BACKFLOW PREVENTION. 5-402.11

A. Except as specified in items B, C, and D, a direct connection must not exist between the sewage system and a drain originating from equipment in which food, portable equipment, or utensils are placed. P1 B. Item A does not apply to floor drains that originate in refrigerated spaces that are constructed as an integral part of the building. C. If allowed by chapter 4714, a warewashing machine may have a direct connection between its waste outlet and a floor drain when the machine is located within 5 feet (1.5 meters) of a trapped floor drain and the machine outlet is connected to the inlet side of a properly vented floor drain trap. D. If allowed by chapter 4714, a warewashing or culinary sink may have a direct connection.