch drain may not serve more than five water closets, so the branch must be increased to 4 inches

Correct Answer:

A 3 inch drain may not serve more than five water closets, so the branch must be increased to 4 inches

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