A journeyman plumber connecting roof drainage receptors is working on the building's what system?

The connection of roof drainage receptors pertains specifically to the storm drainage system. This system is responsible for managing rainwater or melted snow that collects on roofs and other surfaces, channeling it away from the building to prevent flooding and water damage.

In this context, the role of the journeyman plumber involves ensuring that the drainage from the roof is properly directed into this system, which may include gutters, downspouts, and underground drainage solutions. The storm drainage system is designed to handle precipitation rather than wastewater from fixtures, which distinguishes it from other systems like sanitary drainage or domestic water.

Understanding this distinction is crucial for plumbing professionals, as each system has different components, purposes, and regulations that must be adhered to in order to effectively manage water flow and maintain building integrity.