417.1 Medium pressure gas. The installation of a medium pressure gas system (2 psig or 5 psig) within a building must be pre-approved by the local gas utility. Steel piping shall be welded or assembled with press-connect fittings. Test pressure for all medium pressure gas piping shall be 60 psig.
Exception: Medium pressure gas piping within mechanical rooms housing the equipment being served, shall be threaded, welded, or assembled with press-connect fittings in accordance with IFGC 403.10. Threaded piping and piping assembled with press-connect fittings shall not be concealed within construction.
417.2 CSST medium pressure gas. The installation of a CSST medium pressure gas system (2 psig or 5 psig) within a building must be pre-approved by the local gas utility. Test pressure for all medium pressure gas piping shall be 60 psig. Joints shall be limited to the meter connection and at the regulator to the appliance being served. Intermediate joints are not allowed without prior approval.