GB 39752-2024 PDF English
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Safety requirements of electric vehicle conductive supply equipment
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Safety requirements and test specifications of electric vehicle conductive supply equipment
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GB 39752-2024: PDF in English GB 39752-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.99
CCS T 35
Replacing GB/T 39752-2021
Safety requirements of electric vehicle conductive supply
equipment
ISSUED ON. JULY 24, 2024
IMPLEMENTED ON. AUGUST 01, 2025
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 9
4 Symbols and abbreviations... 16
5 Safety element requirements... 17
6 General test rules... 31
7 Test methods... 34
8 Implementation of the standard... 42
Appendix A (Normative) Installation of EV energy transfer equipment... 43
References... 45
Safety requirements of electric vehicle conductive supply
equipment
1 Scope
This document specifies the safety element requirements of EV energy transfer
equipment (hereinafter referred to as "power supply equipment"), establishes test
general rules, describes the corresponding test methods.
Note. For independent electrical accessories and auxiliary materials (such as connecting devices,
cables, insulating materials, etc.) of power supply equipment, they must be used in combination
with this document according to specific product standards.
This document is applicable to various types of power supply equipment, which has a
rated output voltage of 1000 V AC or 1500 V DC and below, including power supply
equipment in mode 2, mode 3, mode 4.
This document does not cover the following.
- Functional and performance requirements of power supply equipment not related
to safety;
- Information security requirements;
- Safety requirements related to transport packaging and improper use;
- Safety requirements caused by deliberate destruction and other purposeful
behaviors;
- Safety requirements for power supply equipment with discharge function;
- Safety requirements for power supply equipment with automatic charging and top
contact charging.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
GB/T 2423.1 Environmental testing for electric and electronic and electronic
5.2.2 Handles and manual control devices
Handles, knobs, clamps, joysticks and other similar moving parts shall be firmly
installed and shall not be loose under normal use.
5.2.3 Connections and splicing
All connections and splicing of power supply equipment shall be mechanically firm and
electrically continuous, to avoid mechanical damage. All wires used for external
connections, connections between parts and internal connections of parts, conductors
in contact with each other or exposed live parts shall have insulation protection or
insulation distances that meet the highest working voltage.
Screws, nuts, washers, springs or similar parts shall be fully fixed and able to withstand
the mechanical stress generated by normal use, to prevent safety hazards caused by
loosening that cross the electrical gap and creepage distance of additional insulation or
reinforced insulation.
When the input power wire is permanently connected, the terminal shall be fixed by
screws, nuts or other equivalent devices.
The busbars (bare or insulated) shall be arranged so that they will not have internal short
circuits and can withstand the short-circuit stress limited by the protective device.
The connection between current-carrying parts shall ensure sufficient and lasting
contact pressure. The insulated hard or soft wires used shall.
- Be determined at least according to the rated insulation voltage of the relevant
circuit;
- Not have intermediate joints between the wires connecting the two terminals, such
as twisting or welding.
When multi-strand stranded wires are fixed to the terminal, there shall be no danger of
accidental contact between the wires and the following parts.
- Other uninsulated live parts with different potential from the wires;
- Non-live metal parts.
The connection devices, plugs, sockets used shall not cause danger due to
misconnection. When using tools to disassemble the connection device, there shall be
no electric shock or energy hazards during and after the removal of the conductor parts.
All internal parts used for electrical connections shall meet the matching current-
carrying capacity; their maximum temperature under rated working conditions shall not
exceed the tolerance temperature of the surrounding materials used.
5.2.4 Wiring
The holes inside or outside the power supply equipment for insulated cables to pass
through shall have smooth surfaces or smooth sleeves or grommets to reduce the wear
of the cable insulation layer. The wiring path shall avoid sharp edges, threads, burrs,
wings, moving parts and similar parts that may damage the insulation layer.
The edges of the clamps and conduits used for wiring shall be smooth and rounded. The
joints and supporting surfaces of the clamps shall not cause insulation wear.
5.2.5 Enclosure openings
The configuration and construction of the openings shall ensure that foreign objects
entering the openings will not contact the exposed live parts and cause danger. Openings
in door panels, panels, covers, etc. shall meet the protection requirements of IPXXC
when closed or in place. Power supply equipment intended for use in more than one
direction is applicable to each direction.
