Some standard content:
ICS29.120.30
Machinery Industry Standard of the People's Republic of China
JB/T10307-2001
Plug socket-outlets equipment for machine tools2001-10-09Released
China Machinery Industry Federation
2001-12-01Implementation
JB/T10307—2001
1Scope
2Referenced standards
3Terms, symbols, codes
4Classification
5Characteristics
6Normal working conditions and installation conditions
7Structure and performance requirements
8Test
Marking, packaging and storage and transportation
JB/T10307—2001
This standard was formulated mainly with reference to GB/T14048.1 "General principles for low-voltage switchgear and controlgear" and GB14048.5 "Low-voltage switchgear and controlgear control circuit appliances and switch elements Part 1: Electromechanical control circuit appliances". The relevant technical contents such as protection level, contact sequence and protective grounding specified in this standard meet the requirements of GB/T5226.1 "General Technical Conditions for Part 1 of Industrial Machinery Electrical Equipment". The formulation of this standard strives to adopt international standards and foreign advanced national standards equivalently, and combines my country's national conditions. 1. Refer to and partially adopt IEC309-1 "General Requirements for Industrial Plugs and Connectors Part 1". 2. Refer to the German industrial standard DIN43652 "Rectangular Plugs and Connectors with High Density Contacts with Grounding Protection" and the Japanese national industrial standard JIS5433 "Rectangular Plugs and Connectors for Electronic Equipment" to formulate and supplement the relevant provisions. 3. This standard is compatible with the relevant provisions and technical requirements of plugs and sockets for power supply and control circuits. This standard is formulated for the first time.
This standard is proposed and managed by Chengdu Machine Tool Electrical Equipment Research Institute. The drafting unit of this standard: Beijing Third Machine Tool Electrical Equipment Factory. The main drafters of this standard: Sun Tianlu, Li Fenfen, Wang Junping. 1 Scope
Standard of the Machinery Industry of the People's Republic of China
Plug sodket-outlets equipmentformachine toolsJB/T10307—2001
This standard specifies the basic performance and requirements of machine tool plug-in devices (hereinafter referred to as plug sockets), including: terminology, characteristics, normal working and installation conditions, structural and performance requirements, verification of characteristics and performance, etc. This standard applies to plug sockets used for connecting control circuits and power supplies of various machine tool industries with rated voltage AC 50Hz or 60Hz, 660V and below or DC voltage up to 660V, and rated current not exceeding 125A. In addition to machine tools, it also applies to plug sockets used in industrial machinery and equipment such as textile, light industry, tobacco, printing, plastic, rubber and food machinery. This standard applies to plug sockets that meet GB/T5226.1-1996 "Industrial Machinery Electrical Equipment Part 1: General Technical Conditions", that is, with protection level, protective grounding, contact sequence and anti-misinsertion requirements. Plugs and sockets that comply with this standard should not be able to be operated with power on, or should have an electrical interlock device so that the plug and socket can be operated without power on when inserted or removed. Note: If the plug and socket is used as a power cut-off device, this can be negotiated with the manufacturer. 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2900.1—1992
GB/T2900.18—1992
GB/T40261992
GB/T4942.2—1993
GB/T 5169.11—1997
GB/T5226.1——1996
GB/T13384—1992
GB/T14048.1—1993
GB14048.5—1993
3 Terms, symbols and codes
Electrical termsBasic terms
Electrical termsLow-voltage electrical appliances
Identification and application of wiring terminals and special wire ends of electrical equipmentGeneral rules for alphanumeric systemsDegree of protection of low-voltage electrical enclosures
Fire hazard tests for electrical and electronic productsTest methodsGlow-wire tests and conductor tests for finished products Mechanical and electrical equipment Part 1: General technical conditions General technical conditions for packaging of mechanical and electrical products
General provisions for low-voltage switchgear and controlgear
Low-voltage switchgear and controlgear Control circuit appliances and switch elements Part 1: Electromechanical control circuit appliances
The terms, symbols and codes adopted in this standard comply with the provisions of GB/T2900.1 and GB/T2900.18, 4 categories
4.1 Classification by pollution level:
—Pollution level 2:
Approved by China Machinery Industry Federation on October 9, 2001, implemented on December 1, 2001
Pollution level 3.
4.2 Classification by installation category (overvoltage category): Installation category I:
—Installation category II I;
—Installation category III I:
—Installation category IV.
4.3 According to the level of protection against electric shock:
-0 level electrical equipment;
1 level electrical equipment.
4.4 According to the type of structure:
-Plastic shell type;
-Metal shell type:
-Porcelain shell type.
4.5 According to the purpose:
Power supply type:
Signal type, control circuit plug socket.
4.6 According to the appearance:
-Circular;
Rectangular.
4.7 According to the method of use:
Fixed plug and socket;
Coupler.
5 Characteristics
JB/T10307—2001
The characteristics of the plug socket should be specified from the following applicable aspects: 5.1
a) Type of plug socket;
b) Rated value and limit value of plug socket:
c) Coordination with short-circuit protection device (SCPD): d) Overall dimensions and installation dimensions.
5.2 Type of plug socket
5.2.1 Plug socket
The plug socket consists of two parts: the plug and the socket; the plug socket structure is the mutual connection of the pin and the socket or the elastic contact of the contact column. The grounding device adopts the double spring type or the pin and the socket type connected to the shell. The plug socket has a locking mechanism as a whole. Plug (or connector): It is a component installed together with the cable or metal hose and other soft cables connected to the equipment. The plug (or connector) is fastened and sealed with the cable or metal hose through the pipe joint. The socket is a component installed together with the fixed wiring. The socket is connected to a mounting base for installation in the machine tool base cabinet or on the panel. The socket has a protective cover.
