GB 17464-1998 Safety requirements for threaded and threadless clamps used to connect copper conductors
Some standard content:
17464-1998
This standard is equivalent to IEC999 (1990 first edition connector - safety requirements for threaded and threadless fasteners for connecting copper conductors). It is applicable to threaded and threadless clamps used for electrical connections in electrical appliances or equipment (except digital circuits and signal circuits).
Appendix A, Appendix B and Appendix C of this standard are standard appendices, and Appendix D is a reminder appendix. This standard is proposed by the Ministry of Machinery Industry.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Electrical Accessories. This standard was drafted by the Guangzhou Electrical Science Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Luo Huaiping, He Weien, Sun Wanneng, and Yan Cuiqin. This standard is entrusted to the National Technical Committee for Standardization of Electrical Accessories to interpret GB 17464-1998
IEC Foreword
This standard is submitted by SC of IEC.TC23 (Technical Committee for Electrical Accessories) 23F (Connector Subcommittee). This standard is based on the following documents:
June Legal Document
23F(CO)28
Voting Report
23F(CO)32
For details of the implementation of this standard, see the voting report listed in the table above. This standard references the following IEC publications: IEC228A:1982 Conductors for insulated cables
Other publications referenced are:
ISO 1456:1974
ISO 2081:1986
ISO 2093:1986
Metallic coatings
Metallic coatings
Tin coating
February Procedure Documents
23F(CO)33
Voting Report
23F(CO)38
First Supplement: Guide to Dimensional Limits of Round Conductors
Zinc coating on steel or iron
Technical requirements and test methods
1 Scope
National Standard of the People's Republic of China
Connecting devices---Safety requirements for serew-lype and serewless-type clamping unitsfar electrical coppcr conductorsGB 17464—1998
idt IEC 999:1990
This standard applies to threaded and non-threaded fasteners as independent units or as integral parts of equipment, with a rated current voltage not exceeding 1000V, a frequency not exceeding 1000IIz and a rated DC voltage not exceeding 1500V. They are used to connect hard (single core or stranded) and/or soft copper conductors with a core cross-sectional area of 0.5mm2 to 35mm (or corresponding AWG wire gauge size) (in accordance with IEC228 requirements). This standard applies to clamps mainly used to connect untreated conductors. Note: This standard does not apply to:
: a) clamps for crimping or aluminum welding; b) clamps for digital or signal circuits;
c) clamps for flat quick-connect terminals, insulation-insulating connectors and twist-on connectors; the requirements for these clamps are under consideration. 2 Definitions
2.1 Clamping unit
Parts necessary for mechanical clamping and electrical connection of wires in terminals, including parts necessary for maintaining contact pressure. 2.2 Terminal
Conductive part of one pole consisting of one or more clamping parts and, if necessary, insulation. 2.3 Connecting device Connecting device consisting of one (or more) terminals fixed to a base or integral part of a device. Device used for electrical connection of one (or more) wires.
2.4 Screw-type clamping unit A screw-type clamping unit is used to connect two wires and then disconnect them, or to interconnect two or more wires and then disconnect them. It is a clamping unit that is connected directly or indirectly by any kind of screw or nut. 2.5 Pillar type purple parts pillarelampinguniu The wire is placed in a hole or groove and clamped under the screw end. The clamping pressure can be applied directly by the screw end or through an intermediate component that is subjected to the force of the screw end. Note: An example of a cylindrical clamping unit is shown in Figure 2.
2.6 Screw clamping unit A threaded clamping unit that clamps a conductor under a screw head. The clamping pressure can be applied directly by the screw head or through an intermediate component such as a washer, clamping plate or anti-loosening component. Note: An example of a screw clamping unit is shown in Figure 3
Approved by the State Quality and Technical Supervision Commission on August 17, 1998 and implemented on September 1, 1999
2.7 Stud clamping unit GB17464—1998
A threaded clamping unit that clamps a conductor under a nut. The clamping pressure can be applied directly by a nut that has been properly processed or through an intermediate component such as a washer, clamping plate or anti-loosening component. Note: An example of a bolt clamping unit is shown in Figure 3.
2.8 Saddle clamping unit A threaded clamping unit that clamps a conductor under a bolt by means of two or more screws or nuts. An example of a saddle clamping unit is shown in Figure 4.
