"Since it's founding as the National Association of Master Plumbers in 1883, the National Association of Plumbing-Heating-Cooling Contracotrs has maintained a serious interest in plumbing standards, codes and good plumbing design practices.
The Association published the NAMP "Standard Plumbing Code" in 1933 and furnished revised editions until 1942. NAPHC participated in the development of special standards for wartime plumbing and later was represented on the National Plumbing Code Coordinating Committee, whose work ultimately resulted in the adoption of the A40.8 as a standard or model plumbing code in 1955.
NAPHCC served as a sponsor in the early 1960's of the project which attempted to update the 1955 document. This project was operated through the procedures of the American National Standards Institute. However, theA40.8 revision project was not completed because consensus could not be achieved.
In order to provide local and state governments, code adminstrative bodies and industry with a modern, updated code, NAPHCC published the "National Standard Plumbing Code", in 1971, following the format and sequence of the A40.8 to provide for maximum convenience of users.
With the June 1973 revision, the American Society of Plumbing Engineers joined this effort by co-sponsoring the National Standard Plumbing Code. ASPE maintained its co-sponsorship status until September, 1980. Upon ASPE's withdrawal of co-sponsorship, the Code Committee composition was changed to included not only members of the contracting and engineering communities but also members of the inspection community. Contractors, engineers and inspectors now comprise the National Standard Plumbing Code Committee"
