GB/T 4706.51-2024Safety of household and similar electrical appliances - Part 51: Particular requirements for commercial electric appliances for keeping food and crockery warm (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is Part 51 of GB/T 4706 "Safety of Household and Similar Electrical Appliances". GB/T 4706 has been published as follows part.

--- Part 1: General requirements;

--- Part 2: Particular requirements for electric irons;

--- Part 121: Particular requirements for professional ice cream machines.

This document replaces GB 4706.51-2008 "Safety of household and similar electrical appliances for commercial use of electric food and ceramic tableware warmers" Compared with GB 4706.51-2008, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

--- Changed the category of protection against electric shock of equipment (see 6.1, 6.1 of the 2008 edition);

--- Changed the marking instructions for appliances, deleted the dangerous voltage marking and warning, and added marking and warning for appliances with external easily accessible surfaces Requirements (see 7.1, 7.1 of the 2008 edition);

--- Deleted the equipotential symbol (see 7.6 of the 2008 edition);

--- Added the contents that should be clearly stated in the instructions, such as whether it is intended for commercial use or limited scope of use (see 7.12);

--- Added the height requirements for the triangle used in symbol 5041 (2002-10) specified in IEC 60417 (see 7.14);

--- Added marking requirements for external accessible surfaces when the appliance is in normal operation (see 7.15);

--- Added normative reference to IEC 60584-1:2013 for thermocouple electromotive force specifications and tolerances (see 11.3);

--- Added the determination of stable state and the interaction between the appliance and other appliances (see 11.7);

--- Added the maximum temperature rise of the specified external accessible surface under normal working conditions (see 11.8, Table 101);

--- Changed the allowable value of leakage current for class I stationary appliances and the allowable value of leakage current for class I portable appliances (see 13.2, 16.2, 13.2 and 16.2 of the 2008 edition);

--- Added the components of overflow solution rinse agent (see 15.2, Table 102);

--- Added normative references to the mechanical properties requirements of carbon steel and alloy steel fasteners, corrosion-resistant stainless steel fasteners ISO 898-1, ISO 3506-1, ISO 3506-2, ISO 3506-3 and ISO 3506-4 (see 28.1, 28.4);

--- Changed the glow-wire test conditions and basis (see 30.2.1, 30.2.1 of the 2008 edition).

This document is equivalent to IEC 60335-2-49:2017 "Household and similar electrical appliances - Safety - Part 2-49.Commercial electric heating of food and Special Requirements for Ceramic Tableware Warmers.

The following minimal editorial changes were made to this document.

--- The name of the standard was changed to "Safety of Household and Similar Electrical Appliances Part 51: Commercial Electric Food and Ceramic Tableware Warmers Special Requirements" to enhance the coordination of the standard system;

--- Add the table number and title to the table below 15.2 of IEC 60335-2-49:2017 as "Table 102 Rinse agent composition", and change the original Table 102 was "Table 103 Assembly torques for threaded connections providing ground continuity";

---Correct IEC 60584-1 in the reference number description B of Figure 103 of IEC 60335-2-49:2017 to IEC 60584-1:2013;

--- Correct "6.3" in Appendix N of IEC 60335-2-49:2017 to "10.1".

Introduction

GB/T 4706 "Safety of Household and Similar Electrical Appliances" adopts most of IEC 60335.On this basis, GB/T 4706 refers to the structure of IEC 60335 is divided into several parts, consisting of general requirements and special requirements. Part 1 is general requirements, and the other parts are for products covered by special requirements, their safety requirements are general requirements used in combination with the special requirements.

The requirements include supplements and modifications to the corresponding clauses in the general requirements to provide complete requirements for each product.

This document is the protection requirements for electrical, mechanical, thermal, fire and radiation risks when the appliance is used normally in accordance with the instructions.

This document also covers abnormal conditions that may occur during use and considers how electromagnetic interference may affect the safe operation of the equipment.

This document has taken into account the requirements specified in GB/T 16895 "Low Voltage Electrical Installations". The appliance is connected to the power supply in accordance with the electrical wiring rules.

requirements are coordinated.

If multiple functions of an appliance involve other parts of GB/T 4706, the other parts shall apply to the appliance separately as long as it is reasonable.

Each function. If applicable, consider the impact of one function on other functions.

When no additional requirements are given in other parts for hazards already included in this document, GB/T 4706.1 applies.

GB/T 4706 is a standard covering appliance safety and takes precedence over general standards/horizontal standards covering the same subject.

This document is used in conjunction with GB/T 4706.1-2024 "Safety of Household and Similar Electrical Appliances Part 1: General Requirements".

The part marked "applicable" in the document indicates that GB/T 4706.1-2024 "Safety of Household and Similar Electrical Appliances - Part 1: General Requirements" the corresponding clauses in the "Requirements" shall apply to this document; for the parts marked "replace" in this document, the clauses in this document shall prevail;

The "Add" part indicates that in addition to complying with the corresponding clauses in GB/T 4706.1-2024, the additional clauses in this document must also be complied with.

Clause; The part marked "modified" in this document indicates that the corresponding clauses of GB/T 4706.1-2024 are modified.

Safety of household and similar electrical appliances Part 51: Commercial electrically heated food and ceramic tableware Special requirements for insulators

1 Scope

This chapter of GB/T 4706.1-2024 is replaced by the following.

This document specifies the safety requirements for commercial electric food and ceramic tableware warmers not intended for household use.

This document applies to commercial electric food heating appliances with a rated voltage not exceeding 250V for single-phase appliances and 480V for other appliances and a ceramic dish warmer.

Examples of appliances that fall within the scope of this document are.

--- Food holding cabinets, with or without heated top surfaces;

---Heating top surface;

---Heating display cabinet;

---Heating ceramic tableware dispenser;

---Heating table;

---Radiant heater.

NOTE 101 Such appliances are suitable for use in commercial food processing, for example in restaurants, canteens, hospital kitchens and commercial enterprises such as bakeries and butchers.

The electrical parts of appliances using other forms of energy are also within the scope of this document.

To the extent practicable, this document deals with the common hazards arising from this type of apparatus.

Note 102.Pay attention to the following.

--- For appliances intended for use exclusively in vehicles, vessels or aircraft, necessary additional requirements may be permitted;

--- The relevant national management departments may impose additional requirements on the equipment;

---Appliances intended for outdoor use may require additional requirements.

Note 103.This document does not apply to.

---Appliances designed for industrial use;

--- Apparatus intended for use in locations where special conditions often occur, such as the presence of corrosive or explosive atmospheres (dust, vapor or flammable gases);

---Utensils for continuous mass production of food;

--- Water bath incubator (IEC 60335-2-50).

2 Normative references

Except for the following contents, this chapter of GB/T 4706.1-2024 applies.

Increase.

ISO 898-1 Mechanical properties of carbon steel and alloy steel fasteners Part 1: Bolts, screws and studs of specified property grades Coarse thread and fine thread (Mechanical properties of fasteners made of carbon steel and loy steel - Part 1.

Bolts,screwsandstudswithspecifiedpropertyclasses-Coarsethreadandfinepitchthread) 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, bolts and other fasteners of specified grades and property classes Screws and studs (Fasteners-Mechanical properties of corrosion-resistant stainless steel fasteners-