Any actual or potential connection between a drinking (potable) water system and an unapproved water supply or other source of contamination For example, if you have a pump moving nonpotable water and hook into the ground water system to supply water for the pump seal, a cross-connection or mixing between the two water systems can occur This mixing may lead to contamination of the drinking water Also see backsiphonage and backflow
Any physical connection or arrangement between two otherwise separate piping systems, one of which contains potable water and the other, water of unknown or questionable safety, or steam, gas or chemical whereby there may he a flow from one system to the other, the direction of flow depending on the pressure differential between the two systems (2)
Cross Connection (CC) is the wire connections running between terminals on the two sides of a distribution frame, or between binding posts in a terminal