Cable protection measures shall be taken for the openings used for the inlet and outlet
of the power supply equipment, to prevent sharp edges from scratching the cables.
5.2.6 Protection level
The protection level of the power supply equipment's enclosure for outdoor use shall
not be less than IP54; the protection level of the power supply equipment's enclosure
for indoor use shall not be less than IP32.The protection level of the functional box
components of the power supply equipment in mode 2 shall not be less than IP55,
meanwhile it shall comply with the provisions of 8.5.3 in GB/T 41589-2022.
5.3 Electric shock protection
5.3.1 Decisive voltage level limit (DVC)
The electric shock protection measures depend on the decisive voltage level of the
circuit. The decisive voltage level of the circuit depends on the operating voltage limit
of the circuit and the insulation measures adopted. Circuits that meet DVC level A are
touchable. Circuits that meet DVC level B and DVC level C are not touchable. Under
normal working conditions, the limit of DVC of the power supply equipment is
determined according to Table 2.
equipment or components are used as specified;
- Through a special protective bonding conductor;
- Through other metal components of the power supply equipment.
The protective bonding shall remain effective when a fault occurs in the accessible
conductive parts, unless the superior protection device cuts off the power supply of
the part.
b) Protective grounding
The protective grounding conductor in the power supply equipment shall be marked
and clearly identifiable; the minimum cross-sectional area of the protective
grounding conductor shall comply with the requirements for protective grounding
conductors in GB/T 18487.1.
The metal enclosure, partition, metal enclosure of electrical components and metal
handles without double insulation or reinforced insulation protection, which are
used as isolation of live conductors, shall be effectively grounded; the continuity
resistance shall not be greater than 0.1 Ω.
The external protective grounding conductor of the power supply equipment shall
provide a connection method close to the corresponding live conductor connection
terminal; this connection method shall be corrosion-resistant. After the power supply
equipment is powered on, its external protective grounding conductor shall always
remain connected.
If the external protective earth conductor passes through the plug and socket or
similar disconnect device, these connections shall not be disconnected, unless the
power supply of the protected part can also be disconnected at the same time.
In the case of damaged or disconnected protective earth conductor, the contact
current of the power supply equipment enclosure shall comply with the requirements
of 12.1 of GB/T 18487.1-2023.
The protective conductor of each charging cable in the power supply equipment with
multiple vehicle plugs shall be connected to a common protective earth conductor.
5.3.3 Residual current protection
5.3.3.1 Residual current protection of AC power supply equipment
AC power supply equipment shall be equipped with an independent residual current
protector (device) at each charging port, which shall comply with the relevant residual
current action characteristics requirements of GB/T 14048.2, or GB/T 16916.1 and
GB/T 22794, or GB/T 16917.1 and GB/T 22794.AC power supply equipment shall
have one of the following protection measures.
a) A-type residual current protector (device) with 6 mA and above smooth DC
residual current protection;
b) A-type residual current protector (device) and 6 mA and above smooth DC
residual current monitoring protection device used in combination;
c) B-type residual current protector (device), which is configured when the current
power supply circuit is configured with a residual current protector (device) not
lower than type B or when no residual current protector (device) is installed.
The rated residual operating current IΔn of the residual current protector (device) shall
not exceed 30 mA.
Note. The residual current protector (device) is installed inside the power supply equipment, or
installed on the power supply circuit of the power supply equipment, meanwhile corresponds
to the power supply interface one by one.
5.3.3.2 Residual current protection of DC power supply equipment
The AC side main circuit of DC power supply equipment shall have the residual current
protection function that meets the requirements of 5.3.3.1 or have one of the following
enhanced electrical protection measures.
a) Double insulation;
b) Enhanced insulation;
c) Isolation;
d) Double insulation or enhanced insulation or the DC power supply equipment
enclosure adopts basic insulation and the accessible conductive parts are reliably
grounded; meanwhile when its enclosure is deformed, the basic insulation shall
not be damaged.
Among them, isolation can be achieved by installing fences on the outside of the
equipment and isolation nets on the inside.
