EN 203-1-2014 pdf download.Gas heated catering equipment-Part 1 : General safety rules.
5.1.2 Materials and methods of construction
The quality and thickness of the materials used in the construction of the appliance shall be such that the constructional and operational characteristics are not altered during normal operation (particularly for parts in contact with combustion products). All parts of the appliance, when installed in accordance with the instructions and accepted practice, shall withstand the mechanical, chemical and thermal actions to which they may be exposed during operation, and in particular:
— condensation produced at start-up and/or during operation of the appliance shall not affect the safety;
— any corrosion shall not give rise to a disturbance which might affect safety.
All pressurized parts of the appliance shall be designed and constructed so that they withstand the mechanical and thermal conditions to which they are subjected, without this affecting safety.
Materials containing asbestos shall not be used in the construction of the appliance.
Zinc alloys may only be used in contact with gas if they are of quality ZnAl4 as defined in Iso 301 and if the parts are not likely to be exposed to a temperature greater than 80 °C, under the conditions of 7.4.2. For the main valve intet and outlet connections, only external threads as specified in EN ISO 228-1 are permitted if they are made from zinc alloy.
The nature and surface conditions of materials likely to come into contact with food shall be such that they
cannot contaminate or spoil the food.
Sharp borders and edges, which could give rise to Injury, shall be avoided.
If the appliance is fitted with wheels or castors, two of them at least shall be lockable and accessible.
5.1.3 Use, cleaning and maintenance
Parts which are required to be removed during maintenance shall be designed or marked so that they can be re-assembled easily, and in complete safety. in the correct position and without the risk of mistake.
The user shall have completely safe access to every control knob, button, etc., necessary for the use of the appliance, after opening a door if necessary, but without having to remove any part of the case.
The user shall be able to clean the appliance easily. In particular, it shall be possible to carry out, without the use of a tool, all the operations described in the instructions for use and maintenance.
Unless they are fitted with an electrical interlock which cuts off the supply to motorized parts. it shall not be
possible to loosen the protective covers of movable parts without the aid of a tool.
5.1.4 Gas connections
The connection point shall be easily accessible and allow free range of movement of tightening tools.
For all appliances, the inlet connections shall have a thread which conforms to EN ISO 228-1 or with EN 10226-1 and EN 10226-2, or shall have a compression fitting. In the first case, the end of the inlet connection shall be sufficiently flat to allow the use of a sealing device.
The pipe carrying the inlet connections shall be fixed to the appliance body in a rigid fashion. The types of connection used in various countries are given in Table A.1.
However, for an appliance burning third family gases only, it is not mandatory to make the connection by means of a threaded joint or a compression fitting. It may also be made by a conical joint or by a flat joint.
5.1.5 Soundness
5.1.5.1 Soundness of the gas circuit
5.1.5.1.1 General
Sealing compounds shall be suitable for contact with the gas and for the mechanical and thermal conditions to which they are subjected.
Holes for screws, studs, etc.. intended for the assembly of components other than those carrying gas shall not open into gasways.
Pipework to movable parts of the appliance and subject to strain by mechanical movement shall meet the requirements of the tests described in 7.2.1 to ensure their operation (soundness, rate).
5.1.5.1.2 Assemblies designed to be dismantled.EN 203-1-2014 pdf download.