Safety of household and similar electrical appliances - Part 51: Particular requirements for commercial electric appliances for keeping food and crockery warm
GB/T 4706.51-2024 Safety of household and similar electrical appliances - Part 51 : Particular requirements for commercial electric appliances for keeping food and crockery warm
1 Scope
This clause of GB/T 4706.1-2024 is replaced by the following:
This standard specifies the safety of electrically operated commercial hot cupboards appliances for keeping food and crockery warm not intended for household and similar use.
This standard is applicable to electrically operated commercial hot cupboards appliances for keeping food and crockery warm whose rated voltage being not more than 250 V for single-phase appliances connected between one phase and neutral, and 480 V for other appliances.
Examples of appliances that are within the scope of this standard are:
– hot cupboards, with or without heated tops;
– heated tops;
– heated display cases;
– heated crockery dispensers;
– heated tables;
– radiant heaters.
Note 101: These appliances are used for processing food, for example in kitchens of restaurants, canteens, hospitals and similar 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 on board ships or aircraft, additional requirements may be necessary;
− in many countries additional requirements may be specified by the management health authorities;
− for appliances intended to be used outdoors, additional requirements may be necessary.
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);
− appliances for continuous process appliances for the mass production of food;
− bains-marie (IEC 60335-2-50).
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
Note: GB/T 3098.1-2010 Mechanical properties of fasteners - Bolts, screws and studs (ISO 898- 1: 2009, MOD)
ISO 3506-1 Fasteners - Mechanical properties of corrosion-resistant stainless steel fasteners-Part 1 : Bolts, screws and studs with specified grades and property classes
Note: GB/T 3098.6-2023 Mechanical properties of fasteners - Stainless steel bolts, screws and studs (ISO 3506- 1 :2020, MOD)
ISO 3506-2 Fasteners- Mechanical properties of corrosion- resistant stainless steel fasteners - Part 2 : Nuts with specified grades and property classes
Note: GB/T 3098.15-2023 Mechanical properties of fasteners - Stainless steel nuts (ISO 3506-2 : 2020, MOD)
ISO 3506-3 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 3: Set screws and similar fasteners not under tensile stress
Note: GB/T 3098.16- 2014 Mechanical properties of fasteners - Stainless steel set screws ( ISO 3506- 3:2009, MOD)
ISO 3506-4 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 4: Tapping screws
Note: GB/T 3098.21-2014 Mechanical properties of fasteners - Stainless steel tapping screws (ISO 3506-4: 2009, MOD)
IEC 60584-1:2013 Thermocouples- Part 1 : EMF specifications and tolerances
Note: GB/T 16839.1-2018 Thermocouples - Part 1 : EMF specifications and tolerances (IEC 60584-1:201, IDT)
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
Appliances are operated empty and with any controls intended to be operated by the user set at the maximum.
If the appliance cannot be operated empty, then the manufacturer's instructions are taken into account.
Doors, covers or lids, if any, are placed in their intended positions.
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.
Appliances incorporating induction heating sources are operated with the induction crockery placed on induction trays. All tray supports are loaded, but partial up to full load shall be possible.
All controls are set to maximum, and the induction crockery is half-filled with initially cold water. Covers (cloches) are in their position.
The appliances consist of several units, which can form up to three separated modules; they are connected together during operation. These units are the heating module with the induction heating source, the rack with the coil carriers and the enclosure with the supports for the induction trays including the induction crockery.
3.101
hot cupboard
an appliance that is used for maintaining the temperature of hot food and for the warming of crockery
3.102
heated top
the top surface of a hot cupboard, that is designed to maintain the required temperature. It may be heated indirectly by the hot cupboard heating elements or directly by separate heating elements
3.103
heated display case
a hot cupboard in which food is displayed, the heated food being served from the display
3.104
heated crockery dispenser
an appliance designed specifically for the storage, warming and dispensing of plates, etc.
3.105
installation wall
a special fixed construction containing supply facilities for appliances installed in conjunction with it
3.106
heated table
appliance designed for warm-holding on the surface
3.107
radiant heater
stationary appliance for keeping food and crockery warm by means of radiant heat
Note: A part of the appliance can be swivelling.
3.108
heating unit
any part of an appliance that fulfils an independent cooking or heating function
3.109
induction heating source
heating source that operates by inducing eddy currents in induction crockery
3.110
coil carrier
insulation device containing the induction winding
3.111
induction crockery
crockery suitable to be heated by induction for heating up or keeping food warm
3.112
induction tray
tray adapted to induction crockery, as recommended by the manufacturer
3.113
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.
3.114
adjacent surface
surface adjacent to a functional surface and which can become hot through conduction