5.2.2 Coupler
JB/T10307—2001
The coupler consists of a plug and a connector, which can realize active connection. 5.2.3 Number of poles
4 poles, 5 poles, 6 poles, 7 poles, 8 poles, 10 poles, 16 poles, 20 poles, 24 poles, 32 poles, 36 poles, 40 poles, 48 poles, 64 poles, etc. Note: The number of poles listed is not complete. The manufacturer can specify it in the product standard according to the product situation. 5.2.4 Type of current
—AC:
DC.
5.3 Rated and limit values of plug sockets
The rated and limit values of plug sockets shall be determined in accordance with 5.3.1~5.3.4 of this standard. Specific product standards can be selected as needed. 5.3.1 Rated voltage
5.3.1.1 Rated working voltage
The rated working voltage of the plug socket refers to the voltage value related to the use category. For multi-phase circuits, it refers to the phase-to-phase voltage value. 5.3.1.2 Rated insulation voltage
The rated insulation voltage of the plug socket is the voltage value of the designed plug socket. The electrical clearance and creepage distance shall be determined with reference to this value, unless otherwise specified in the technical conditions of the model product. The rated insulation voltage is the maximum rated working voltage of the plug socket. In any case, the maximum rated working voltage shall not exceed the rated insulation voltage. 5.3.1.3 Rated impulse withstand voltage
Under the specified test conditions, the plug socket can withstand the impulse voltage peak with specified wave and characteristics without failure. The rated impulse withstand voltage is related to the electrical clearance, etc.
The rated impulse withstand voltage of the plug socket should be equal to or greater than the specified value of transient overvoltage that may be generated in the circuit where the plug socket is located. The specified impulse withstand voltage priority value is shown in Table 1. 5.3.2 Current
5.3.2.1 Conventional heating current
The convention heating current of the plug socket is the test current value specified by the manufacturer when the unenclosed plug socket is subjected to temperature rise test in free air. This value is not a rated value and will not be marked on the plug socket in the future. The so-called unenclosed plug socket means that the manufacturer does not provide the shell or the manufacturer provides the shell, but this shell is usually not only the protective shell of the plug socket, but also an integral part of the complete plug socket. 5.3.2.2 Rated current
For the plug socket, the rated current is the current that passes through the pins and sockets for a long time. Unless otherwise specified in the technical documents of the product with the model, the rated current of the plug socket is expressed as 5A, 10A, 16A, 31.5 (32) A40 (35) A, 63A, 125A.
Note: The data in brackets are only for old products. 5.3.3 Rated frequency
Unless otherwise specified in the technical documents of the product with the model, the rated frequency is 50Hz or 60Hz5.3.4 Rated working system
—Eight-hour working system:
Uninterrupted working system.
JB/T10307—2001
5.4 Coordination between the plug socket and the short-circuit protection device (SCPD)5.4.1 The short-circuit protection device of the plug socket adopts a fuse. 5.4.2 The plug socket can withstand the expected short-circuit current value within the fuse time under the test conditions specified in 8.4.7. 5.5 Overall dimensions and installation dimensions
The overall dimensions and installation dimensions of the plug socket shall comply with the provisions of the specific product standards. 6 Normal operating conditions and installation conditions
6.1 Normal operating conditions
The plug socket that complies with this standard shall operate normally under the following specified conditions. Note: If the plug socket is required to operate under conditions exceeding the following specified conditions, the user may negotiate with the manufacturer. 6.1.1 Ambient air temperature
a) The upper limit of the ambient air temperature is +40℃, and its average value within 24 hours does not exceed +35℃; b) The lower limit of the ambient air temperature is -5℃.
Note: The plug socket is expected to be used under the condition of the lower limit of the ambient air temperature of -10℃ or -25℃. When placing an order, the user shall declare it to the manufacturer. The plug socket is expected to be used under the working conditions where the upper limit of the ambient air temperature exceeds +40℃ (such as forging and smelting workshops, boiler rooms, tropical areas) or the lower limit is below -25℃. It should be designed and used according to the relevant product data or the negotiation between the supply and demand parties. 6.1.2 Altitude
The altitude of the installation site shall not exceed 2000m.
6.1.3 Atmospheric conditions
6.1.3.1 Humidity
The relative humidity of the air at the installation site shall not exceed 50% when the maximum temperature is +40℃: higher relative humidity may be allowed at lower temperatures, the monthly average minimum temperature of the wettest month shall not exceed +25℃, and the monthly average maximum relative humidity of that month shall not exceed 90%. Measures must be taken for condensation on the product due to temperature changes. 6.1.3.2 Pollution level
The pollution level is level 2 and level 3.
6.1.3.3 Material group
Material group Ia, Ib.
6.2 Installation conditions
6.2.1 Installation conditions
Normal installation conditions shall be specified in the manufacturer's installation instructions. For plug sockets with specified installation orientation or whose performance is significantly affected by installation conditions, the installation conditions shall be clearly specified in the product standards or technical documents. 6.2.2 Installation category (overvoltage category)
Installation category I, II, IIII, IV.
7 Structural and performance requirements
7.1 Structural requirements
Plug sockets with shells shall be designed to withstand the stresses generated during installation and normal use. In addition, the plug sockets shall be able to resist abnormal heat and fire hazards.
