What safety requirement ensures that pool drains do not create dangerous suction effects?

The safety requirement that ensures pool drains do not create dangerous suction effects is associated with maintaining proper drainage systems in swimming pools. Specifically, the correct answer highlights the importance of a properly located cleanout, which facilitates access for maintenance and ensures that debris does not accumulate in the drainage system. This is crucial because blockages can lead to increased suction pressure that may create hazardous situations for swimmers. When drains are clear and accessible through cleanouts, it minimizes the risk of dangerous suction effects that can occur if drains are improperly positioned or maintained.

While regular inspections are important for overall pool maintenance, they do not directly prevent suction hazards unless they lead to the identification and rectification of drain placement issues. An air gap and the use of solid copper are not relevant factors in addressing suction hazards specifically related to pool drains. The cleanout serves as a proactive measure, ensuring that drainage systems are functioning correctly and safely, thereby preventing potential accidents associated with drain suction.