2.9 Mantle clanping unit A threaded clamping unit that clamps a conductor under a bolt by means of a nut and a suitably formed washer under the nut (if the nut is a ferrule nut, such as through an intermediate core) or by means of an equivalent part that transmits the force of the nut to the conductor in the bolt slot. NOTE An example of a single terminal is shown in Figure 5.
2.10 Screwless-type clamping unit A clamping unit used for connecting and disconnecting a conductor after connection, or for interconnecting and disconnecting two or more conductors after connection, and which is connected directly or indirectly by means other than screws. 2.10.1 Universal clamping unit (for all types of conductor) 2.10.2 Non-universal clamping unit (for only a certain type of conductor) Non-univeraal clamping unit (for only a certain type of conductor) For example: Push-wire clamping unit (for single-core conductor only) Push-wire clamping unit (for only hard single-core and graded conductors) Note: Example of a special clamping unit Figure 6.2.11 Rated connecting capacity The cross-sectional area of the thickest hard conductor that can be connected as specified by the manufacturer of the type of clamp. 2.12 Ambient temperature The air temperature around the clamping unit and its housing (if any). 2.13 Temperature rise The difference between the temperature of the test part and its housing (if any) measured under the load specified in the test specification and the ambient temperature. 2.14 Unprepared conductor is a conductor whose insulation has been cut off and a certain length of insulation has been stripped off when inserted into the clamping part. Note: A conductor that has been shaped for the purpose of clamping, or a conductor whose strands have been twisted to make the wire stronger, is considered to be a pre-prepared conductor. 2.15 Pre-prepared conductor is a conductor whose insulation has been stripped off at the end and is equipped with a ring, a wire connector or a wire ear. 3 General requirements
The design and manufacture of the clamping part should ensure that it performs reliably and poses no danger to the user or the surrounding environment when used properly. Whether it is qualified or not is checked by carrying out all the specified tests. 4 General instructions on tests
4.1 The tests specified in this standard are all type tests. The tests should be carried out in accordance with the test requirements specified in the standard. 4.2 Unless otherwise specified, the sample should be tested after being installed in the delivery state and in accordance with the normal use requirements. The test is carried out at an ambient temperature of (20=5)°C.
4.3 The tests in Chapter 8 shall be carried out in the order specified in the clauses. 4.4 Unless otherwise specified, all tests shall be carried out using a group of at least 3 specimens. ..comGB 174641998
4.5 If more than one specimen fails in any test, the clamps are deemed not to comply with the requirements of this standard. If only one specimen fails in a test, the test and the previous test or tests that may affect the test results shall be repeated on another set of three specimens. All specimens shall pass the retest. 4.6 Another set of three specimens may be submitted at the same time as the first set of specimens for retesting when necessary. Note, 1
5 Main characteristics
The standard rated connection capacity of clamps is: 0.5 mm2, 0.75 mm2, 1 mm2, 1.5 mm2, 2.5 mm, 4 mm2, 6 mm*, 10 mm2, 16 mm2, 25 mm* and 35 mm2. Note,
6 Connection of wires
6.1 Generally, optical clamps are only suitable for connecting one wire. Some types of clamps are also used to connect two or more wires of the same or different nominal cross-sectional areas or structures.
Clamps can virtually connect wires that have been treated. 6.2 Unless otherwise specified in the relevant product standards, each clamp shall be able to connect at least two adjacent wires with smaller cross-sectional areas in addition to its rated connection capacity (for example, a clamp with a rated connection capacity of 1 mm2 should be able to firmly clamp a wire of 0.5 mm2, 0.75 mm2 or 1 mm2 of the same type). 6.3 The relationship between the rated connection capacity of the clamp and the connectable wire and wire diameter is shown in Table 1. Table 1 Specified connection capacity and connectable conductors Connectable conductors and their theoretical true diameters Specification connection Specification connection Specification wire Hard conductor Single-core flexible conductor Hard conductor Single-core flexible conductor Twisted conductor Twisted conductor 1_ Note: The original notes are \1.5 and 1.6, which are not accepted by some countries at present. Therefore, TC 23 (Technical Committee for Equipment Annex) is considering revising them. ”
2) Note that the inner diameter is \ Lu before. Some manufacturers do not use mm. Instead, they use wire gauge (for example, the United States and Canada use AWG wire gauge) to indicate the cross-sectional area of the wire. The relationship between mm and AWG wire can be found in Appendix A Rated connecting capacity
Hard wire
GB 17464—1998
Table 1 (end)
Connectable wires and their theoretical diameters
Soft wires
* According to IEC Publication 228A, these are only the sizes of Class 5 soft wires, 1) Nominal diameter + 5%.
