SC Plumber Contractor Practice Questions - South Carolina Plumber Contractor Examination Exam

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Cast-iron soil pipe installed underground as a building drain must be supported on a firm bed. Which additional installation rule applies?

Hubless couplings are prohibited underground. The pipe shall be supported throughout its entire length, and the trench bottom shall be uniform. Only 10-foot lengths may be used underground. Cast iron is limited to above-ground use in the 2021 IPC.

Correct Answer:

The pipe shall be supported throughout its entire length, and the trench bottom shall be uniform.

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