Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T 8755-1998
Mobile residual current protector
1998-05-26 Issued
Ministry of Machinery Industry of the People's Republic of China
1998-12-01 Implementation
JB/T8755-1998
This standard conforms to the relevant requirements of national standards such as GB6829-1995 "General requirements for residual current operated protectors", GB16916.1--1997 "Residual current operated circuit breakers without overcurrent protection for household and similar purposes Part 1: General rules", GB1002-1996 "Types, basic parameters and dimensions of single-phase plugs and sockets for household and similar purposes" and GB2099.1-1996 "Plugs and sockets for household and similar purposes Part 1: General requirements".
my country has been producing mobile residual current protective devices for many years, but there is no complete product standard so far, which brings certain difficulties to the assessment and certification of products. Through the formulation of this standard, mobile residual current protective devices have a unified industry standard, which provides a unified assessment basis for product certification and quality inspection to meet the needs of foreign trade, technology and economic exchanges. This standard will be implemented from December 1, 1998. This standard is proposed and managed by the National Technical Committee for Standardization of Low Voltage Electrical Appliances. The drafting unit of this standard: Shanghai Electric Science Research Institute. The main drafters of this standard: Zhou Jigang and Sun Zhu. 1 Scope
Machinery Industry Standard of the People's Republic of China
Mobile Residual Current Protector
JB/T8755-1998
This standard specifies the electrical and mechanical performance requirements and corresponding test methods, as well as inspection rules and marking requirements of mobile residual current protectors (or PRCDs) for household and similar purposes [hereinafter referred to as "mobile residual current protectors (or PRCDs)". The PRCD specified in this standard consists of a plug, a residual current operated protector and one or more sockets or wiring devices. The PRCD specified in this standard does not have overcurrent protection and is suitable for single-phase circuits with a rated voltage not exceeding 250V and a rated current not exceeding 16A. It is used to protect against electric shock hazards, and its rated residual operating current does not exceed 30mA. The PRCD applicable to this standard should also have the function of detecting residual current. The function of comparing the residual current value with the residual operating current value and the function of disconnecting the protected circuit when the residual current exceeds the residual operating current value. PRCDs that comply with this standard are suitable for normal environmental conditions. PRCDs used under more severe environmental conditions should have additional technical requirements.
PRCDs with overcurrent protection and fixed residual current protection sockets can refer to the relevant clauses of this standard and should comply with other relevant standards (for example: GB10963-89 "Circuit breakers for household and similar places", GB2099.1-1996 "Household and similar plugs and sockets Part 1: General requirements" and other standards). 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, all versions are valid. All standards All parties using this standard should explore the possibility of using the latest version of the following standards. GB1002-1996
GB2099.1—1996
GB/T2423.4---1993
GB4208—1993
GB/T4207—1984
GB/T5169.4—1985
GB6829—1995
GB16916.1—1997
3 Terms and symbols
3.1 Terms
Single-phase plugs and sockets for household and similar purposes Types, basic parameters and dimensions Plugs and sockets for household and similar purposes Part 1: General requirements (cqvTEC884-1:1994) Basic environmental test procedures for electric and electronic products Test Db: Alternating damp heat test method (eqvIEC68--2-30: 1980)
Enclosure protection degree (IP code) (cqvIEC529: 1989) Determination method of comparative tracking index of solid insulating materials under humid conditions (neqIEC112: 1979)
Fire hazard test for electric and electronic products Glow-wire test method and guidance (eqvIEC695-2-11980)
General requirements for residual current operated protective devices (eqvIEC755: 1983) Residual current operated circuit breakers without overcurrent protection for household and similar purposes (RCCB) Part 1: General rules (ictIEC10081: 1990) Unless otherwise specified, where "voltage" and "current" values are specified, they refer to their root mean square values (rms). Approved by the Ministry of Machinery Industry on May 26, 1998
Implemented on December 1, 1998
