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GB/T 17045-2020 English PDF (GBT17045-2020)

GB/T 17045-2020 English PDF (GBT17045-2020)

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GB/T 17045-2020: Protection against electric shock -- Common aspects for installations and equipment

GB/T 17045-2020
Protection against electric shock - Common aspects for installations and equipment ICS 13.260;29.020;91.140.50
National Standards of People's Republic of China
Replace GB/T 17045-2008
General parts of electric shock protection devices and equipment
2020-03-31 released
2020-10-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Basic rules for protection against electric shock 10
4.1 Overview 10
4.2 Normal conditions 11
4.3 Single fault condition 11
4.4 Additional protection 12
4.5 Protection against electric burns 12
4.6 Protection from physiological effects that do not affect health 12
5 Protection regulations (elements of protection measures) 13
5.1 Overview 13
5.2 Provisions for basic protection 13
5.3 Provisions for fault protection 15
5.4 Provisions for strengthening protection 18
5.5 Provisions for additional protection 19
6 Protective measures 19
6.1 Overview 19
6.2 Protection with automatic power-off 19
6.3 Protection with double or reinforced insulation 20
6.4 Protection by protective equipotential bonding 20
6.5 Protection with electrical separation 20
6.6 Protection with non-conductive environment (low voltage) 20
6.7 Protection with SELV system 20
6.8 Protection by PELV system 20
6.9 Adopt protection to limit steady-state contact current and energy 21 6.10 Additional protection 21
6.11 Other protective measures 21
7 Coordination of electrical equipment and protection regulations in electrical installations 21 7.1 Overview 21
7.2 Class 0 equipment 22
7.3 Class I equipment 22
7.4 Class II equipment 23
7.5 Class III equipment 24
7.6 Touch current and protective conductor current 25
7.7 Safety and minimum spacing of high-voltage installations and danger warning 27 7.8 Functional ground 27
8 Special operating and maintenance conditions 27
8.1 Overview 27
8.2 Components and replacement parts expected to be manually operated 27 8.3 Electrical data after isolation 28
8.4 Isolating appliances 28
Appendix A (informative appendix) List of protective measures implemented by protective regulations 31 Reference 33
Term Index 34
This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 17045-2008 "General Parts of Electric Shock Protection Devices and Equipment", and is consistent with GB/T 17045-2008 The main technical changes are as follows.
---The content of IEC 60449 (Voltage Section of Building Electrical Installations) has been added (see 4.2); ---Added the content that distinguishes regulations and measures well (see 3.44, 3.45 and Appendix A); ---Added effects other than ventricular fibrillation (see 4.6 and 7.6.5); ---Added additional protection content (see 5.5 and 6.10);
---Added the definition of extra low voltage (ELV) as part of low voltage (LV) (see 4.2); ---Added the requirements for isolating electrical appliances suitable for low-voltage automatic cut-off of power (see 8.4); --- Amend and move the current-related requirements in the protective conductor to the standard text (see 7.6.3). The translation method used in this standard is equivalent to IEC 61140.2016 "General Parts of Electric Shock Protection Devices and Equipment". The Chinese documents that have consistent correspondence with the normatively cited international documents in this standard are as follows. ---GB/T 156-2017 standard voltage (IEC 60038.2009, MOD);
---GB/T 311.1-2012 Insulation coordination Part 1.Definitions, principles and rules (IEC 60071-1.2006, MOD); ---GB/T 311.2-2013 Insulation coordination Part 2.Guidelines for use (IEC 60071-2.1996, MOD); ---GB/T 1985-2014 high voltage AC isolating switch and grounding switch (IEC 62271-102.2001 A1.2011, MOD); ---GB/T 4026-2019 Basic and safety rules for human-machine interface logo identification, equipment terminals, conductor terminals and conductor identification (IEC 60445.2017, IDT); ---GB/T 4208-2017 enclosure protection class (IP code) (IEC 60529.2013, IDT); ---GB/T 5465.2-2008 Graphical symbols for electrical equipment Part 2.Graphical symbols (IEC 60417DB.2007, IDT); ---GB/T 12113-2003 Measurement method of touch current and protective conductor current (IEC 60990.1999, IDT); ---GB/T 13870.5-2016 The effect of electric current on humans and livestock Part 5.The contact voltage threshold of physiological effects (IEC TR60479-5.2007, IDT); ---GB/T 16499-2017 Preparation of electrical and electronic safety publications and application guidelines for basic safety publications and multi-disciplinary shared safety publications (IEC Guide104.2010, NEQ); ---GB/T 16935 (all parts) Insulation coordination of equipment in low-voltage systems [IEC 60664 (all parts)]; ---GB/T 20002.4-2015 standard drafting of specific content. Part 4.Standards involving safety content (ISO /IEC Guide51.2014, MOD). This standard has made the following editorial changes.
