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GB/T 3787-2017 (GB/T3787-2017)

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GB/T 3787-2017: PDF in English (GBT 3787-2017)
GB/T 3787-2017
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
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
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
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.
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
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
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
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
(Above excerpt was released on 2018-07-21, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT3787-2017