JB/T8755-1998
The term "grounding" used in this standard refers to protective grounding. The term "electrical accessory" is a general term, including plugs and sockets, while "mobile electrical accessories" include plugs and mobile sockets. In addition to the terms specified in the referenced standards, this standard supplements the following terms. 3.1.1 Plug
Refers to an electrical accessory with a pin designed to be plugged into the socket of a socket and equipped with components for electrical connection and mechanical positioning with a flexible cable. [3.1 in GB2099.1-1996] 3.1.2 Socket-outlet
Refers to an electrical accessory with a socket designed to be plugged into the pin of a plug and equipped with terminals for connecting a flexible cable. [3.2 in GB2099.1-1996]
3.1.3 Portable socket-outlet refers to a socket intended to be connected to a flexible cable or to be integral with a flexible cable and which can be easily moved from one place to another when connected to a power source. [3.4 in GB2099.1-1996]
3.1.4 Multiple socket-outlet refers to a combination of two or more sockets. [3.5 in GB2099.1-1996]3.1.5 Rewirable plug or rewirable portable socket-outlet refers to an electrical accessory that is structurally capable of replacing a flexible cable. [3.7 in GB2099.1-1996] 3.1.6 Non-rewirable plug or non-rewirable portable socket-outlet
refers to an electrical accessory that is structurally integrated with a flexible cable after being connected and assembled at the electrical accessory manufacturer. [3.8 in GB2099.1-1996]
3.1.7 Moulded accessory refers to a non-rewirable electrical accessory in which pre-assembled parts and the end of the flexible cable are pressed together with insulating materials using a mold. [3.9 in GB2099.1-1996]
3.1.8 Cord extension set refers to an assembly consisting of a flexible cable with a non-rewirable plug at one end and a non-rewirable portable socket at the other end. [3.12 in GB2099.1-1996]
3.1.9Terminal
refers to a reusable, insulated or uninsulated connecting device used for electrical connection of external conductors. [3.131 in GB2099.1-1996
3.1.10Termination
refers to a non-reusable, insulated or uninsulated connecting device used for electrical connection of external conductors. [3.14 in GB2099.1-1996
3.1.11Clamping unit
refers to a component in a terminal that is necessary for mechanical clamping and electrical connection of the conductor. [3.15 in GB2099.1-1996] 3.1.12 Screw-type terminal Screw-type terminal is used to connect a conductor and then remove the conductor, or to connect two or more detachable conductors to each other. The connection is directly or indirectly completed with various screws or nuts. [3.6.2 in GB16916.11997] 3.1.13 Pillar terminal The wire is inserted into a hole or cavity, and the end of the screw is used to press the wire into the screw-type terminal. The tightening pressure can be applied directly by the end of the screw or through a transition element that applies pressure from the end of the screw. [3.6.3 in GB16916.1-1997] 3.1.14 Screw terminal The wire is tightened under the screw head. The tightening pressure can be applied directly by the screw head or through a transition element, such as a washer, a clamp or a loosening prevention device. 2
[3.6.4 in GB16916.1-1997]
3.1.15 Stud terminal The wire is tightened under the nut. JB/T8755-1998
The tightening pressure can be applied directly by a nut of appropriate shape or through a transition part, such as a washer, a clamp or a loosening prevention device. [3.6.5 in GB16916.1-1997] 3.1.16 Saddle terminal Saddleterminal The wire is fastened to the threaded terminal under the saddle plate by two or more screws or nuts. [13.6.6 in GB16916.1-1997] 3.1.17 Mantleterminal The wire is fastened to the threaded terminal at the bottom of the bolt groove by a nut. In this type of terminal, the wire is fastened to the bottom of the bolt by a washer or center pin of appropriate shape under the nut (if the nut is a cap nut) or by an equivalent component that can transmit the pressure of the nut to the wire in the groove.
3.1.18 Screwless terminal A terminal used to connect a wire and then remove the wire, or to connect two or more detachable wires to each other. The connection is made directly or indirectly through springs, wedges, eccentric wheels or conical wheels, etc., and no special processing of the wire is required except stripping the insulation. [3.6.8 in GB16916.1-1997] 3.1.19 Adapterbzxz.net
A device that integrates the plug pin of a plug and the socket sleeve of a socket. 3.1.20 Intermediate adapter refers to a converter that can be used to connect one or more plugs to a socket through a controller, such as a dimmer, clock switch, photoelectric switch and residual current device.