--- Change Appendix B of IEC 61140.2016 to term index;
--- Since the content of Appendix C of IEC 61140.2016 has nothing to do with my country, it is deleted in this standard. This standard was proposed and managed by the National Standardization Technical Committee for Building Electrical Installations (SAC/TC205). Drafting organizations of this standard. CMC China Design and Research Institute Co., Ltd., Unitech (China) Co., Ltd., Schneider Electric (China) Co., Ltd., Siemens (China) Co., Ltd., Legrand Low Voltage Electrical (Wuxi) Co., Ltd., Xi'an Zhiheng Electrical Technology Co., Ltd. The main drafters of this standard. Chen Tong, Wang Zengyao, Jiao Jianlei, Tang Ying, Liu Yang, Hu Hongyu, Mao Xiang, Chen Peihua. The previous versions of the standard replaced by this standard are as follows. ---GB/T 17045-1997, GB/T 17045-2006, GB/T 17045-2008.
General parts of electric shock protection devices and equipment
1 Scope
This standard is a basic safety publication, mainly used by technical committees in accordance with IEC Guide104 and ISO /IEC Guide51 The principle of writing standards.
This standard is not used as an independent standard.
According to IEC Guide104, technical committees need to use basic safety publications such as IEC 61140 when drafting, revising or revising their publications. This standard applies to electric shock protection for humans and livestock. Its purpose is to give the common electrical installations, systems and equipment, or between them Basic principles and requirements for cooperation. Regarding the voltage or current value or type of current, this standard does not limit, and the frequency is required to not exceed 1000Hz. Some clauses in this standard involve low and high voltage systems, devices and equipment. The rated voltage of the low voltage of this standard does not exceed AC 1000V or 1500V DC. The rated voltage of high voltage exceeds AC 1000V or DC 1500V. It needs to be pointed out that in order to effectively design and select protection measures, it is necessary to consider the possible voltage types and waveforms, that is, AC or DC Voltage, sine, transient, phase control, superimposed DC, and possible hybrids of these waveforms. The device or equipment may affect the voltage wave Shape, such as a converter or frequency converter. The current under normal and fault conditions depends on the above voltage. 2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 13870.1-2008 Effect of electric current on humans and livestock Part 1.General part (IEC TS60479-1.2005, IDT) GB/T 16935.1-2008 Insulation coordination of equipment in low-voltage systems Part 1.Principles, requirements and tests (IEC 60664-1.2007, IDT) GB/T 16895.3-2017 Low-voltage electrical installations Part 5-54 Selection and installation of electrical equipment, grounding configuration and protective conductor (IEC 60364-5-54.2011, IDT) ISO /IEC Guide51.2014 Safety Aspects Standards Including Safety Factors Compilation Guidelines IEC 60038 standard voltage
IEC 60068 (all parts) environmental test
3 Terms and definitions
The following terms and definitions apply to this document.
electric shock
Physiological effects caused by electric current passing through the human body or livestock. Note 1.Physiological effects include perception, muscle contraction and spasm, dyspnea, cardiac dysfunction, stiffness, cardiac arrest, respiratory arrest, burns or other cells damage.
Note 2.This standard does not consider the physiological effects caused by electromagnetic fields. [Source. GB/T 2900.73-2008, 195-01-04, revised---"through the human body or livestock" instead of "human and animal bodies", add Raise 2].
Basic protection
Electric shock protection under fault-free conditions.
[Source. GB/T 2900.73-2008,195-06-01]
Electric shock protection under single fault conditions.