When the control power supply AC circuit of the DC power supply equipment does not
have the residual current protection function on the power supply network side, it shall
have a residual current protector (device) (AC type residual current protector can be
used), meanwhile its rated residual operating current IΔn shall not exceed 30 mA.
For DC power supply equipment with a rated maximum power of not more than 20 kW,
when the residual current protector (device) that meets the requirements of 5.3.3.1 has
been installed on the power supply network side, the AC power supply circuit may not
be equipped with a residual current protector (device).
b) Overvoltage category
- Power supply equipment parts (power supply part) directly connected to the AC
power supply network. Minimum overvoltage category IV;
- Power supply equipment parts (power supply part) directly connected to the DC
power supply network. Minimum overvoltage category II;
- Power supply equipment permanently connected to the AC power supply network.
Minimum overvoltage category III; however, for power supply sockets or vehicle
plugs with connection method C. Minimum overvoltage category II;
- Power supply equipment connected to the power supply network through standard
plug cable assemblies or vehicle sockets. Minimum overvoltage category II.
5.3.6 Contact current
The contact current of the power supply equipment shall comply with the requirements
of 12.1 of GB/T 18487.1-2023.
5.3.7 Insulation resistance
The insulation resistance between each non-electrically connected live circuit of the
power supply equipment and between each independent live circuit and the ground
(enclosure) shall not be less than 10 MΩ.
The insulation resistance, within 30 minutes after the end of the alternating damp heat
test Db of GB/T 2423.4, shall meet the following requirements.
- Class I equipment. R > 1 MΩ;
- Class II equipment. R > 7 MΩ.
5.3.8 Dielectric strength
5.3.8.1 Power frequency withstand voltage
The working voltage -- between the non-electrically connected live circuits of the power
supply equipment and between each independent live circuit and the ground (metal
enclosure) -- shall be able to withstand the power frequency AC voltage specified in
Table 4 for 1 minute (DC voltage can also be used, the test voltage is 1.4 times the
effective value of the AC voltage).
2024.
DC power supply equipment shall comply with the requirements of 8.2.8 in GB 44263-
2024.
5.4.3 Short circuit protection
AC power supply equipment shall comply with the requirements of 7.1.6 in GB 44263-
2024.
DC power supply equipment shall comply with the requirements of 8.1.2 in GB 44263-
2024.
Each output circuit of the power supply equipment of multiple vehicle plugs shall have
a short circuit protection function. The short circuit protection of the charging cable
shall comply with the requirements of 13.3 and C.7.10 in GB/T 18487.1-2023.
5.4.4 Overtemperature protection
AC power supply equipment shall comply with the requirements of 6.2.1 in GB 44263-
2024.
DC power supply equipment shall comply with the requirements of 6.2.2 in GB 44263-
2024.
5.4.5 Load dump protection
DC power supply equipment shall comply with the requirements of 8.2.9 in GB 44263-
2024.
5.4.6 Anti-backflow function
DC power supply equipment shall have anti-backflow function (such as adding diodes
to the output, etc.), to prevent the battery current from flowing back.
Note. Power supply equipment with discharge function is not applicable.
5.4.7 Adhesion protection
AC power supply equipment shall comply with the requirements of 7.1.5 in GB 44263-
2024.
DC power supply equipment shall comply with the requirements of 8.1.7 in GB 44263-
2024.
DC power supply equipment with multiple vehicle plugs shall have the power
distribution switching circuit adhesion detection and alarm function.
5.4.8 Access protection
When the power supply equipment door is opened to expose the live parts and does not
meet the IPXXB protection requirements, it shall have access protection function; the
voltage of the exposed live parts of the power supply equipment shall meet DVC level
A within 1 s.
5.4.9 Insulation protection
DC power supply equipment shall comply with the requirements of 8.1.5 in GB 44263-
2024.
5.4.10 Switching requirements for modules of DC power supply equipment with
multiple vehicle plugs
When the charging module of the DC power supply equipment with multiple vehicle
plugs is switched between charging vehicle interfaces, the charging module output shall
be turned off first, meanwhile the output voltage shall be discharged before being put
into other charging interfaces.
5.5 Overheating and fire
5.5.1 Hazard identification
When the power supply equipment is working normally, it shall prevent overheating
caused by the following situations, to avoid degradation of electrical, mechanical,
insulation or other performance, resulting in danger.