3.1.21 Shutter
Refers to a movable part installed in the socket that can automatically cover at least the pry sleeve when the plug is pulled out. [3.27 in GB2099.1--1996]
3.i.22 Portable residual current device (PRCD) refers to a residual current device that is combined with a plug, a residual current device and one or more sockets or wiring devices, and is easy to move from one place to another for use when connected to a power source. 3.1.23 Trip-free PRCD is a PRCD that can return to and stay in the open position when it automatically trips after the closing operation, even if the closing command is maintained. 3.2 Symbols
This standard adopts the following symbols;
Rated current,
Rated voltage,
Rated residual operating current:
Rated residual non-operating current:
Rated making and breaking capacity:
Rated residual making and breaking capacity;
Rated limitary short-circuit current;
Rated limitary residual short-circuit current;
Short-circuit protection device;
Neutral line,
Current lag angle:
The line voltage limit value at which the PRCD whose operating function is related to the line voltage can still operate. 3
4 Basic parameters, types and classification of products
4.1 Basic parameters
4.1.1 Features overview
JB/T8755-1998
PRCD is used in single-phase circuits. They should have two poles or two poles and one continuous grounding loop (two poles are only applicable to PRCD with I≤10A).
The characteristics of PRCD should be described by the following items: a) Usage and wiring method:
b) Rated current (I);
c) Rated voltage (U.);
d) Rated residual operating current (lz);
e) Rated residual non-operating current (Ian); f) Rated frequency;
g) Rated making and breaking capacity (Im);
h) Rated residual making and breaking capacity Iαm); i) Rated limiting short-circuit current (Ine): i》Rated limiting residual short-circuit current (Iαe); k) Enclosure protection grade;
1) Operating characteristics when the residual current contains a DC component. 4.1.2 Rated value
4.1.2.1 Rated voltage
4.1.2.1.1 Rated working voltage (U)
The voltage value related to the working performance of PRCD specified by the manufacturer (hereinafter referred to as rated voltage). The preferred value of rated voltage is: 220V.
4.1.2.1.2 Rated insulation voltage
The voltage value related to the dielectric test voltage and creepage distance of PRCD specified by the manufacturer. Unless otherwise specified, the rated insulation voltage is the maximum rated voltage value. In any case, the maximum rated voltage should not exceed the rated insulation voltage. 4.1.2.2 Rated current (I)
The current that the manufacturer specifies that the PRCD can carry under uninterrupted working conditions. The preferred values of rated current are 6, 10, 13, and 16A. 4.1.2.3 Rated residual operating current (Izn) The residual operating current value that the manufacturer specifies that the PRCD must operate under specified conditions. The preferred values of rated residual operating current are: 0.006.0.01, 0.03A.
4.1.2.4 Rated residual non-operating current (IA) The residual current value that the manufacturer specifies that the PRCD must not operate under specified conditions. The preferred value of the rated residual non-operating current is 0.51zn. Note: For pulsating DC residual current, the residual non-operating current value is related to the current lag angle α (see 8.16.1). 4.1.2.5 Rated frequency
The power supply frequency used when designing PRCD, which is related to other characteristic values. The preferred value of the rated frequency is 50Hz.
4.1.2.6 Rated making and breaking capacity (Im) The effective value of the AC component of the prospective current that the manufacturer specifies that the PRCD can make, carry and break under specified conditions. 4
The minimum value of the rated making and breaking capacity: 250A. 4.1.2.7 Rated residual making and breaking capacity (1zm) JB/T8755-1998
The effective value of the AC component of the residual prospective current that the manufacturer specifies that the PRCD can make, carry and break under specified conditions. The minimum value of the rated residual making and breaking capacity: 250A. 4.1.2.8 When the main circuit is overcurrent, the limit value of the non-operating current is the maximum overcurrent value that can flow through the two poles of the residual current device without causing the residual current device to trip in the absence of any residual current.