7.1.1 Materials
JB/T10307—2001
The verification test of materials may be carried out in the following appropriate manners: a) on the components of the plug socket;
b) on samples of the same material with an appropriate cross-sectional area. The material of the plug socket should have the corresponding ability to resist abnormal heat and fire hazards. 7.1.1.1 Resistance to abnormal heat and fire hazards
Insulating materials that may be subjected to thermal stress under the action of electricity and may reduce the safety of the electrical appliance should not be adversely affected by abnormal heat and fire. The test method for verifying resistance to abnormal heat and fire hazards is specified in 8.3.1. 7.1.2 Current-carrying parts and their connections
a) Current-carrying parts adopt the elastic connection method of pins and sockets or the elastic contact method of contact posts, and should have the necessary mechanical strength and current-carrying capacity to meet the expected use requirements;
b) Current-carrying parts should be made of copper, copper alloy or other metals with good conductivity and appropriate coatings that meet the actual use requirements; c) Current-carrying parts should ensure sufficient contact pressure and friction to ensure reliable connection. 7.1.3 Electrical clearance and creepage distance
7.1.3.1 Electrical clearance
7.1.3.1.1 Rated impulse withstand voltage
Unless otherwise specified, the rated impulse withstand voltage of the plug socket is recommended to be selected from Table 1. Table 1 lists the corresponding relationship between the installation category, the relative ground voltage determined by the rated voltage of the power supply system and the priority value of the rated impulse withstand voltage in the insulation coordination system with the generally specified overvoltage limit. For a three-phase system that is not grounded or one phase is grounded, the relative phase voltage should be considered as the relative ground voltage. Table 1 Rated impulse withstand voltage value
Determined by the rated voltage of the power supply system
Relax to ground voltage maximum value
(AC effective value or DC)
600 (660)
7.1.3.1.2 Determination of electrical clearance
Rated impulse withstand voltage priority value
(1.2/50μs, 2000m Umm) kV
Installation category (overvoltage category)
The minimum electrical clearance of the plug socket is listed in Table 2. It can be seen from Table 2 that the minimum electrical clearance is related to the rated impulse withstand voltage and the pollution degree. The minimum electrical clearance specified in Table 2 is determined considering an altitude of 2000m, so it is also applicable to the altitude range of 0-2000m. The plug socket should use a minimum electrical clearance greater than the minimum electrical clearance specified in case B in Table 2. If a minimum electrical clearance less than the minimum electrical clearance specified in case A is used, the specified impulse withstand voltage test must be carried out. If the minimum electrical clearance is greater than or equal to the minimum electrical clearance specified in case A, it is not necessary to carry out the impulse withstand voltage test. JB/T10307-2001 The measurement and calculation method of electrical clearance can be found in Appendix A of GB/T14048.1-1993. Table 2 Minimum electrical clearance Minimum electrical clearance Rated impulse withstand voltage (Ump) Or specified impulse withstand voltage Creepage distance Case A Non-uniform electric field conditions Pollution degree Case B Ideal conditions for uniform electric field Pollution degree The minimum creepage distance of the plug socket is related to the rated insulation voltage (or actual working voltage) of the plug socket, the pollution degree and the insulation material group. Unless otherwise specified, the minimum creepage distance for long-term voltage of the plug socket can be selected in Table 3 according to the rated insulation voltage (or actual working voltage), the group of insulating materials and the pollution degree. Table 3 Minimum creepage distance
Rated insulation voltage (or actual working voltage, AC effective value or DC)
630 (690)
Minimum creepage distance of plug socket subjected to long-term voltage mm
Pollution degree 2
Material group
ⅢIa, b
The comparative tracking index of insulating materials directly affects the insulating material group: 6
Pollution degree 3
Material group
Ⅲa, IIb
Material group Ⅲa175≤CTI<400;
Material group IIIb100≤CTI<175bZxz.net
7.1.4 Terminals
7.1.4.1 Requirements for terminal structure
JB/T10307—2001
The structure of the terminal should ensure good electrical contact and the expected current-carrying capacity. All its contact and current-carrying parts should be made of conductive metal and have sufficient mechanical strength.
The terminal should be connected to the conductor (wire) by screw crimping, cold-pressed terminal, welding or other equivalent measures to ensure that the necessary contact pressure is maintained permanently.
The structure of the terminal should be able to compress the wire between appropriate contact surfaces without damaging the wire and the terminal. The structure of the terminal should not allow the (connected) wire to move or their movement should not be harmful to the normal operation of the plug socket or should not cause the insulation voltage to drop below the specified value.
7.1.4.2 Capacity of the terminal to connect wires The type of wire (hard wire or soft wire, single-core wire or multi-strand wire) suitable for the terminal to connect, the maximum and minimum wire cross-section, and the number of wires that can be connected to the terminal at the same time should be specified in the specific product standards. The standard cross-sectional dimensions of round copper conductors are as follows: 0.2mm, 0.3mm, 0.5mm2, 0.75mm2, 1mm, 1.5mm2, 25mm2, 4mm2, 6mm2, 10mm, 16mm, 25mm2, 35mm, 50mm2.