2) I, K, M Note: The maximum diameter of hard and soft conductors is based on Table 1 of IEC Publication 228A, while the maximum diameter of AWG conductors is based on ASTM L172-71, ICEA Publication S-19-81, SCEA Publication S-66-524, ICEA Publication S-66-516 6.4 Unless otherwise specified by the manufacturer, threaded clamps shall be able to firmly clamp the hard wires and teaching wires shown in Table 1. If this requirement is met, no marking is required.
If the threaded clamp can only connect one type of wire (for example, only hard wire or only soft wire) according to the manufacturer's specifications, in order to ensure correct connection, it should be clearly marked on the entire product with the letters "1\ (hard) or \f\ (soft)" or it should be indicated in the smallest packaging unit or in the technical information and/or product log. Compliance shall be checked by observation and the tests of 8.1 and 8.6. 6.5 Unless otherwise specified by the manufacturer, threadless clamps shall be able to clamp the rigid and flexible conductors shown in Table 1; those that meet this requirement need not be marked in any way.
If threaded clamps are only capable of connecting single-core conductors as specified by the manufacturer, they shall be clearly marked with the letters \s\ or "sol" (for single-core) on the final product to ensure proper connection, or shall be clearly marked on the smallest packaging unit or in the technical information and/or product catalogue.
Note: See 2.10.
Compliance shall be checked by observation and by the test of 8.1. 6.6 The method of connecting and disconnecting the wire on the threadless clamp is as follows: General clamps should be opened with a general tool or a suitable device integral with the clamp before inserting or removing the wire:
Push-wire clamps only need to simply insert the wire to connect the wire, and an operation must be performed to disconnect the wire, rather than just lifting and pulling the wire to disconnect.
It is allowed to open the clamp with a general tool or a suitable device integral with the clamp to facilitate the insertion or removal of the wire. Whether it is qualified, it shall be checked by observation and the test of 8.3. 7 Structural requirements
7.1 Current-carrying parts, including all current-carrying parts at the terminals, shall be made of metal. The metal used shall have the mechanical strength, conductivity and corrosion resistance to meet the expected use requirements under the conditions encountered when the equipment is working. Whether it is qualified, it shall be checked by observation and, if necessary, chemical analysis. Note: Within the permissible range of concentration and under normal chemical contamination conditions, the applicable metals are: Steel: GB17464-1998 steel alloy, for parts made of cold rolled sheets, the content of tantalum is at least 58%; for other parts, the content of steel is at least 50%; Stainless steel with a chromium content of at least 13% and a carbon content of not more than 0.09%; Steel with a zinc coating of at least 5μm in thickness in accordance with ISO1456; Steel with a tin coating of at least 20μm in accordance with ISO2093; Steel with a tin coating of at least 12μm in thickness. Current-carrying parts that may be subject to mechanical wear should not be made of copper with a coating; Parts that are in contact with each other under humid conditions should not be made of metals with a large difference in chemical potential. Compliance is checked by test. This test method is under consideration. NOTE: Springs, elastic parts, clamping plates, clamping screws, etc. are not considered as parts primarily used for current carrying (see 7.3). Other materials and chain layers may also be used if the relevant product standard specifies appropriate corrosion tests. The use of aluminum alloys as current carrying parts requires additional tests, which are under consideration. 7.2 Clamps should be designed and manufactured so that contact pressure should not be transmitted through insulating materials (except porcelain or pure mica). Unless the metal parts are sufficiently elastic to compensate for the shrinkage or deformation of the insulating material. The possibility of using materials other than metal to compensate for any possible deformation (such as shrinkage) is under consideration. Compliance is checked by tests such as elastic effect tests, which are under consideration. 7.3 The grounding clamp should not present any risk of corrosion due to contact with the copper of the grounding conductor or other metal in contact with it. The body of the grounding clamp should be made of brass or other metal with corrosion resistance not less than brass, except where the body is part of a metal frame or casing. In the latter case, the screws or nuts should be made of brass or other metal with corrosion resistance not less than brass. If the body of the grounding clamp is part of an aluminum alloy frame or casing, measures should be taken to prevent corrosion caused by contact between copper and aluminum or with aluminum alloys. Measures should be taken to ensure that the metal frame or casing is The surface is clean when clamping the purple conductor. Compliance is checked by inspection.