The standard minimum value of the non-operating overcurrent of PRCD: 4I. 4.1.2.9 The maximum value of the breaking time is shown in Table 1. Table 1 Maximum breaking time of AC type PRCD
Maximum breaking time
The maximum breaking time in Table 1 is also applicable to type A PRCD, but the current value should be multiplied by a coefficient of 1.4 (for PRCD with In>0.01A) or multiplied by a coefficient of 2 (but the test current is not less than 0.03A) (for PRCD with I≤0.01A). 4.1.3 Coordination with short-circuit protection devices PRCD should be protected from short circuits with circuit breakers or fuses in accordance with relevant installation and operation procedures. The coordination between the short-circuit protection device and the PRCD shall be verified by the test specified in 8.7.2.4 under the conditions specified in 8.7.2.1 to verify that the short-circuit protection device can reliably protect the currents of the limited short-circuit current Ine and the limited residual short-circuit current Ie and below. 4.1.3.1 Rated limiting short-circuit current (Ine) The effective value of the prospective current that the PRCD protected by a short-circuit protection device can withstand under specified conditions as specified by the manufacturer without causing any changes that hinder its function.
Standard value of rated limiting short-circuit current: 1500A. 4.1.3.2 Rated limiting residual short-circuit current (I) The manufacturer specifies the effective value of the residual prospective current that a PRCD protected by a short-circuit protective device can withstand under specified conditions without causing any changes that hinder its function. The preferred value of the rated limiting residual short-circuit current: 1500A. 4.2 Types and classifications
4.2.1 Classification according to wiring method and purpose: See Figure 1. 4.2.1.1 PRCD transition converter
PRCD combined with a plug and one or two sockets. 4.2.1.2 Non-detachable residual current protection wire extension assembly. 4. 2. 1. 2. 1
PRCD with a residual current protection device with a plug connected to one end of the cable and one or several sockets connected to the other end.
4.2.1.2.2 A PRCD with a non-detachable cable and plug connected to one end of the residual current protection device and a non-detachable cable and one or several sockets connected to the other end.
4.2.1.2.3 A PRCD with a non-detachable cable connected to a residual current protection device with one or more sockets at one end and a non-detachable plug at the other end.
4.2.1.3 Residual current protection plug
4.2.1.3.1 A residual current protection device with a plug and a set of wiring terminals. 4.2.1.3.2 A residual current device with a plug and a non-detachable cable (residual current protection plug for appliances). 4.2.1.4 Wiring type PRCD
JB/T8755-1998
4.2.1.4.1 A non-detachable cable and a non-detachable plug are connected on the power supply side of the residual current device, and there is a set of wiring terminals at the output end.
4.2.1.4.2 A non-rewirable cable and a non-rewirable plug are connected to the power supply side of the residual current device, and a non-rewirable plug is connected to the output end
4.2.2 According to the type of terminal
4.2.2.1 PRCD with screw-type terminals. 4.2.2.2 PRCD with non-screw-type terminals. 4.2.3 According to the working mode
4.2.3.1 PRCD whose action function is not related to the line voltage. 4.2.3.2 PRCD whose action function is related to the line voltage. 4.2.3.2.1 PRCD that can automatically disconnect when the line voltage fails. e) It can automatically close when the line voltage is restored; b) It cannot automatically close when the line voltage is restored. 4.2.3.2.2 PRCD that cannot automatically disconnect when the line voltage fails, but can automatically trip when the power supply fails, such as when a dangerous situation occurs (for example, when a fault current occurs).
4.2. When the residual current contains a DC component, the PRCD is classified according to its action characteristics. 4.2.4.1 AC PRCD.