7.1.4.3 Connection of Terminals
Terminals should be easy to access and convenient for wiring when installing and connecting external wires. Screws and nuts that clamp the terminals and wires in place or prevent them from loosening should not be used to fix any other parts. 7.1.4.4 Identification and marking of terminals
The marking of terminals should comply with the provisions of GB/T4026 and should be clearly and permanently identifiable. 7.1.5 Additional requirements for plug sockets with neutral poles When a plug socket has a pole dedicated to connecting the neutral point of the power supply, this pole should be clearly marked with the letter "N". If the neutral pole of the plug socket can be closed and disconnected, the neutral pole should not be disconnected before other current-carrying poles, nor should it be connected after other current-carrying poles.
7.1.6 Provisions for protective grounding
7.1.6.1 Structural requirements
Plug sockets should be equipped with protective grounding devices to ensure that the grounding pole is closed first and then disconnected when closed and disconnected. 7.1.6.2 Protective grounding terminal
The protective grounding terminal should be set in a place that is easy to access and convenient for wiring. The protective grounding terminal should have appropriate anti-corrosion measures, and the minimum size of the grounding screw should not be less than the provisions in Table 9 of GB/T14048.1-1993. 7.1.6.3 Marking and identification of protective grounding terminals Protective grounding should be identified by clear and permanent markings. The power supply protective grounding terminal is marked with PE, and other types of protective grounding terminals are marked with symbols. For details, see the provisions of 5.2 in GB/T5226.1-1996. 7.1.7 Plug and socket housing
7.1.7.1 Housing design
JB/T10307—2001
The housing should be designed so that when the housing is opened and other protective measures are removed, all parts that need to be accessible during installation and maintenance can be easily accessed and convenient to work.
Sufficient space should be left inside the housing to allow external conductors to enter the housing through the entrance hole and ensure that they can be well connected to the wiring terminals. The fixed parts of the metal housing should be connected to the electrical appliance and connected to the grounding terminal so that they can be well grounded or connected to the protective grounding conductor.
The fixed parts of the housing should provide connectable locations and devices to ensure reliable fixed connection. 7.1.7.2 Housing insulation
The metal housing (including the entire plug and socket) must prevent accidental contact with live parts and take into account the necessary electrical clearance and creepage distance. For this purpose, the housing should be fully or partially padded with insulating materials, and these insulating pads should be firmly fixed to the housing. 7.1.7.3 Shell appearance
The shell surface should be flat and smooth, with dense and bright surface coating, without flow hanging layer phenomenon, and the surface should be free of shrinkage holes, flow marks and spots and other defects. 7.1.8 Shell protection level
The shell protection level of the plug socket is generally not less than IP54. According to the installation conditions, a higher protection level may be required, such as adding spray-proof IP65 and above or oil-proof IPY54. The manufacturer can make it according to the company's product conditions. The outer shell of the plug socket should be equipped with a protective cover to prevent foreign objects from entering when the plug and socket are not plugged in and prevent electric shock. 7.1.9 Contact sequence when plugging and unplugging the plug socket
7.1.9.1 When plugging and unplugging with low current level without power a) When plugging, the protective grounding electrode is connected first, and then the neutral electrode and current-carrying electrode are connected; b) When unplugging the plug, the current-carrying electrode and neutral electrode are disconnected first, and then the protective grounding electrode is disconnected. 7.1.9.2 Electrical interlocking device for high current
a) When plugging in, the protective earthing electrode is connected first, then the neutral electrode and the current-carrying electrode are connected, and finally the control electrode is connected: b) When unplugging the plug, the control electrode is disconnected first, then the current-carrying electrode and the neutral electrode are disconnected, and finally the protective earthing electrode is disconnected 7.1.10 Requirements for preventing mis-insertion and non-interchangeability of plug sockets The structure of the plug socket should be able to prevent mis-insertion, and ensure that there is only one fixed plug-in form between the plug sockets, and there should be non-interchangeability measures to achieve the same specification of plug sockets. It is recommended to use different mechanical positioning or mechanical coding to prevent mutual mis-insertion. Note: The specific measures adopted can be clearly specified in the product standard. 7.1.11 Contact resistance
The contact resistance of each pole after the plug is inserted into the socket. The manufacturer of the plug socket can select from the following values: 5m2, 10m2, 15mQ, 20m2, 30m2, 50m2
7.1.12 Pull-out force
When the plug and the socket of the plug socket are fully inserted, each pole should have sufficient contact pressure to ensure reliable contact. However, the contact pressure should not be too large, so as not to affect the smooth insertion and removal of the plug during the overall insertion and removal. The pull-out force is divided into single-pole pull-out force and overall pull-out force. The minimum single-pole pull-out force is shown in Table 4, and the maximum overall pull-out force of different rated current levels is shown in Table 5.