[Source. GB/T 2900.73-2008,195-06-02]
Additional protection
Electric shock protection other than basic protection and/or failure protection. [Source. GB/T 2900.71-2008, 826-12-07, modified---"electric shock protection" replaced "protective measures"]. 3.1.4
Single fault condition
A situation in which a single electric shock protection measure fails or a certain failure causes a dangerous situation. Note. If a single fault condition causes one or more other faults to occur, all fault states are regarded as single fault conditions. 3.2
Electrical circuit
Electric current can flow through the installed device or conductive medium. Note. See GB/T 2900.71-2008,826-14-01 on electrical installations of buildings. 3.3
Electrical Equipment
Equipment used for power generation, transformation, transmission, distribution or utilization of electrical energy, such as motors, transformers, switchgear and control equipment, measuring instruments, Protection devices, wiring systems and electrical equipment.
[Source. GB/T 2900.71-2008,826-16-01]
Live part
Conductors or conductive parts that are charged in normal operation, including neutral conductors and intermediate conductors, but do not include PEN conductors, PEM conductor or PEL conductor.
Note. This concept does not imply a risk of electric shock.
[Source. GB/T 2900.73-2008, 195-02-19, amended---"Including neutral conductor and intermediate conductor" replaced "Including neutral conductor" body"]
Dangerous live parts
Live parts that can cause harmful electric shocks under certain conditions. Note. Dangerous voltage may appear on the surface of high-voltage solid insulation. At this time, the insulating surface is considered a dangerous live part. [Source. GB/T 2900.73-2008,195-06-05]
Exposed conductive parts
The conductive part that can be touched on the equipment is not charged under normal conditions, but charged when the basic insulation is damaged. Note. The conductive parts of electrical equipment can only be charged when contact with the exposed conductive parts of the electric equipment are not regarded as exposed conductive parts. [Source. GB/T 2900.73-2008,195-06-10]
External conductive parts
It is a part of non-electric device, and it is easy to introduce potential conductive part, which is usually local ground potential. [Source. GB/T 2900.73-2008,195-06-11]
Contact voltage
(Effective) contact voltage
People or livestock simultaneously touch the voltage between two conductive parts. Note. The effective contact voltage value may be significantly affected by the impedance of people or livestock that make electrical contact with conductive parts. [Source. GB/T 2900.73-2008, 195-05-11, revised---"human or domestic animal" replaced "human and animal body"] 3.8.2
Expected contact voltage
When people or livestock do not touch the conductive parts, the voltage between these conductive parts that may be reachable at the same time. [Source. GB/T 2900.73-2008, 195-05-09, modified---"human or livestock" replaced "human and animal bodies"] 3.9
Contact current
When a person or livestock touches one or more accessible parts of an electrical device or electrical equipment, the current flows through its body. [Source. GB/T 2900.73-2008, 195-05-21, modified --- "human or domestic animal" replaced "human and animal body"] 3.10
Characterize the various properties of an insulator to achieve its function. Note 1.Related characteristics such as resistance and breakdown voltage. Note 2.Insulation may be solid, liquid, gas (such as air) and combinations thereof. [Source. GB/T 2900.83-2008,151-15-42, modified---"Add Note 2"]
Basic insulation
Insulation on hazardous live parts that can provide basic protection.
Note. This concept does not apply to insulation used only for functional purposes. [Source. GB/T 2900.73-2008,195-06-06]
Additional insulation
In addition to basic insulation, additional separate insulation for fault protection. [Source. GB/T 2900.73-2008,195-06-07]
Double insulation
Insulation consisting of both basic insulation and additional insulation. [Source. GB/T 2900.73-2008,195-06-08]
Reinforced insulation
Dangerous live parts have insulation equivalent to electric shock protection of double insulation. Note. Reinforced insulation can be composed of several layers of insulation that cannot be individually tested as basic insulation or additional insulation. [Source. IEC 60050-195.1998, 195-06-09, modified---provided "grade", deleted] 3.11
Non-conductive environment
When people or livestock touch the exposed conductive parts that are dangerous and live, rely on the high impedance and non-existent connection of the environment (such as insulating walls or floors). The conductive part of the ground is used for protection.
