Household and similar electrical appliances - Safety - Part 2-47: Particular requirements for commercial electric boiling pans (IEC 60335-2-47:2002 + A1:2008, modified) (english version)
Protection against pollution of potable water installations and general requirements of devices to prevent pollution by backflow; German version EN 1717:2000; Technical rule of the DVGW— 53 стр.
Equipment for commercial kitchens - Components for ventilation in commercial kitchens - Part 1: General requirements including calculation method; German version EN 16282-1:2017— 36 стр.