The manufacturer shall select the minimum pull-out force or the maximum overall pull-out force in the specific product standard (or technical conditions) according to the provisions of Table 4 and Table 5. 8
Standard diameter of pin
Rated current
31.5（32）
40（35）
Locking device of plug socket
JB/T10307—2001
Table 4 Minimum single-pole pull-out force
Specimen gauge diameter
5 Maximum overall pull-out force
Minimum single-pole pull-out force
Maximum overall pull-out force
Number of poles × 5
Number of poles × 6
Number of poles × 9
Number of poles × 30
Number of poles × 30
Number of poles × 55
Number of poles × 80
When the plug socket needs to remain connected during normal operation, it should be of the retaining type to prevent disconnection. For power plug sockets that do not meet the breaking capacity and normal operation requirements, they should be designed with electrical interlocking devices. 7.2
Performance requirements
Unless otherwise specified in the relevant product standards, the following performance requirements apply to intact, new plug sockets. 7.2.1 Action performance
The plug socket should be able to ensure that the insertion and removal operations are flexible and reliable, without any stuck phenomenon, and ensure that after the plug is inserted into the socket, all levels should be reliably connected without abnormal phenomena. The number of insertions and removals should use the following recommended values (times): 10, 20, 30, 50. The time interval between each insertion and removal should not exceed 5s. Note: For plug sockets with more poles and larger currents, it should not exceed 10 times. 7.2.2 Temperature rise
The plug socket is subjected to a temperature rise test under specified conditions, and the temperature rise measured for its various components should not exceed the following relevant specified values. 1 Temperature rise of the terminal
The temperature rise of the terminal should not exceed the value specified in Table 6. 93 Connection of Terminals
Terminals should be easy to access and wire when installing and connecting external wires. Screws and nuts that clamp terminals and wires in place or prevent them from loosening should not be used to fix any other parts. 7.1.4.4 Identification and marking of terminals
The marking of terminals should comply with the provisions of GB/T4026 and should be clearly and permanently identifiable. 7.1.5 Additional requirements for plug sockets with neutral poles When a plug socket has a pole dedicated to connecting the neutral point of the power supply, this pole should be clearly marked with the letter "N". If the neutral pole of the plug socket can be closed and disconnected, the neutral pole should not be disconnected before other current-carrying poles, nor should it be connected after other current-carrying poles.
7.1.6 Provisions for protective grounding
7.1.6.1 Structural requirements
Plug sockets should be equipped with protective grounding devices to ensure that the grounding pole is closed first and disconnected later when closing and disconnecting. 7.1.6.2 Protective earthing terminal
The protective earthing terminal shall be located in a place that is easily accessible and convenient for wiring. The protective earthing terminal shall have appropriate anti-corrosion measures, and the minimum size of the grounding screw shall not be less than the provisions in Table 9 of GB/T14048.1-1993. 7.1.6.3 Marking and identification of protective earthing terminals Protective earthing shall be identified by clear and permanent markings. The power supply protective earthing terminal is marked with PE, and other types of protective earthing terminals are marked with symbols. For details, see the provisions of 5.2 in GB/T5226.1-1996. 7.1.7 Plug socket housing
7.1.7.1 Housing design
JB/T10307-2001
The housing shall be designed so that when the housing is opened and other protective measures are removed, all parts that need to be accessed during installation and maintenance can be easily accessible and convenient to work.
Sufficient space should be left inside the shell to allow external conductors to enter the shell from the entrance hole and ensure that they can be well connected to the wiring terminals. The fixed parts of the metal shell should be connected to the electrical appliance and to the grounding terminal so that they can be well grounded or connected to the protective grounding conductor.
The fixed parts of the shell should provide connectable locations and devices to ensure reliable fixed connection. 7.1.7.2 Shell insulation
The metal shell (including the entire plug socket) must be prevented from accidental contact with live parts, and the necessary electrical clearance and creepage distance must be considered. For this purpose, the shell should be fully or partially lined with insulating materials, and these insulating pads should be firmly fixed to the shell. 7.1.7.3 Shell appearance
The shell surface should be flat and smooth, the surface coating should be dense and bright, without flow hanging layer phenomenon, and the surface should be free of shrinkage holes, flow marks and spots and other defects. 7.1.8 Shell protection level
The shell protection level of the plug socket is generally not lower than IP54. Depending on the installation conditions, a higher protection level may be required, such as adding spray-proof IP65 and above or oil-proof IPY54. The manufacturer can formulate it according to the company's product conditions. The outer shell of the plug socket should be equipped with a protective cover to prevent foreign objects from entering when the plug and socket are not plugged in and to prevent electric shock. 7.1.9 Contact sequence when plugging and unplugging the plug socket
7.1.9.1 When plugging and unplugging with low current level without power a) When plugging, the protective earthing electrode is connected first, and then the neutral electrode and current-carrying electrode are connected; b) When unplugging the plug, the current-carrying electrode and neutral electrode are disconnected first, and then the protective earthing electrode is disconnected. 7.1.9.2 Electrical interlocking device for high current
a) When plugging in, the protective earthing electrode is connected first, then the neutral electrode and the current-carrying electrode are connected, and finally the control electrode is connected: b) When unplugging the plug, the control electrode is disconnected first, then the current-carrying electrode and the neutral electrode are disconnected, and finally the protective earthing electrode is disconnected 7.1.10 Requirements for preventing mis-insertion and non-interchangeability of plug sockets The structure of the plug socket should be able to prevent mis-insertion, and ensure that there is only one fixed plug-in form between the plug sockets, and there should be non-interchangeability measures to achieve the same specification of plug sockets. It is recommended to use different mechanical positioning or mechanical coding to prevent mutual mis-insertion. Note: The specific measures adopted can be clearly specified in the product standard. 7.1.11 Contact resistance
The contact resistance of each pole after the plug is inserted into the socket. The manufacturer of the plug socket can select from the following values: 5m2, 10m2, 15mQ, 20m2, 30m2, 50m2
7.1.12 Pull-out force
When the plug and the socket of the plug socket are fully inserted, each pole should have sufficient contact pressure to ensure reliable contact. However, the contact pressure should not be too large, so as not to affect the smooth insertion and removal of the plug during the overall insertion and removal. The pull-out force is divided into single-pole pull-out force and overall pull-out force. The minimum single-pole pull-out force is shown in Table 4, and the maximum overall pull-out force of different rated current levels is shown in Table 5.