4.2.4.2 A PRCD.
Note: AC PRCD is temporarily available for use. Manufacturers should try to use A PRCD. 4.2.5 Classification according to ambient air temperature
4.2.5.1 PRCD for use between -5℃ and +40℃. 4.2.5.2 PRCD for use between -25℃ and +40℃. 5 Marking
5.1 Each PRCD shall be marked with the following information on a clear and visible surface in a non-disappearing manner. a) Manufacturer's name or trademark; b) Model name or catalog number: c) Product number or manufacturing date; d) Rated voltage; e) Rated frequency (when the frequency is not 50 Hz); f) Rated current: g) Rated residual operating current: h) Protection level (only when higher than IP4X): i) Operating tools of the test device, indicated by "T" or text; j) Residual current operating characteristic classification: AC type PRCD symbol:
A type PRCD symbol:
k) "Tests should be carried out before use" description; 1) PRCD classified according to 4.2.5.2 should be marked with the symbol: JB/T8755-1998
The rated voltage and rated current symbols can be represented by numbers only. These numbers can be arranged in a row and separated by a slash; or the rated current can be placed above the rated voltage and separated by a horizontal line. The power supply nature symbol should be placed immediately after the rated current and rated voltage numbers. For example: 16 A220V～, or 16/220～, or 2%～, or 16A 220V AC, etc.
In order to simplify the marking, the following simplified symbols can be used: Ampere
Neutral
Protective earth
The marking should be located on the body of the PRCD or on a plate fixed on the PRCD, and should be clearly visible after the PRCD is assembled for normal use.
The markings of items i and k should be visible during normal use. 5.2 Opening and closing positions and terminal markings
For PRCDs that are not operated by buttons, the disconnect position is indicated by the symbol "O\, and the closed position is indicated by "1" (a short straight line). For PRCDs operated by two buttons, the button used only for disconnection should be red or marked with the symbol "O". If the test button is also used for disconnection, it should still be marked with the symbol "T" instead of red. Except for the disconnecting button, other buttons should not be red. The closing button can be left in the pressed position to indicate the closed position. If a button is used to close the contacts and it can be clearly distinguished, it is sufficient for the button to remain in the depressed position to indicate the closed position. Terminals used exclusively for connecting neutral circuits should be marked with the letter "N". Terminals used to protect conductors should be marked with the symbol (Taiwan) Appropriate markings should be provided for removable wiring devices using screwless terminals: indicating the length of insulation that should be stripped before the wire is inserted into the screwless terminal.
5.3 The product manual should provide the following content
a) Tell the user that the PRCD should be tested before each use and as a normal working procedure; b) If the PRCD does not operate correctly as required by the instructions, it should be discontinued; c) Instructions for safe wiring of flexible cables, including the cable model, the number and color of cores, the maximum and minimum cross-sectional area and length of the wires, etc.;
d) It cannot be used in places other than the specified conditions of use (see Chapter 6), and instructions on not falling and immersion; e) Instructions on the risk of electric shock caused by careless use of electricity and that the PRCD cannot replace basic electrical safety protection measures. In particular, before repairing electrical equipment, the plug must be unplugged to isolate the electrical equipment from the power supply; f) If the PRCD is often tripped after being connected to the electrical equipment or cannot be tripped when tested according to the instructions, the manufacturer, seller or experienced electrician should be asked to repair it;
g) The PRCD should be directly connected to a fixed socket. 6 Normal working conditions Installation conditions
6.1 Normal working conditions
6.1.1 Ambient air
a) The upper limit of the ambient air temperature shall not exceed +40°C, and the average value within 24 hours shall not exceed +35°C; b) The lower limit of the ambient air temperature shall not be lower than -5°C or -25°C. 6.1.2 Altitude
The altitude of the installation site shall not exceed 2000m.
6.1.3 Atmospheric conditions
JB/T8755-1998
The relative humidity of the air at the installation site shall not exceed 50% when the maximum temperature is +40℃. It can have a higher relative humidity at a lower temperature. The average minimum temperature of the wettest month shall not exceed +25℃, and the average maximum relative humidity of the month shall not exceed 90%, and the condensation on the product caused by humidity changes shall be taken into account.
6.1.4 The external magnetic field at the place of use shall not exceed 5 times the earth's magnetic field in any direction. 6.1.5 The distortion of the sinusoidal waveform of the power supply shall not exceed 5%. 6.1.6 The pollution level is level 2.
