N.Y. Comp. Codes R. & Regs. Tit. 1 §§ 271-6.11
Except for properly trapped open sinks, there shall be no direct connection between the sewerage system and any drains originating from equipment in which food, portable equipment, or utensils are placed. Inlet pipes (drain pipes) leading from such water sinks shall have a 1/4 inch or larger gap between the inlet pipe (drain pipe) and the receiving pipe or funnel. Where this is impractical, the inlet pipe may extend inside the receiving pipe provided the fit is loose enough to allow free overflow between the two fittings. When a warewashing machine is locate within five feet of a trapped floor drain, the warewasher waste outlet may be connected directly on the inlet side of a properly vented floor drain trap if permitted by law.
N.Y. Comp. Codes R. & Regs. Tit. 1 §§ 271-6.11