Specifies the performance requirements for hot and cold water pressure systems which use plastics pipes and plastics or metal fittings. Establishes a classification system for common service conditions for pressurized hot and cold water systems. Gives a basis for evaluation and design of thermoplastics pipes and fittings in relation to the system performance requirements. Applies to plastics pipe systems used in association with buildings to carry water under operating pressures of 4 bar, 6 bar or 10 bar for distribution of hot and cold water including potable water, and transportation of hot water for heating.