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1221.2 Embedded Piping and Joints
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Piping for heating or cooling panels embedded in concrete shall be steel pipe, Type L copper tubing or plastic pipe or tubing rated at not less than 100 psi at 180°F (689 kPa at 82°C). Joints of pipe or tubing that are embedded in a portion of the building, such as concrete or plaster shall be installed in accordance with the requirements of Section 1221.2.1 through Section 1221.2.3.
Steel pipe shall be welded by electrical are or oxygen/acetylene method.
Copper tubing shall be joined by brazing with filler metals having a melting point not less than 1000°F (538°C).
Plastic pipe and tubing shall be installed in continuous lengths or shall be joined by heat fusion method.