Final answer:
The incomplete question asks about the prohibited locations for potable water outlets and combination stop and waste valves to ensure a hygienic water supply. Such outlets and valves should not be positioned where they could be submerged in contaminants or subjected to backflow conditions. Compliance with plumbing codes, consulting licensed plumbers, and considering local environmental factors are essential for public health and safety.
Step-by-step explanation:
The question 'Potable water outlets and combination stop and waste valves shall not be located ___' pertains to the rules and regulations concerning the placement of plumbing fixtures to ensure safe and hygienic water supply. The appropriate location is critical to prevent contamination of potable water, which is intended for human consumption. Although the question is incomplete and does not specify where such outlets and valves should not be located, generally, there are specific codes, like the Uniform Plumbing Code or the International Plumbing Code, that provide guidelines on this matter. These codes typically state that potable water outlets and valves should not be located in a manner where they could be submerged in any sort of contaminant or where they are susceptible to backflow conditions that could lead to contamination. This might include locations such as below grade, in pits, or near sources of contamination like sewers or chemical storage areas.
For instance, it would be important to ensure that outdoor hose bibs (spigots) have backflow preventers to avoid the risk of contaminating the potable water system, as well as to avoid waste. In industries and commercial facilities where chemicals are present, special considerations must be taken to prevent cross-connections with the potable water system. Similarly, in areas prone to flooding, it is crucial that potable water outlets and valves are placed above potential flood lines to prevent their submersion.
Compliance with plumbing code requirements is mandatory for ensuring public health and safety, and this includes the location of potable water outlets and combination stop and waste valves. When planning the plumbing for any new construction or during renovations, consulting with a licensed plumber or a building code official is essential to ensure that all regulations are being followed and that the drinkable water supply remains free from potential hazards.