Safety of household and similar electrical appliances - Part 55 : Particular requirements for warming plates and similar appliances
1 Scope
This clause of GB/T 4706.1-2024 is replaced by the following.
This standard deals with the safety of electric warming plates, warming trays and similar appliances intended to keep food or vessels warm, for household and similar purposes.
This standard applies to the electric warming plates, warming trays and similar appliances intended to keep food or vessels warm, for household and similar purposes, with their rated voltage being not more than 250 V. It also applies to the appliances intended for normal household use and similar purposes and the appliances intended to be used by laymen in shops, in light industry and on farms.
However, if the appliance is intended to be used professionally to keep vessels warm or to process food for commercial consumption, the appliance is not considered to be for household and similar use only.
This standard deals with the common hazards presented by appliances that are encountered by all persons in and around the home. However, in general, it does not take into account
– persons (including children) whose
? physical, sensory or mental capabilities; or
? lack of experience and knowledge
prevents them from using the appliance safely without supervision or instruction;
– children playing with the appliance.
Note 101: Attention is drawn to the fact that
– for appliances intended to be used in vehicles or on board ships or in aircraft, additional requirements may be necessary;
– additional requirements may be specified by the national health authorities concerned.
Note 102: This standard does not apply to
– appliances made of flexible material, such as textile material;
– appliances intended exclusively to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– appliances intended exclusively for commercial catering or industrial purposes.
2 Normative references
This clause of GB/T 4706.1-2024 is applicable except as follows.
Addition:
IEC 60584-1 Thermocouples – Part 1: EMF specifications and tolerances
Note: GB/T 16839.1-2018 Thermocouples - Part 1 : EMF specifications and tolerances (IEC 60584-1:2013, IDT)
3 Definitions
This clause of GB/T 4706.1-2024 is applicable except as follows.
3.1.9 Replacement:
normal operation
operation of the appliance under the following conditions
The appliance is operated with a shallow pan, 150 mm in diameter and filled with water to a height of at least 25 mm, placed on the heated surface. If vessels are supplied with the appliance, or specified in the instructions, these are used instead.
The appliance is operated without a pan if this condition is more unfavourable.
3.6.1 01
hot functional surface
surface that is intentionally heated by an internal heat source and that has to be hot to carry out the intended function of the appliance
4 General requirement
This clause of GB/T 4706.1-2024 is applicable.
5 General conditions for the tests
This clause of GB/T 4706.1-2024 is applicable except as follows.
5.2 Addition:
Note 101: If the test of 15.101 has to be carried out, three additional samples are required.
6 Classification
This clause of GB/T 4706.1-2024 is applicable.
7 Marking and instructions
This clause of GB/T 4706.1-2024 is applicable except as follows.
7.1 Addition:
Appliances intended to be partially immersed in water for cleaning shall be marked with the maximum level of immersion and with the substance of the following:
Do not immerse beyond this level.
When the provisions of footnote b to Table 101 apply, the appliance shall be marked with:
– the substance of “CAUTION: Hot surface”, or
– symbol GB/T 5465.2-2023-5041.
7.6 Addition:
[symbol GB/T 5465.2- 2023-5041] Caution, hot surface
7.1.2 Addition:
The instructions shall include the substance of the following:
This appliance is intended to be used in household and similar applications such as:
– staff kitchen areas in shops, offices and other working environments;
– farm houses;
– by clients in hotels, motels and other residential type environments;
– bed and breakfast type environments.
Note 101: If the manufacturer wants to limit the use of the appliance to less than the above, this has to be clearly stated in the instructions.
The instructions for appliances incorporating an appliance inlet, and intended to be partially or completely immersed in water for cleaning, shall state that the connector must be removed before the appliance is cleaned and that the appliance inlet must be dried before the appliance is used again. The instructions for appliances intended to be used with a connector incorporating a thermostat shall state that only the appropriate connector must be used.
The instructions for appliances having surfaces of glass-ceramic or similar material that forms part of the enclosure of live parts shall include the substance of the following:
WARNING: Do not use the appliance if the surface is cracked. The instructions for appliances that have to be used with particular vessels that are not supplied shall specify the vessels to be used.
If symbol GB/T 5465.2-2023-5041 is marked on appliances, its meaning shall be explained and location of areas where the limits are exceeded shall be stated or shown by a drawing.
7.14 Addition:
The height of the triangle in symbol GB/T 5465.2-2023-5041 shall be at least 10 mm.
Compliance is checked by measurement.
7.15 Addition:
The marking specified for hot surfaces shall be clearly visible when the appliance is operated as in normal use, including when actuating any switch, adjusting any control or opening a lid or door. It shall not be placed on a hot functional surface or on surfaces that are exempted from the limits of Table 101.
8 Protection against access to live parts
This clause of GB/T 4706.1-2024 is applicable.
9 Starting of motor-operated appliances
This clause of GB/T 4706.1-2024 is not applicable.
10 Power input and current
This clause of GB/T 4706.1-2024 is applicable.
11 Heating
This clause of GB/T 4706.1-2024 is applicable except as follows.
11.2 Modification:
Portable appliances are placed away from the walls of the test corner.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test probe of Figure 101 is used to measure the temperature rises of external accessible surfaces specified in Table 101. The probe is applied with a force of 4 N ± 1 N to the surface in such a way that the best possible contact between the probe and the surface is ensured. The measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any measuring instrument giving the same results as the probe in Figure 101 may be used.
11.7 Replacement:
Appliances are operated until steady conditions are established.
11.8 Addition:
When an appliance connector incorporates a thermostat, the temperature rise limit for the pins of the inlet does not apply.
Addition:
During the test, the temperature rises are monitored continuously and shall not exceed the values shown in Table 101.
