Safety of household and similar electrical appliances - Part 34：Particular requirements for commercial electric forced convection ovens, steam cookers and steam–convection ovens
Safety of household and similar electrical appliances - Part 34: Particular requirements for commercial electric forced convectionovens, steam cookers and steam-convection ovens
1 Scope
This clause of GB/T 4706.1-2024 is replaced by the following.
This document deals with the safety of electrically operated commercial forced convection ovens, steam cookers, steam-convection ovens and, exclusive of any other use, steam generators, not intended for household and similar use, their rated voltage being not more than 250 V for single-phase appliances connected between one phase and neutral and 480 V for other appliances.
This document deals also with electrically operated commercial forced convection ovens, steam cookers, steam-convection ovens intended for use on board ships, for which Annex AA is applicable.
Note 101: These appliances are used for commercial processing of food, for example in kitchens of restaurants, canteens, hospitals and in commercial enterprises such as bakeries, butcheries, etc.
The electrical part of appliances making use of other forms of energy is also within the scope of this standard.
As far as is practicable, this standard deals with the common hazards presented by these
types of appliances.
Note 102: Attention is drawn to the fact that
– for appliances intended to be used in vehicles or aircrafts, additional requirements may be necessary;
——in many countries additional requirements are specified by the national health authorities, the national authorities responsible for the protection of labour, the national water supply authorities and similar authorities;
——in many countries additional requirements are specified for pressure appliances.
Note 103: This standard does not apply to
——appliances designed exclusively for industrial purposes;
——appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas);
——process appliances for continuous mass production of food;
——microwave ovens (IEC 60335-2-90);
2 Normative references
This clause of GB/T 4706.1-2024 is applicable except as follows.
Addition:
ISO 898-1 Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread
ISO 3506-1 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 1: Bolts, screws and studs
ISO 3506-2 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 2: Nuts
ISO 3506-3 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 3: Set screws and similar fasteners not under tensile stress
ISO 3506-4 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 4: Tapping screws
IEC 60068-2-6 Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal)
IEC 60068-2-27 Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock
IEC 60068-2-52 Environmental testing - Part 2: Tests - Test Kb: Salt mist, cyclic (sodium, chloride solution)
3 Terms and definitions
This clause of GB/T 4706.1-2024 is applicable except as follows.
3.1.4 Addition:
Note 101: The rated power input is the sum of the power inputs of all the individual elements in the appliance that can be on at one time; where there are several such combinations possible, that giving the highest power input is used in determining the rated power input.
3.1.9 Replacement:
normal operation
operation of the appliance under the following conditions
●Dry heat mode
The appliance is operated with all the shelves or the shelf trolley in position according to the manufacturer's instructions but with no load. The controls are set so that the mean value of the temperature over the thermostat cycle at the geometric centre of each usable space in the interior of the oven is maintained at 220 °C ± 4 °C. Stepped controls are set so that this temperature is 220 °C ± 1 5 °C.
For ovens that are unable to attain a temperature of 220 °C, the controls are set at the maximum.
For ovens that are capable of attaining temperatures in excess of 270 °C, the controls are set so that the mean value of the temperature is 50 °C ± 4 °C below the maximum temperature attainable.
●Steaming only mode
The appliance is operated in accordance with the manufacturer's instructions with all controls intended to be operated by the user adjusted to their maximum setting until reaching operating temperature. They are then readjusted, if possible, to the lowest setting that maintains that temperature.
Appliances with steam generators intended to be filled by hand or by a manually operated tap are filled to the indicated level on the steam generator.
Appliances with steam generators intended to be filled automatically are connected to a water supply having the pressure designated by the manufacturer. Where the manufacturer specifies a range of pressures, the pressure is adjusted to give the most unfavourable conditions.
The incoming water is maintained at
——15 °C ± 5 °C in the case of appliances intended for connection to a cold water supply;
——60 °C ± 5 °C or the temperature indicated in the instruction sheet, whichever is the higher, in the case of appliances intended for connection to a hot water supply only.
Note 101: If the appliance is intended for connection to either a hot or cold water supply, the temperature of the water is that which gives the most unfavourable results.
Lids, doors, and covers are in position and closed.
The cooking compartment of the appliance contains a water load, initially at 15 °C ± 5 °C, comprising 0.5 L/kg of the manufacturer's declared maximum food load. The water load is
evenly distributed between the shelves or pans.
Note 102: Since pans may be perforated to allow for circulation of steam, the water load may be contained in suitable containers evenly distributed over the shelves or pans.
●Combination mode
The appliance is operated as for the steaming only mode but with the forced convection fan/s and elements for heating the cooking compartment on and the temperature controls set as for the dry heat mode.
In all the above cases, motors incorporated in the appliance are operated in the intended manner under the most severe conditions that can be expected in normal use, taking into account the manufacturer's instructions.
3.101
forced convection oven
an appliance intended for the cooking of food by heated air that is circulated by mechanical means within the cooking compartment. The pressure within the cooking compartment does not differ significantly from atmospheric pressure
3.102
steam cooker
an appliance intended for the cooking of food only by means of direct steam contact. The pressure within the cooking compartment can exceed atmospheric pressure
3.103
atmospheric steam cooker
an appliance in which the pressure within the cooking compartment does not differ significantly from atmospheric pressure
3.104
steam-convection oven
an appliance intended for the cooking of food either by means of direct steam contact or by heated air circulated by mechanical means within the cooking compartment or by a combination of these two modes. The pressure within the cooking compartment does not
differ significantly from atmospheric pressure
3.105
rated pressure
the maximum working pressure of steam cookers and steam generators assigned by the manufacturer to the pressurized parts of the appliance
3.106
steam generator
that part of the appliance designed specifically for the generation of steam for exclusive use in a cooking compartment
Note: The steam generator may be either combined within the cooking compartment, remote from the cooking compartment but contained within the same casing or function as a separate unit providing steam for one or more cooking compartments.
3.107
cooking compartment
that part of the appliance in which the cooking or food heating process takes place
3.108
indicated level
a mark on the appliance or steam generator to indicate the maximum liquid level for correct operation
3.109
installation wall
a special fixed construction containing supply facilities for appliances installed in conjunction with it
3.110
functional surface
surface that is intentionally heated by an internal heat source and has to be hot to carry out the function for which the appliance is intended
Note: An example is the heated sheath of a tubular heating element.