The manufacturer shall select the minimum pull-out force or the maximum overall pull-out force in the specific product standard (or technical conditions) according to the provisions of Table 4 and Table 5. 8
Standard diameter of pin
Rated current
31.5（32）
40（35）
Locking device of plug socket
JB/T10307—2001
Table 4 Minimum single-pole pull-out force
Specimen gauge diameter
5 Maximum overall pull-out force
Minimum single-pole pull-out force
Maximum overall pull-out force
Number of poles × 5
Number of poles × 6
Number of poles × 9
Number of poles × 30
Number of poles × 30
Number of poles × 55
Number of poles × 80
When the plug socket needs to remain connected during normal operation, it should be of the retaining type to prevent disconnection. For power plug sockets that do not meet the breaking capacity and normal operation requirements, they should be designed with electrical interlocking devices. 7.2
Performance requirements
Unless otherwise specified in the relevant product standards, the following performance requirements apply to intact, new plug sockets. 7.2.1 Action performance
The plug socket should be able to ensure that the insertion and removal operations are flexible and reliable, without any stuck phenomenon, and ensure that after the plug is inserted into the socket, all levels should be reliably connected without abnormal phenomena. The number of insertions and removals should use the following recommended values (times): 10, 20, 30, 50. The time interval between each insertion and removal should not exceed 5s. Note: For plug sockets with more poles and larger currents, it should not exceed 10 times. 7.2.2 Temperature rise
The plug socket is subjected to a temperature rise test under specified conditions, and the temperature rise measured for its various components should not exceed the following relevant specified values. 1 Temperature rise of the terminal
The temperature rise of the terminal should not exceed the value specified in Table 6. 93 Connection of Terminals
Terminals should be easy to access and wire when installing and connecting external wires. Screws and nuts that clamp terminals and wires in place or prevent them from loosening should not be used to fix any other parts. 7.1.4.4 Identification and marking of terminals
The marking of terminals should comply with the provisions of GB/T4026 and should be clearly and permanently identifiable. 7.1.5 Additional requirements for plug sockets with neutral poles When a plug socket has a pole dedicated to connecting the neutral point of the power supply, this pole should be clearly marked with the letter "N". If the neutral pole of the plug socket can be closed and disconnected, the neutral pole should not be disconnected before other current-carrying poles, nor should it be connected after other current-carrying poles.
7.1.6 Provisions for protective grounding
7.1.6.1 Structural requirements
Plug sockets should be equipped with protective grounding devices to ensure that the grounding pole is closed first and disconnected later when closing and disconnecting. 7.1.6.2 Protective earthing terminal
The protective earthing terminal shall be located in a place that is easily accessible and convenient for wiring. The protective earthing terminal shall have appropriate anti-corrosion measures, and the minimum size of the grounding screw shall not be less than the provisions in Table 9 of GB/T14048.1-1993. 7.1.6.3 Marking and identification of protective earthing terminals Protective earthing shall be identified by clear and permanent markings. The power supply protective earthing terminal is marked with PE, and other types of protective earthing terminals are marked with symbols. For details, see the provisions of 5.2 in GB/T5226.1-1996. 7.1.7 Plug socket housing
7.1.7.1 Housing design
JB/T10307-2001
The housing shall be designed so that when the housing is opened and other protective measures are removed, all parts that need to be accessed during installation and maintenance can be easily accessible and convenient to work.
Sufficient space should be left inside the shell to allow external conductors to enter the shell from the entrance hole and ensure that they can be well connected to the wiring terminals. The fixed parts of the metal shell should be connected to the electrical appliance and to the grounding terminal so that they can be well grounded or connected to the protective grounding conductor.
The fixed parts of the shell should provide connectable locations and devices to ensure reliable fixed connection. 7.1.7.2 Shell insulation
The metal shell (including the entire plug socket) must be prevented from accidental contact with live parts, and the necessary electrical clearance and creepage distance must be considered. For this purpose, the shell should be fully or partially lined with insulating materials, and these insulating pads should be firmly fixed to the shell. 7.1.7.3 Shell appearance
The shell surface should be flat and smooth, the surface coating should be dense and bright, without flow hanging layer phenomenon, and the surface should be free of shrinkage holes, flow marks and spots and other defects. 7.1.8 Shell protection level
The shell protection level of the plug socket is generally not lower than IP54. Depending on the installation conditions, a higher protection level may be required, such as adding spray-proof IP65 and above or oil-proof IPY54. The manufacturer can formulate it according to the company's product conditions. The outer shell of the plug socket should be equipped with a protective cover to prevent foreign objects from entering when the plug and socket are not plugged in and to prevent electric shock. 7.1.9 Contact sequence when plugging and unplugging the plug socket
7.1.9.1 When plugging and unplugging with low current level without power a) When plugging, the protective earthing electrode is connected first, and then the neutral electrode and current-carrying electrode are connected; b) When unplugging the plug, the current-carrying electrode and neutral electrode are disconnected first, and then the protective earthing electrode is disconnected. 7.1.9.2 Electrical interlocking device for high current
a) When plugging in, the protective earthing electrode is connected first, then the neutral electrode and the current-carrying electrode are connected, and finally the control electrode is connected: b) When unplugging the plug, the control electrode is disconnected first, then the current-carrying electrode and the neutral electrode are disconnected, and finally the protective earthing electrode is disconnected 7.1.10 Requirements for preventing mis-insertion and non-interchangeability of plug sockets The structure of the plug socket should be able to prevent mis-insertion, and ensure that there is only one fixed plug-in form between the plug sockets, and there should be non-interchangeability measures to achieve the same specification of plug sockets. It is recommended to use different mechanical positioning or mechanical coding to prevent mutual mis-insertion. Note: The specific measures adopted can be clearly specified in the product standard. 7.1.11 Contact resistance
The contact resistance of each pole after the plug is inserted into the socket. The manufacturer of the plug socket can select from the following values: 5m2, 10m2, 15mQ, 20m2, 30m2, 50m2
7.1.12 Pull-out force
When the plug and the socket of the plug socket are fully inserted, each pole should have sufficient contact pressure to ensure reliable contact. However, the contact pressure should not be too large, so as not to affect the smooth insertion and removal of the plug during the overall insertion and removal. The pull-out force is divided into single-pole pull-out force and overall pull-out force. The minimum single-pole pull-out force is shown in Table 4, and the maximum overall pull-out force of different rated current levels is shown in Table 5.