- The accessible parts exceed the safe temperature.
- Components, parts, insulation, plastic materials exceed the specific temperature.
- The structure and installation surface exceed the specific temperature.
5.5.2 Allowable surface temperature
The surface temperature of the EV energy transfer equipment shall not exceed the
allowable temperature during operation.
Under the conditions of maximum charging current and ambient temperature of 40 °C,
the maximum allowable temperature of the surface that can be touched by hand is.
a) 50 °C for metal parts;
b) 60 °C for non-metal parts.
Under the same working conditions, the maximum allowable temperature of the surface
that the user may touch but cannot hold is.
a) 60 °C for metal parts;
b) 85 °C for non-metal parts.
Under the same working conditions, the maximum surface temperature of the charging
cable shall not exceed 77 °C. When the surface temperature of the charging cable
exceeds 60 °C, a high temperature warning sign shall be added.
5.5.3 Ignition and flame spread
Under normal working conditions and single fault conditions, the power supply
equipment shall use appropriate materials and structures, such as flame-retardant
materials, insulation or sufficient barriers to limit the maximum temperature of
components or limit the effective power of the circuit, to avoid ignition and flame
spread.
5.6 Mechanical protection
5.6.1 Moving parts
The moving parts of the power supply equipment shall be reasonably arranged, or
installed in a closed manner, or equipped with protective covers, to prevent the danger
of unintentional contact during operation and maintenance. The moving parts shall not
crush, cut, or puncture the body parts of the operator in contact with them, nor shall
they seriously scratch the operator's skin. If the protective cover of the moving part is
removable, a warning sign shall be applied.
5.6.2 Mechanical strength
The power supply equipment shall have sufficient mechanical strength, to withstand the
stress applied to it during normal use.
Mode 2.The vehicle crushing resistance of IC-CPD shall meet the requirements of 8.1
in GB/T 41589-2022.The mechanical impact and mechanical collision resistance of
IC-CPD shall meet the requirements of 8.11 in GB/T 41589-2022.The vibration and
impact resistance of IC-CPD shall meet the requirements of 8.25 in GB/T 41589-2022.
Mode 3 and Mode 4.The mechanical strength of the metal enclosure of the power
supply equipment shall not be less than IK10 specified in GB/T 20138; the mechanical
strength of the non-metal enclosure shall not be less than IK08 specified in GB/T 20138,
except for the LCD screen, membrane buttons, decorative panels, indicator lights, locks
and other parts.
5.7 Electromagnetic compatibility
5.7.1 Immunity requirements
The immunity test categories and levels of power supply equipment shall comply with
the requirements of GB/T 18487.2.
5.7.2 Emission requirements
The conducted disturbance limits of the power input port, CPT port, signal/control port,
the radiated disturbance limits of the enclosure port, the harmonic current, voltage
fluctuation and flicker of the power input port of the power supply equipment shall
comply with the requirements of GB/T 18487.2.
5.8 Identification and indication
5.8.1 Identification
5.8.1.1 General requirements
The power supply equipment shall be marked with product identification and warning
signs as required.
The identification of the power supply equipment shall remain clearly identifiable under
normal use conditions and be corrosion-resistant.
5.8.1.2 Product identification
The content of the product identification of the power supply equipment shall comply
with the requirements of Chapter 17 of GB/T 18487.1-2023.The product identification
shall be directly visible from the outside after the power supply equipment is properly
installed, or directly visible behind a cover or door that the operator can open without
tools. Product identification shall not be applied to parts that can be removed by
operators without tools. For rack or panel embedded power supply equipment, it is
allowed to see the identification after it is removed from the rack or panel.
5.8.1.3 Warning signs
Warning signs shall be set on the surface of the power supply equipment or any door,
cover or other protective measures leading to dangerous parts. Warning signs shall
comply with the sign type, color, material, size, use requirements specified in GB 2894.
If the warning sign is for a specific part of the equipment, it shall be marked on the part
or in a nearby position.
5.8.2 Indication
The power supply equipment shall be able to provide one or both of the following
indications.
- An integrated indication that can be directly visible or audible;
- An electrical or electronic indication that can be accessed and used remotely, such
as a signal relay contact, open collector output or information transmission through
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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