• Concurrent Cause Control Clause (ACC) is a term in a first party policy that indicates that losses caused by a combination of covered and excluded causes of loss will not be covered. The ACC provision, as it is commonly called, applies either to situations of successive causes, where the first event sets in motion a chain of events that cause a second event to cause a loss, or to situations of simultaneous causes, where two or more causes of loss occur simultaneously and result in the same injury or damage. If any cause of loss falls under a policy exception that is accompanied by ACC, the loss will be excluded, regardless of whether the other non-excluded cause of loss qualifies as an “immediate cause” under the jurisdiction’s common law rules.