[Source. GB/T 2900.73-2008, 195-06-21, modified---"domestic animals" replaced "animals"] 3.12
(Electrical) protective barrier
Prevent people or livestock from unintentionally contacting the protective material of the live part, but not to prevent intentional direct contact. [Source. GB/T 2900.73-2008, 195-06-16, revised---"contact" replaced "direct contact" and introduced "human or livestock The live part of the touch"]
(Electrical) protective fence
A shield that prevents people or livestock from touching live parts from any direction that is normally accessible. [Source. GB/T 2900.73-2008, 195-06-15, revised---"contact" replaced "direct contact" and introduced "human or livestock The live part of the touch"]
(Electrical) protective enclosure
Protect the electrical enclosure that accesses live parts from any direction and encloses the internal parts of the equipment. Note. In addition, the shell also has a protective effect on internal or external influences, such as the entry of dust or water, or prevent mechanical damage. [Source. GB/T 2900.73-2008, 195-06-14, modified --- "live part" replaced "harmful live part" and added Note]
A person extends from any point on the surface where a person usually stands or moves to the maximum that a person can reach with his hands from any direction without resorting to any means. range.
[Source. GB/T 2900.73-2008,195-06-12]
Equipotential bonding
To equipotentially connect multiple conductive parts electrically.
Note. The effectiveness of equipotential bonding may depend on the frequency of the current in the connection. [Source. GB/T 2900.73-2008, 195-01-10, modified---added note]
Protection of equipotential bonding
Equipotential bonding for safety purposes (such as protection against electric shock). Note. For the definition of functional equipotential bonding, see GB/T 2900.73-2008,195-01-16. [Source. GB/T 2900.73-2008, 195-01-15, modified---introduced "such as protection against electric shock" and added a note] 3.16.2
Equipotential bonding terminal
A terminal used for electrical connection with an equipotential bonding system on a device or device. [Source. GB/T 2900.73-2008,195-02-32]
Protect the connection terminal
Terminals used to protect equipotential bonding.
Protective conductor
For safety purposes, such as a conductor set in protection against electric shock. [Source. GB/T 2900.73-2008,195-02-09]
PE conductor
Protective conductor used to protect ground.
[Source. GB/T 2900.73-2008, 195-02-11, modified---the name of the term] 3.16.6
PEN conductor
Protective earth neutral conductor
A conductor that has the functions of a protective conductor and a neutral conductor. [Source. GB/T 2900.73-2008,195-02-12]
PEM conductor
Protective grounding intermediate conductor
A conductor that has the functions of a protective conductor and an intermediate conductor. [Source. GB/T 2900.73-2008,195-02-13]
PEL conductor
Protective grounding conductor
A conductor with both protective grounding conductor and line conductor functions. [Source. GB/T 2900.73-2008,195-02-14]
Protect bonding conductor
Protective conductor used to protect equipotential bonding.
[Source. GB/T 2900.73-2008,195-02-10]
Wire conductor
Phase conductor (AC system)
Polar conductor (DC system)
A conductor that is live and can be used for power transmission or distribution during normal operation, but is not a neutral conductor or intermediate conductor. [Source. GB/T 2900.73-2008,195-02-08]
Neutral conductor
A conductor that is electrically connected to the neutral point and can be used for power distribution. [Source. GB/T 2900.73-2008,195-02-06]
The concept of earth means the earth and all its natural materials.
Ground (verb)
Make electrical connections between a given point of a system, device or equipment and local ground. Note. The connection with local ground can be.
---Intentional; or
---Unintentional; or accidental
And can be permanent or temporary.
Reference place
The part of the earth that is not affected by any grounding configuration and is regarded as conductive, and its potential is agreed to be zero. [Source. GB/T 2900.73-2008,195-01-01]
The electric potential of the part where the earth is in electrical contact with the ground electrode is not necessarily equal to zero. [Source. GB/T 2900.73-2008,195-01-03]
The conductive part that is buried in a specific conductive medium (such as concrete or coke) and has electrical contact with the ground. [Source. GB/T 2900.73-2008,195-02-01]
Ground conductor
A conductor that provides a conductive path or part of a conductive path between a given point in a system, device, and equipment and the ground electrode. [Source. GB/T 2900.73-2008,195-02-03]
Grounding configuration
All electrical connections and devices included in the grounding of systems, devices and equipment. Note. On the high-voltage side, it may be locally connected gro...

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