The manufacturer shall select the minimum pull-out force or the maximum overall pull-out force in the specific product standard (or technical conditions) according to the provisions of Table 4 and Table 5. 8
Standard diameter of pin
Rated current
31.5（32）
40（35）
Locking device of plug socket
JB/T10307—2001
Table 4 Minimum single-pole pull-out force
Specimen gauge diameter
5 Maximum overall pull-out force
Minimum single-pole pull-out force
Maximum overall pull-out force
Number of poles × 5
Number of poles × 6
Number of poles × 9
Number of poles × 30
Number of poles × 30
Number of poles × 55
Number of poles × 80
When the plug socket needs to remain connected during normal operation, it should be of the retaining type to prevent disconnection. For power plug sockets that do not meet the breaking capacity and normal operation requirements, they should be designed with electrical interlocking devices. 7.2
Performance requirements
Unless otherwise specified in the relevant product standards, the following performance requirements apply to intact, new plug sockets. 7.2.1 Action performance
The plug socket should be able to ensure that the insertion and removal operations are flexible and reliable, without any stuck phenomenon, and ensure that after the plug is inserted into the socket, all levels should be reliably connected without abnormal phenomena. The number of insertions and removals should use the following recommended values (times): 10, 20, 30, 50. The time interval between each insertion and removal should not exceed 5s. Note: For plug sockets with more poles and larger currents, it should not exceed 10 times. 7.2.2 Temperature rise
The plug socket is subjected to a temperature rise test under specified conditions, and the temperature rise measured for its various components should not exceed the following relevant specified values. 1 Temperature rise of the terminal
The temperature rise of the terminal should not exceed the value specified in Table 6. 93 Shell appearance
The shell surface should be flat and smooth, with dense and bright surface coating, without flow hanging layer phenomenon, and the surface should be free of shrinkage holes, flow marks and spots and other defects. 7.1.8 Shell protection level
The shell protection level of the plug socket is generally not less than IP54. According to the installation conditions, a higher protection level may be required, such as adding spray-proof IP65 and above or oil-proof IPY54. The manufacturer can make it according to the company's product conditions. The outer shell of the plug socket should be equipped with a protective cover to prevent foreign objects from entering when the plug and socket are not plugged in and prevent electric shock. 7.1.9 Contact sequence when plugging and unplugging the plug socket
7.1.9.1 When plugging and unplugging with low current level without power a) When plugging, the protective grounding electrode is connected first, and then the neutral electrode and current-carrying electrode are connected; b) When unplugging the plug, the current-carrying electrode and neutral electrode are disconnected first, and then the protective grounding electrode is disconnected. 7.1.9.2 Electrical interlocking device for high current
a) When plugging in, the protective earthing electrode is connected first, then the neutral electrode and the current-carrying electrode are connected, and finally the control electrode is connected: b) When unplugging the plug, the control electrode is disconnected first, then the current-carrying electrode and the neutral electrode are disconnected, and finally the protective earthing electrode is disconnected 7.1.10 Requirements for preventing mis-insertion and non-interchangeability of plug sockets The structure of the plug socket should be able to prevent mis-insertion, and ensure that there is only one fixed plug-in form between the plug sockets, and there should be non-interchangeability measures to achieve the same specification of plug sockets. It is recommended to use different mechanical positioning or mechanical coding to prevent mutual mis-insertion. Note: The specific measures adopted can be clearly specified in the product standard. 7.1.11 Contact resistance
The contact resistance of each pole after the plug is inserted into the socket. The manufacturer of the plug socket can select from the following values: 5m2, 10m2, 15mQ, 20m2, 30m2, 50m2
7.1.12 Pull-out force
When the plug and the socket of the plug socket are fully inserted, each pole should have sufficient contact pressure to ensure reliable contact. However, the contact pressure should not be too large, so as not to affect the smooth insertion and removal of the plug during the overall insertion and removal. The pull-out force is divided into single-pole pull-out force and overall pull-out force. The minimum single-pole pull-out force is shown in Table 4, and the maximum overall pull-out force of different rated current levels is shown in Table 5.
