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M-807.3 Protection against corrosion: Gas piping in contact with material that will corrode the piping shall be protected [in an approved manner] by a wrapping or coating of extruded plastics, plastic applied as a dry resin, hot-applied bituminous asphalt or coal tar, approved plastic tapes, approved bituminous tapes, or shall be protected by other approved protection methods. Where dissimilar metals are joined underground, dielectric fittings or couplings shall be installed.

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M-807.7 Tracer for plastic piping: An insulated copper tracer wire or other approved conductor shall be installed adjacent to underground nonmetallic gas piping. Access shall be provided to the tracer wire or the tracer wire shall terminate above ground at each end of the nonmetallic gas piping at a building wall or riser. The tracer wire size shall not be less than [18] 14 AWG and the insulation type shall be suitable for direct burial.

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M-809.7 Cutting or notching: A structural member shall not be cut, notched or pierced [in excess of the limitations specified in the building code listed in Chapter 21, unless proven safe by a structural analysis] except as provided for in the building code.

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