What characterizes an indirect waste pipe?

An indirect waste pipe is specifically designed to discharge waste indirectly rather than through a direct connection to the drainage system. This characteristic is crucial for preventing contamination and protecting the potable water supply. The indirect waste pipe discharges waste through an air break or gap into a trap, fixture, receptor, or interceptor, which allows for separation and safe handling of the waste before it enters the drainage system. This design is essential for maintaining sanitary conditions and preventing cross-contamination between the waste and clean water supplies.

The other options do not accurately describe an indirect waste pipe. For instance, being directly connected to the drainage system does not apply, as that would define a direct waste pipe. A pipe used for pure water, not waste, misrepresents the function of an indirect waste pipe, which is specifically for waste materials. Lastly, the notion that an indirect waste pipe is only found in industrial settings is incorrect, as these pipes are commonly used in various residential and commercial applications, particularly wherever there's a need for safe waste discharge without direct connection risks.