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GB 39752-2024: Safety requirements of electric vehicle conductive supply equipment
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 elect...