The manufacturer shall select the minimum pull-out force or the maximum overall pull-out force in the specific product standard (or technical conditions) according to the provisions of Table 4 and Table 5. 8
Standard diameter of pin
Rated current
31.5（32）
40（35）
Locking device of plug socket
JB/T10307—2001
Table 4 Minimum single-pole pull-out force
Specimen gauge diameter
5 Maximum overall pull-out force
Minimum single-pole pull-out force
Maximum overall pull-out force
Number of poles × 5
Number of poles × 6
Number of poles × 9
Number of poles × 30
Number of poles × 30
Number of poles × 55
Number of poles × 80
When the plug socket needs to remain connected during normal operation, it should be of the retaining type to prevent disconnection. For power plug sockets that do not meet the breaking capacity and normal operation requirements, they should be designed with electrical interlocking devices. 7.2
Performance requirements
Unless otherwise specified in the relevant product standards, the following performance requirements apply to intact, new plug sockets. 7.2.1 Action performance
The plug socket should be able to ensure that the insertion and removal operations are flexible and reliable, without any stuck phenomenon, and ensure that after the plug is inserted into the socket, all levels should be reliably connected without abnormal phenomena. The number of insertions and removals should use the following recommended values (times): 10, 20, 30, 50. The time interval between each insertion and removal should not exceed 5s. Note: For plug sockets with more poles and larger currents, it should not exceed 10 times. 7.2.2 Temperature rise
The plug socket is subjected to a temperature rise test under specified conditions, and the temperature rise measured for its various components should not exceed the following relevant specified values. 1 Temperature rise of the terminal
The temperature rise of the terminal should not exceed the value specified in Table 6. 93 Shell appearance
The shell surface should be flat and smooth, with dense and bright surface coating, without flow hanging layer phenomenon, and the surface should be free of shrinkage holes, flow marks and spots and other defects. 7.1.8 Shell protection level
The shell protection level of the plug socket is generally not less than IP54. According to the installation conditions, a higher protection level may be required, such as adding spray-proof IP65 and above or oil-proof IPY54. The manufacturer can make it according to the company's product conditions. The outer shell of the plug socket should be equipped with a protective cover to prevent foreign objects from entering when the plug and socket are not plugged in and prevent electric shock. 7.1.9 Contact sequence when plugging and unplugging the plug socket
7.1.9.1 When plugging and unplugging with low current level without power a) When plugging, the protective grounding electrode is connected first, and then the neutral electrode and current-carrying electrode are connected; b) When unplugging the plug, the current-carrying electrode and neutral electrode are disconnected first, and then the protective grounding electrode is disconnected. 7.1.9.2 Electrical interlocking device for high current
a) When plugging in, the protective earthing electrode is connected first, then the neutral electrode and the current-carrying electrode are connected, and finally the control electrode is connected: b) When unplugging the plug, the control electrode is disconnected first, then the current-carrying electrode and the neutral electrode are disconnected, and finally the protective earthing electrode is disconnected 7.1.10 Requirements for preventing mis-insertion and non-interchangeability of plug sockets The structure of the plug socket should be able to prevent mis-insertion, and ensure that there is only one fixed plug-in form between the plug sockets, and there should be non-interchangeability measures to achieve the same specification of plug sockets. It is recommended to use different mechanical positioning or mechanical coding to prevent mutual mis-insertion. Note: The specific measures adopted can be clearly specified in the product standard. 7.1.11 Contact resistance
The contact resistance of each pole after the plug is inserted into the socket. The manufacturer of the plug socket can select from the following values: 5m2, 10m2, 15mQ, 20m2, 30m2, 50m2
7.1.12 Pull-out force
When the plug and the socket of the plug socket are fully inserted, each pole should have sufficient contact pressure to ensure reliable contact. However, the contact pressure should not be too large, so as not to affect the smooth insertion and removal of the plug during the overall insertion and removal. The pull-out force is divided into single-pole pull-out force and overall pull-out force. The minimum single-pole pull-out force is shown in Table 4, and the maximum overall pull-out force of different rated current levels is shown in Table 5.
The manufacturer shall select the minimum pull-out force or the maximum overall pull-out force in the specific product standard (or technical conditions) according to the provisions of Table 4 and Table 5. 8
Standard diameter of pin
Rated current
31.5（32）
40（35）
Locking device of plug socket
JB/T10307—2001
Table 4 Minimum single-pole pull-out force
Specimen gauge diameter
5 Maximum overall pull-out force
Minimum single-pole pull-out force
Maximum overall pull-out force
Number of poles × 5
Number of poles × 6
Number of poles × 9
Number of poles × 30
Number of poles × 30
Number of poles × 55
Number of poles × 80
When the plug socket needs to remain connected during normal operation, it should be of the retaining type to prevent disconnection. For power plug sockets that do not meet the breaking capacity and normal operation requirements, they should be designed with electrical interlocking devices. 7.2
Performance requirements
Unless otherwise specified in the relevant product standards, the following performance requirements apply to intact, new plug sockets. 7.2.1 Action performance
The plug socket should be able to ensure that the insertion and removal operations are flexible and reliable, without any stuck phenomenon, and ensure that after the plug is inserted into the socket, all levels should be reliably connected without abnormal phenomena. The number of insertions and removals should use the following recommended values (times): 10, 20, 30, 50. The time interval between each insertion and removal should not exceed 5s. Note: For plug sockets with more poles and larger currents, it should not exceed 10 times. 7.2.2 Temperature rise
The plug socket is subjected to a temperature rise test under specified conditions, and the temperature rise measured for its various components should not exceed the following relevant specified values. 1 Temperature rise of the terminal
The temperature rise of the terminal should not exceed the value specified in Table 6. 9
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