GB/T 4706.90-2024Safety of household and similar electrical appliances - Part 90: Particular requirements for commercial electric microwave ovens (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 90 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 4706.90-2014 "Particular requirements for safety of commercial microwave ovens for household and similar electrical appliances" and Compared with GB 4706.90-2014, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

--- Changed the term "clearance area" to "unloading area" (see 3.119, 3.119 of the 2014 edition);

--- Added the term and definition of "thermal functional surface" (see 3.128);

--- Changed the instructions for use of commercial road vehicles and the appliance cannot be cleaned with a steam cleaner (see 7.12, 2014 Version 7.12);

--- Added the marking requirements for hot surfaces specified in 7.15 (see 7.15);

--- Changed the following information. When the temperature rise of the enclosure of the electric appliance does not meet the requirements, the maximum temperature rise shall not exceed twice the temperature rise shown (see 11.8, 2014 version 11.8);

--- Added alternative measurement methods when microwave leakage exceeds 100W/m2 (see Chapter 13, Chapter 13 of the 2014 edition);

--- Added requirements for door interlocking (see 22.103.1 and 22.103.2);

--- Added that appliances installed on commercial road vehicles, coaches, food stalls and similar vehicles should be able to withstand the vibration (see 22.120);

--- Added the following provisions for appliances controlled by programmable electronic circuits that limit the number of heating elements and motors that are energized at the same time.

Any combination of activation of the heating element and the motor shall not result in an unsafe content of the appliance (see 22.121);

--- Added that for class I appliances, one pole of the power output of the microwave generator (if any) is functionally grounded (see 27.1

Note 101);

--- Added instructions for applicable standards for different combination microwave ovens (see Appendix AA);

--- Changed the requirement for installing barrier devices in the loading and unloading areas where ordinary people pick up and place microwave loads for transmission type appliances.

Seek (see BB.22.119.4, 2014 edition of BB.22.119.4);

--- Changed some contents of Appendix EE (see EE.7.1, EE7.12 and EE.11, 2014 edition of EE.7.1, EE.7.12 and EE.11);

--- Added that the shelf should have a non-removable non-slip top surface and gave test requirements (see EE.22.103).

This document is equivalent to IEC 60335-2-90:2019 "Safety of Household and Similar Electrical Appliances Part 2-90.Commercial Microwave Ovens" Special Requirements.

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 90: Particular Requirements for Commercial Microwave Ovens", and the standard was enhanced the coordination of the system.

Introduction

GB/T 4706 "Safety of Household and Similar Electrical Appliances" adopts IEC 60335 for the most part.

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 90: Particular requirements for commercial microwave ovens

1 Scope

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

This document specifies the safety requirements for commercial microwave ovens with doors. For single-phase appliances connected to a phase and neutral conductor, the rated the voltage shall not exceed 250V, and other appliances shall not exceed 480V.

This document applies to the safety of combination microwave ovens with a door, the requirements of which are contained in Annex AA.

This document also applies to the safety of commercial microwave ovens without a door, where food or beverages are heated by transporting them into the oven cavity.

Please include it in Appendix BB.

Appendix BB applies to microwave ovens whose microwave load enters the oven cavity through a transport device; Appendix BB also applies to tunnel microwave ovens and

Requirements for several microwave vending machines.

This document also applies to microwave ovens intended for use on board ships, the requirements for which are contained in Annex EE.

NOTE 101 For microwave ovens without a door and in a transport unit as described in Annex BB, all provisions of this document apply to such microwave ovens, except Otherwise specified in Appendix BB.

This document takes into account the average person who is in the unloading area of a vending machine.

NOTE 102 The equipment may be embedded in a vending machine, in which case IEC 60335-2-75 also applies.

NOTE 103 Appliances using energy sources other than electrical energy are within the scope of this document.

This document does not generally consider the following.

--- Use of the appliance by unattended children and disabled persons;

--- Condition of children's play equipment.

This document does not consider the use of microwave ovens without doors and in transport devices by ordinary people, but near the entrance and exit except.

NOTE 104 The principles of specific microwave leakage conditions and the measurement of related microwave energy are limited to the open structure described in Appendix BB.

Note 105.Pay attention to the following.

--- For equipment intended for use on vehicles, ships or aircraft, additional requirements may be required;

--- For appliances used in tropical countries, special requirements may be required;

--- In many countries, additional requirements imposed by national health, labor protection and other similar authorities;

--- In many countries, the additional requirements of Appendix BB.22.119.1 are established by national authorities.

Note 106.This document does not apply to.

---Household microwave ovens including combination microwave ovens (IEC 60335-2-25);

--- Industrial microwave heating equipment (IEC 60519-6);

--- Medical devices (IEC 60601);

--- Appliances intended for use in special environments where corrosive or explosive gases (such as steam or combustible gases, etc.) often occur.

2 Normative references

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

IEC 60068-2-6 Environmental testing - Part 2: Test Fc. Vibration (sinusoidal) 2-6.Tests-TestFc.Vibration(sinusoidal)]