Safety of household and similar electrical appliances - Part 20: Particular requirements for tumble dryers
1 Scope
This clause of GB/T 4706.1-2024 is replaced by the following.
This document specifies the safety requirements for household and similar use electric drum dryers.
This International Standard deals with the safety of electric tumble dryers intended for household and similar purposes, their rated voltage being not more than 250 V for single-
phase appliances and 480 V for other appliances.
Note 101: This standard applies to the drying function of washing machines having a drying cycle.
This standard also deals with the safety of tumble dryers that use a refrigerating system, incorporating sealed motor-compressors, for drying textile material. These appliances may use flammable refrigerants. Additional requirements for these appliances are given in Annex AA.
Appliances not intended for normal household use but which nevertheless may be a source of danger to the public, such as appliances intended to be used by laymen in shops, in light industry and on farms are within the scope of this standard.
Note 102: Examples of such appliances are tumble dryers for communal use in blocks of flats or in launderettes.
As far as is practicable, this standard deals with the common hazards presented by appliances that are encountered by all persons.
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 103: Attention is drawn to the fact that
——for appliances intended to be used in vehicles or on board ships or aircraft, 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.
Note 104: This standard does not apply to
——appliances intended 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);
——appliances incorporating steam generating devices in which steam is produced at a pressure exceeding 50 kPa.
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 Terms and definitions
This clause of GB/T 4706.1-2024 is applicable except as follows.
3.1 Definitions relating to physical characteristics
Replacement:
3.1.9
normal operation
operation of the appliance under the following conditions:
The appliance is operated filled with textile material having a mass in the dry condition equal to the maximum load stated in the instructions.
The textile material consists of pre-washed double-hemmed cotton sheets having dimensions approximately 70 cm × 70 cm and a specific mass between 140 g/m2 and 1 75 g/m2 in the dry condition. The textile material is soaked with water having a temperature of 25 °C ± 5 °C and a mass equal to that of the textile material.
If the drying function can automatically follow the washing function in a washing machine, the appliance is not separately loaded. The appliance is operated with the maximum quantity of textile material stated in the instructions for the combined washing-drying cycle.
Note 101: Cotton having a water content not exceeding 10 % is considered to be in the dry condition. Cotton conditioned for 24 h in still air, having a temperature of 20 °C ± 2 °C, a relative humidity between 60 % and 70 % and a pressure between 860 mbar and 1 060 mbar, will contain approximately 7 % water.
A steam generator intended to be filled by hand is filled according to the instructions, water being added to maintain the steam generation.
A steam generator intended to be filled automatically is connected to the water mains.
3.5 Definitions relating to types of appliances
3.5.101
tumble dryer
appliance in which textile material is dried by tumbling in a rotating drum through which
heated air is blown
3.5.102
condensation-type tumble dryer
tumble dryer in which the air used for the drying process is dehumidified by cooling
3.6 Definitions relating to parts of an appliance
3.6.101
steam generator
device in which steam is produced at a pressure not exceeding 50 kPa and in which the
pressure drops to atmospheric pressure when the steam is not supplied
3.8 Definitions relating to miscellaneous matters
3.8.101
cool down period
final part of the tumble dryer cycle where the drum is continuously rotated with reduced
power to the heating element and with air circulation in order to reduce the possibility of
spontaneous combustion of the clothes load
Note: Continuous rotation does not mean rotation in same direction if the intended operation is to reverse direction in normal use.
4 General requirement
This clause of Part 1 is applicable.
