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1311.1.1 Cover Requirements
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Underground piping
systems shall be installed with a cover not less than 12
inches (305 mm), Where external damage to the pipe or
tubing from external forces is likely to result, the cover shall
be not less than 18 inches (457 mm). Where a cover not
less than 12 inches (305 mm) cannot be provided, the pipe
shall be installed in conduit or bridged (shielded). [NFPA
54:7.1.2.1]
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