6.1.7 The installation category is Class II.
6.2 Installation conditions
PRCD should be used in accordance with the requirements of the manufacturer's instructions. 7 Technical requirements
7.1 Structural requirements
The design and structure of the PRCD should ensure reliable performance during normal use and will not cause harm to the user or the surrounding environment. The grounding circuit of the PRCD should be continuous and not affected by the operation of the PRCD. The residual current device should be in a component, and the position of the flexible cable connected to it should not affect the correct operation of the PRCD. The maximum allowable length of the connecting cable between the plug of the PRCD and the residual current device part is 2m. For PRCDs with flexible cables, the protective conductor should be a yellow-green two-color conductor. The action characteristics of the PRCD should not be adjustable. The plugs and sockets of the PRCD should comply with my country's flat plug and socket system. The surface of the plastic parts of the PRCD should have a good gloss, without defects such as bubbles, cracks, missing materials, bulging, deformation, damage and burrs. Ferrous metals should be coated, and the coating should not have pinholes, streaks, delamination and peeling. The surface of the conductive parts should be smooth and straight, without burrs and corrosion marks. There should be no looseness at the screw connections or rivets. 7.1.1 Plug and socket part
7.1.1.1 Type size
The type size of the plug and socket shall comply with the requirements of GB1002. Check by measuring and the corresponding gauges specified in GB1002. 7.1.1.2 Grounding measures
7.1.1.2.1 The structure of the grounding contact shall be as follows: a) When the plug is inserted, the grounding contact is connected first, and then the current-carrying contact is connected; b) When the plug is pulled out, the current-carrying contact should be disconnected first, and then the grounding contact. Check by checking the product drawings, considering the influence of errors and checking samples against the drawings. Note: Plugs and sockets that comply with GB1002 can ensure compliance with the requirements of this clause. 7.1.1.2.2 The grounding terminal of the detachable PRCD shall comply with the corresponding requirements of 7.1.5. The size of the grounding terminal shall be the same as the size of the corresponding power supply wire terminal. The grounding terminal of the detachable PRCD with grounding contact shall be internal. Under various conditions that may occur during normal use, including loosening of the cover fixing screws and sloppy installation of the cover, the grounding requirements should be met.
The various parts of the grounding circuit should form a complete conductor, or be reliably connected together by rivets, welding, etc. Note:
1 In the requirements of this clause, screws should not be considered as parts of the contacts. 2 When considering the reliability of the connection between the various parts of the grounding circuit, the possible corrosion effect should be considered. Verify by the test of 8.2.5.
JB/T8755-1998
7.1.1.2.3 The connection between the grounding terminal and the easily accessible metal parts should be a low-resistance connection. Verify by the test of 8.2.6.4.
7.1.1.3 Operation of the grounding socket
The grounding socket should have sufficient contact pressure and its performance should not deteriorate during normal use. Verify by the test of 8.4, but only the rated current is passed through the protective grounding circuit. 7.1.1.4 Force required to remove the plug (for sockets only) The structure of the PRCD shall make it easy to insert and remove the plug from the socket and shall prevent the plug from being accidentally removed from the socket during normal use. The force required to remove the plug from the socket is shown in Table 2. Verify by the test of 8.23.
Table 2 Force required to remove the plug
Rated value
>10A16A
7.1.1.5 Structure of plugs and mobile sockets
Maximum gauge of multiple plugs
7.1.1.5.1 The structure of non-rewirable plugs or non-rewirable mobile sockets shall meet the following requirements:
a) The flexible cable cannot be removed from the electrical accessory without making the electrical accessory permanently unusable; b) The electrical accessory cannot be opened by hand or general-purpose tools such as screwdrivers. Note: If the original parts or materials cannot be used to reassemble the electrical accessory, it is considered to be permanently unusable. 7.1.1.5.2 The plug pins and portable sockets shall have adequate mechanical strength. Verified by the test of 8.8.
