ANNEX IU.K.ESSENTIAL REQUIREMENTS
3.DESIGN AND CONSTRUCTIONU.K.
The obligations arising for appliances from the essential requirements set out in this point apply also to fittings, as far as relevant.
3.1.GeneralU.K.
3.1.1.Appliances shall be so designed and constructed that, when normally used, no instability, distortion, breakage or wear likely to impair their safety may occur.U.K.
3.1.2.Condensation produced at the start-up and/or during use shall not affect the safety of appliances.U.K.
3.1.3.Appliances shall be so designed and constructed as to minimise the risk of explosion in the event of a fire of external origin.U.K.
3.1.4.Appliances shall be so designed and constructed that water and inappropriate air penetration into the gas circuit does not occur.U.K.
3.1.5.In the event of a normal fluctuation of auxiliary energy, appliances shall continue to operate safely.U.K.
3.1.6.Abnormal fluctuation or failure of auxiliary energy or its restoration shall not lead to an unsafe situation.U.K.
3.1.7.Appliances shall be so designed and constructed as to obviate any gas-related risks due to hazards of electrical origin. As far as relevant, the results of the conformity assessment in relation to the safety requirements of [the Radio Equipment Regulations 2017] or the safety objectives of [the Electrical Equipment (Safety) Regulations 2016] shall be taken into account.U.K.
3.1.8.Appliances shall be so designed and constructed as to obviate any gas-related risks due to hazards originating from electromagnetic phenomena. As far as relevant, the results of the conformity assessment in relation to the electromagnetic compatibility requirements of [the Radio Equipment Regulations 2017] or [the Electromagnetic Compatibility Regulations 2016] shall be taken into account.U.K.
3.1.9.All pressurised parts of an appliance shall withstand the mechanical and thermal stresses to which they are subjected without any deformation affecting safety.U.K.
3.1.10.Appliances shall be so designed and constructed that failure of a safety, controlling or regulating device may not lead to an unsafe situation.U.K.
3.1.11.If an appliance is equipped with safety and controlling devices, the functioning of the safety devices shall not be overruled by that of the controlling devices.U.K.
3.1.12.All parts of appliances which are set or adjusted at the stage of manufacture and which should not be manipulated by the user or the installer shall be appropriately protected.U.K.
3.1.13.Levers and other controlling and setting devices shall be clearly marked and give appropriate instructions so as to prevent any error in operation/use. Their design shall be such as to preclude accidental operation.U.K.
3.2.Unburned gas releaseU.K.
3.2.1.Appliances shall be so designed and constructed that the gas leakage rate is not dangerous.U.K.
3.2.2.Appliances shall be so designed and constructed that gas release at any state of operation is limited in order to avoid a dangerous accumulation of unburned gas in the appliance.U.K.
3.2.3.Appliances intended to be used in indoor spaces and rooms shall be so designed and constructed as to prevent the release of unburned gas in all situations which could lead to a dangerous accumulation of unburned gas in such spaces and rooms.U.K.
3.2.4.Appliances designed and constructed to burn gas containing carbon monoxide or other toxic components shall not present a danger to the health of persons and domestic animals exposed.U.K.
3.3.IgnitionU.K.
Appliances shall be so designed and constructed that, when normally used, ignition and re-ignition is smooth and cross-lighting is assured.
3.4.CombustionU.K.
3.4.1.Appliances shall be so designed and constructed that, when normally used, the combustion process is stable and combustion products do not contain unacceptable concentrations of substances harmful to health.U.K.
3.4.2.Appliances shall be so designed and constructed that, when normally used, there will be no accidental release of combustion products.U.K.
3.4.3.Appliances connected to a flue for the dispersal of combustion products shall be so designed and constructed that in abnormal draught conditions there is no release of combustion products in a dangerous quantity into the indoor spaces or rooms concerned.U.K.
3.4.4.Appliances shall be so designed and constructed that, when normally used, they do not cause a concentration of carbon monoxide or other substances harmful to health, such as they would be likely to present a danger to the health of persons and domestic animals exposed.U.K.
3.5.Rational use of energyU.K.
Appliances shall be so designed and constructed as to ensure rational use of energy, reflecting the state of the art and taking into account safety aspects.
3.6.TemperatureU.K.
3.6.1.Parts of appliances which are intended to be installed or placed in close proximity to surfaces shall not reach temperatures which present a danger.U.K.
3.6.2.The surface temperature of parts of appliances intended to be handled during normal use shall not present a danger to the user.U.K.
3.6.3.The surface temperatures of external parts of appliances, with the exception of surfaces or parts which are associated with the transmission of heat, shall not under operating conditions present a danger to the health and safety of persons exposed and in particular to children and elderly people, for whom an appropriate reaction time shall be taken into account.U.K.
3.7.Contact with food and water intended for human consumptionU.K.
Without prejudice to Regulations (EC) No 1935/2004() and (EU) No 305/2011() of the European Parliament and of the Council, materials and parts used in the construction of an appliance which may come into contact with food or water intended for human consumption as defined in Article 2 of Council Directive 98/83/EC(), shall not impair quality of the food or water.