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GB/T 3787-2017 English PDF (GBT3787-2017)

GB/T 3787-2017 English PDF (GBT3787-2017)

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GB/T 3787-2017: Technical safety code for management, operation, inspection and maintenance of hand-held motor-operated electric tools

This Standard specifies the safety requirements for management, operation, inspection and maintenance of hand-held motor-operated electric tools. This Standard applies to the management, operation, inspection and maintenance of hand-held motor-operated electric tools.
GB/T 3787-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.140.20
K 64
Replacing GB/T 3787-2006
Technical safety code for management, operation,
inspection and maintenance of hand-held motor-
operated electric tools
ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. FEBRUARY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Management ... 6
5 Operation ... 7
6 Inspection and maintenance ... 8
Annex A (Informative) Periodic inspection record sheet ... 12
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 3787-2006, Technical safety code for management, operation, inspection and maintenance of hand-held motor-operated electric tools. Compared with GB/T 3787-2006, the major technical changes are as follows. -- it adds ?€?terms and definitions?€? (see Clause 3);
-- it adds that ?€?the transportation lithium batteries must comply with relevant domestic and international regulations?€? and deletes the ?€?methods for storage and maintenance of tools?€? (see Clause 4);
-- the narrative order of ?€?operation?€? of Clause 5 is adjusted, which is divided into 5.1 ?€?general provisions?€?, 5.2 ?€?classification of tools?€? applications?€?, 5.3 ?€?operation conditions?€? and 5.4 ?€?plugs and sockets?€?;
-- it adds the requirements for gripping and protective articles when operators are using tools (see Clause 5);
-- it adds the safety requirements for electric tools with water source (see Clause 5); -- it adds the non-operating current value of overcurrent relays (see 6.9); -- it adds table titles for Table 1 and Table 2 and changes the content of Table 1; -- it changes the relevant content in Annex A to the former standard by moving it to Clause 3;
-- it changes Annex B to the former standard into the informative annex ?€?periodic inspection record sheet?€? and adjust it to be Annex A.
This Standard was proposed by and shall be under the jurisdiction of National Technical Committee 25 on Electric Safety of Standardization Administration of China (SAC/TC 25).
The drafting organizations of this Standard. Shanghai Electric Tool Research Institute (Group) Co., Ltd., Machinery Industry Beijing Electrotechnical Institute of Economic Research, China Quality Certification Centre Shanghai Branch, Suzhou Electrical Apparatus Science Research Institute Co., Ltd., Cixi City Best Power Tools Co., Ltd., Zhejiang Chint Electric Co., Ltd.
The main drafters of this Standard. Gu Jing, Zhu Shanshan, Wu Wei, Hu Chun, Yu Liming, Zhang Yinglin, Li Xiaozhong.
Technical safety code for management, operation,
inspection and maintenance of hand-held motor-
operated electric tools
1 Scope
This Standard specifies the safety requirements for management, operation, inspection and maintenance of hand-held motor-operated electric tools (hereinafter referred to as tools).
This Standard applies to the management, operation, inspection and maintenance of hand-held motor-operated electric tools.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced documents (including all amendments) applies to this document.
GB/T 3883.1-2014, Safety of motor-operated hand-held, transportable electric tools and lawn and garden tools ?€? Part 1. General requirements
3 Terms and definitions
For the purposes of this document, the terms defined in GB/T 3883.1-2014 apply. 3.1
class I tool
It is such a tool that its protection against electric not only relies on basic insulation, double insulation or reinforced insulation, but also includes an additional safety measure, i.e. the easily accessible live parts and the protective earth leads for fixed wiring in the installations are connected to ensure the easily accessible live parts become electrically neutral in case of any damage of basic insulation. The tool is also deemed as a class I tool which has double insulation and/or reinforced insulation with a) the general job applications, where class II tools may be used;
b) the applications in damp sites or metal frameworks or other sites with good electrical conductivity, where class II or class III tools shall be used; c) the applications in boilers, metal containers and pipes, where class III tools or class II tools for which residual current action protectors of rated residual action current not greater than 30 mA are installed in electrical circuits.
5.3 Operation conditions
Include.
a) that the class I tools for general applications shall also be provided with the protective measures in electrical circuits such as residual current action protectors and isolation transformers;
b) that the safety isolation transformers for class III tools, the residual current action protectors for class II tools, and the power control boxes and power couplers for tools of classes II and III shall be placed outside the job sites. During the operation in a narrow job site, there shall be people outside for monitoring and guarding;
c) that tools of corresponding protection degrees shall be used in the job environment such as damp-heat and rain-snow;
d) when electric tools with water source are used, residual current action protectors shall be installed. For the requirements for rated residual action current and action time see the specifications of GB/T 3883.1-2014. And they shall be installed where it is not easy to dismantle them.
5.4 Plugs and sockets
Plugs and sockets.
a) the plugs of the power lines of tools shall not be dismantled or replaced randomly; b) the plugs and sockets of tools shall be correctly wired as specified; the protective earth electrodes in plugs and sockets shall only be connected separately with protective earth lines under any circumstance. It is prohibited to use leads to connect to protective electrodes and working neutral lines in plugs and sockets. 6 Inspection and maintenance
6.1 When tools are sent out or received, storemen shall carry out one routine inspection; before use, operators shall carry out routine inspection.
Between enclosure and metal parts isolated from live parts only using basic insulation in class II tools
f) tools passing periodic inspection shall be labelled with inspection ?€?pass?€? marking at appropriate location of tools. The ?€?pass?€? marking shall be distinctive, clear and correct, at least including.
1) the number of tools;
2) the name or sign of inspection organization;
3) the name or sign of inspection personnel;
4) the effective dates.
6.4 Tools which are not used for a long term, shall be subjected to the measurement of insulating resistance before operation. If the insulating values are smaller than the values specified in Table 1, they shall be subjected to drying treatment. They shall only be used after they pass the inspection and are labelled with the ?€?pass?€? marks. 6.5 In case of any insulation damage, fracture of power lines?€? sheath, falling-off of protective earth lines, crack of plugs and sockets or mechanical damage detrimental to safety, etc., it shall be repaired immediately. Before repair, their use shall not be continued.
6.6 The maintenance of tools shall be carried out by a maintenance organization approved by their manufacturer.
6.7 User and maintenance department shall not change the original design parameters of tools randomly, nor use alternative materials inferior to original materials used or parts not in conformity with the original specifications.
6.8 During maintenance, the insulating liners and buses in tools shall not be dismantled or omitted randomly; the power lines of tools shall not be replaced randomly. 6.9 After the electrical insulation parts of tools are repaired, in addition to the requirements of 5.1, 5.4 and 6.3 e), they shall also be subjected to the dielectric strength test in accordance with the requirements of Table 2. the waveform is of actual sinusoidal wave; the voltage is at a frequency of 50 Hz; the duration is 1 min. During the test, no flashover or breakdown will occur.
Table 2 ?€? Voltages for dielectric strength test
Location of test voltage applied
Test voltage/V
Class I tools Class II tools Class III tools
Between live parts and

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