7.1.1.5.3 The plug pins shall be;
a) locked to prevent rotation;
b) not removable without disassembling the plug; c) securely fixed to the plug body after the plug is wired and assembled for normal use. It shall not be possible to displace the earthing pin or neutral pin of the plug to any incorrect position. Verified by inspection, manual test and the test of 8.8. Force
Single pin gauge minimum
7.1.1.5.4 The earthing socket and neutral socket of the portable socket shall be locked and not rotated. They can only be removed with tools after the socket is disassembled. Verified by inspection and manual test after the test of 8.8. 7.1.1.5.5 The socket assembly of the socket should be elastic enough to ensure sufficient contact pressure. The socket related to the insulating material parts should also meet this requirement, and can ensure safe and constant contact pressure under any normal use conditions (especially shrinkage, aging and creep of the insulating parts). Verify through inspection and tests in 8.6 and 8.23. 7.1.1.5.6 The pins and sleeves should be corrosion-resistant and wear-resistant. Check through inspection.
7.1.1.5.7 The casing of detachable electrical accessories should be able to completely enclose the terminal blocks and the ends of the flexible cable. Its structure should enable the wires to be correctly connected. When the electrical accessories are wired and assembled according to normal use requirements, there will be no dangers of the following:
a) The wire cores of the wires are squeezed against each other, causing damage to the wire insulation; b) The wire cores of the wires connected to the live terminals are in contact with easily accessible metal parts; 93 The plug pins shall be;
a) locked to prevent rotation;
b) not removable without disassembling the plug; c) securely fixed to the plug body after the plug is wired and assembled for normal use. It shall not be possible to displace the earthing pin or neutral pin of the plug into any incorrect position. This shall be verified by inspection, manual test and test of 8.8. Force
Single pin gauge minimum
7.1.1.5.4 The earthing and neutral sockets of mobile sockets shall be locked and not rotated. They can only be removed with tools after disassembling the socket. This shall be verified by inspection and manual test after test of 8.8. 7.1.1.5.5 The socket assembly of the socket shall be sufficiently elastic to ensure sufficient contact pressure. Contact pressure Sockets related to insulating material parts shall also meet this requirement, ensuring safe and constant contact pressure under any normal use conditions (especially shrinkage, aging and creep of insulating parts). Verify by inspection and the tests of 8.6 and 8.23. 7.1.1.5.6 Pins and sockets shall be corrosion and wear resistant and shall be checked by inspection.
7.1.1.5.7 The housing of detachable electrical accessories shall be able to completely enclose the wiring terminals and the ends of the flexible cables. Its structure shall enable the wires to be properly connected. When the electrical accessories are wired and assembled according to normal use requirements, there shall be no danger of the following:
a) The wire cores of the wires squeeze each other, causing damage to the wire insulation; b) The wire cores of the wires connected to the live terminals come into contact with easily accessible metal parts; 93 The plug pins shall be;
a) locked to prevent rotation;
b) not removable without disassembling the plug; c) securely fixed to the plug body after the plug is wired and assembled for normal use. It shall not be possible to displace the earthing pin or neutral pin of the plug into any incorrect position. This shall be verified by inspection, manual test and test of 8.8. Force
Single pin gauge minimum
7.1.1.5.4 The earthing and neutral sockets of mobile sockets shall be locked and not rotated. They can only be removed with tools after disassembling the socket. This shall be verified by inspection and manual test after test of 8.8. 7.1.1.5.5 The socket assembly of the socket shall be sufficiently elastic to ensure sufficient contact pressure. Contact pressure Sockets related to insulating material parts shall also meet this requirement, ensuring safe and constant contact pressure under any normal use conditions (especially shrinkage, aging and creep of insulating parts). Verify by inspection and the tests of 8.6 and 8.23. 7.1.1.5.6 Pins and sockets shall be corrosion and wear resistant and shall be checked by inspection.
7.1.1.5.7 The housing of detachable electrical accessories shall be able to completely enclose the wiring terminals and the ends of the flexible cables. Its structure shall enable the wires to be properly connected. When the electrical accessories are wired and assembled according to normal use requirements, there shall be no danger of the following:
a) The wire cores of the wires squeeze each other, causing damage to the wire insulation; b) The wire cores of the wires connected to the live terminals come into contact with easily accessible metal parts; 9
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