Detail of GB/T 4706.8-2024

Introduction of GB/T 4706.8-2024

GB/T 4706.8-2024 Safety of household and similar electrical appliances - Part 8: Particular requirements for blankets , pads, clothing and similar flexible heating appliances 1 Scope This clause of GB/T 4706.1-2024 is replaced by the following. This standard deals with the safety of electric blankets, pads, clothing and other flexible appliances that heat the bed or human body, for household and similar purposes. This standard applies to the appliances with the rated voltage being not more than 250 V. This standard also applies to control units supplied with the appliance. This standard also applies to appliances intended for normal household use but which nevertheless may be a source of danger to the public, such as appliances intended to be used in beauty parlours or by persons in cold ambient temperatures. Requirements and tests for clothing are given in Annex CC. As far as is practicable, 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: Children are considered to be old enough to use an appliance without supervision when they have been adequately instructed by a parent or guardian and are deemed competent to use the appliance safely. Note 102: 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; – additional requirements may be specified by the national health authorities concerned. Note 103: This standard does not apply to – 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); – rigid bed warmers, such as those of metal or ceramic material; – water bed heaters (GB/T 4706.58); – heating appliances for breeding and rearing animals (GB/T 4706.47); – foot warmers and heating mats (GB/T 4706.80); – appliances specifically intended for use under medical supervision (IEC 60601-2-35). 2 Normative references This clause of GB/T 4706.1-2024 is applicable except as follows. Addition: IEC 60320-1:2007 Appliance couplers for household and similar general purposes- Part 1:General requirements Note: GB/T 17465.1-2009 Appliances couplers for household and similar general purposes - Part 1 : General requirements (IEC 60320-1:2007, MOD) ISO 2439 Flexible cellular polymeric materials- Determination of hardness (indentation technique) Note: GB/T 10807-2006 Flexible cellular polymeric materials - Determination of hardness (indentation technique) (ISO 2439:1997.IDT) ISO 3758:2005 Textiles - Care labelling code using symbols Note: GB/T 8685-2008 Textiles - Care labelling code using symbols (ISO 3758: 2005, MOD) ISO 7000:2014 Graphical symbols for use on equipment Registered symbols ISO/IEC Guide 37 Instructions for use of products by. consumers interest) Note: GB/T 5296.1-2012 Instructions for use of products of consumer interest - Part 1 : General principles (ISO/ IEC Guide 37:1995, MOD) 3 Terms and 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: – blankets and pads are placed between sheets of thermal insulation; – duvets are placed on a sheet of thermal insulation but not covered; – mattresses are covered by a sheet of thermal insulation Note 101: The specification for the thermal insulation is given in Annex AA. The flexible part is supported on a plywood base 20 mm thick and positioned not less than 300 mm above the floor. The size of the plywood base is such that the thermal insulation can be fully supported over its entire area. The size of the sheets of thermal insulation is such that the edges extend at least 100 mm beyond the outline of the heated area. Control units held in the hand when they are actuated and cord switches are positioned to hang away from the plywood base. Other control units are placed on a supporting surface away from the plywood base. 3.101 flexible part all layers of material forming the permanent enclosure of the appliance together with the heating element, electro-conductive textile, thermostats and all other current-carrying parts contained within it Note: The flexible part may be inside a detachable cover. 3.102 blanket appliance comprising a substantially flat flexible part that is intended to form part of the bedding, for heating the bed 3.103 underblanket blanket intended to be used under the occupant of the bed 3.104 Void 3.105 overblanket blanket intended to be used over the occupant of the bed 3.106 duvet quilted overblanket intended to be used without additional bedding over the occupant of the bed, the heating element, electro-conductive textile, providing supplementary heat 3.107 pad appliance comprising a flexible part having a heated area not exceeding 0.3 m2 on each face and which is intended to heat part of the human body If the pad is constructed in a cylindrical or similar form, the limit for the heated area is 0.6 m2. 3.108 mattress appliance for supporting the bedding human body and which incorporates an upholstered flexible part for heating the bed Note: The appliance may be placed on the floor and referred to as a mat. 3.109 controlled appliance appliance incorporating means in the flexible part, such as heating elements with PTC characteristics or other means, for sensing changes in temperature when the appliance is operated under normal operation, thus automatically controlling the average power input 3.110 heating element heating conductor, including the core on which it is wound and the insulation any core and insulation, together with any other integrated conductor 3.111 heated area area of the flexible part enclosed within the outer perimeter of the heating element or electro-conductive textile It includes a margin outside the perimeter that has a width equal to 0.5 times the average distance between adjacent runs of the heating element. The heated area includes the return length of the heating element if the average distance between this part and the adjacent heating element does not exceed the average distance between adjacent runs of the heating element. If a blanket or mattress has two separate heated areas, the surface between the two areas is considered to be part of the heated areas, if at any place the distance between the two heating elements does not exceed 1.5 times the average distance between adjacent runs of the heating element. 3.112 moisture-proof appliance appliance having a flexible part that is suitable for use under moist conditions 3.113 bonded enclosure enclosure of the flexible part that has the opposite faces joined together by means of an adhesive or by welding 3.114 control unit device, other than a multi-position cord switch, that does not incorporate components for regulating the power input, external to the flexible part, by means of which the average power input of the appliance can be adjusted or regulated Note: Control units may be incorporated in the supply cord or at the end of an interconnection cord. 3.115 wrap appliance comprising a flexible part intended to be draped over the human body in order to keep it warm 3.116 electro-conductive textile textile material incorporating carbon or other conductive material substance, together with any associated insulation, which is connected to a pair of electrodes for the purpose of providing a uniformly heated surface 3.117 heating element with PTC characteristics heating element consisting of a pair of conductors separated by conductive material that has a rapid non-linear increase in resistance when the temperature is raised through a particular range

Contents of GB/T 4706.8-2024