Note: Electroplated thorns that can withstand the corrosion test are regarded as metals with corrosion resistance not less than that of yellow phase. Tests to determine corrosion resistance are still under test. 7.4 Screws and nuts used to clamp conductors shall not be used to fix other parts, but may be used to keep the clamping parts in normal position or prevent them from rotating.
Compliance is checked by inspection.
Screws should not be made of soft or easily deformable metals such as zinc or lead. Note: The use of aluminum alloy screws requires additional tests, which are under test. 7.5 Special nails or nuts for grounding clamps should be fully locked to prevent accidental loosening, and they should not be able to be loosened without the aid of tools.
Note: Generally speaking, Figures 2 to 5 The fasteners shown meet the requirements of this standard as long as they pass the tests of this standard. If the overall product is expected to be subject to vibration or alternating speed, elastic components (such as pressure plates) may be installed. 7.6 Threadless clamps shall connect and disconnect conductors in accordance with the manufacturer's regulations. The relevant departments shall regard this regulation as part of their product marking requirements.
When disconnecting a conductor, one operation must be performed, that is, in normal use, whether with or without the help of a tool, manual operation is required to disconnect the conductor. The conductor must never be disconnected by pulling the conductor alone. The hole used for connecting or disconnecting the conductor by the tool should be obviously different from the wire entry hole. Whether it is qualified or not, it shall be checked by observation.
7.7 Threadless clamps intended for interconnecting two or more conductors shall be designed and manufactured to clamp each conductor separately:
When connecting or disconnecting a conductor, the conductors can be connected or disconnected separately at the same time. Such clamps shall be able to reliably clamp any number of conductors within the specified maximum number. Whether it is qualified or not, it shall be checked by observation and the test of 8.4. GB 17464—1998
7.8 Threadless clamps shall be designed and manufactured to prevent the incorrect insertion of conductors. To achieve this requirement, suitable markings may be given on the clamping element or on the smallest packaging unit, or in the technical data and/or product catalogue, indicating the length of insulation to be stripped before the conductor is inserted into the clamping element. Compliance is checked by inspection.
7.9 The clamping element shall have adequate mechanical strength. Compliance is checked by the tests of 8.5 and 8.6 for threaded clamping elements and by the tests of 8.3 and 8.5 for threadless clamping elements.
7.10 The clamping element shall be designed and constructed so that it can clamp the conductor without excessive damage to it. Compliance is checked by inspection after the test of 8.4. 7.11 The clamping element shall be designed and constructed so that it can firmly clamp the conductor between metal surfaces. Compliance is checked by inspection during the test of 8.5. Previous: To check whether the test of the clamping parts that do not clamp the wire between the gold wind surface is under consideration. 7.12 The fire clamping parts shall be designed and manufactured so that the hard wires or soft wires of the stranded wires will not fall out. Whether it is qualified, pass the test inspection of 8.2. 7.13 The clamping parts shall be designed and manufactured so that the temperature rise will not exceed the temperature rise regulations corresponding to the materials used for the clamping parts or the materials in contact with the fire clamping parts during normal use.
Whether it is qualified, carry out the test inspection of 8.7
7.14 The threadless clamping parts shall be designed and manufactured so that their electrical performance is reliable during normal use and will not affect their continued use. Whether it is qualified, carry out the test inspection of 8.8.8.9 and 8.10. 7.15 The clamping parts shall be designed and manufactured to meet the wiring requirements of 6-2 and 6.4 (for threaded clamping parts) or 6.2 and 6.5 (for threadless clamping parts) respectively. If qualified, the test of 8.1 shall be carried out. 7.16 Care shall be taken to prevent the clamping parts from being subjected to stress from the connecting conductors forming part of the cable or flexible cord (such as the cable or flexible cord of portable equipment). The relevant product standards shall require the installation of strain relief devices and the corresponding tests. 8 Tests
8.1 The connection of the thickest conductor shall be checked by the test of Appendix B or the insulation of the thickest conductor shall be removed and the hard stranded wire end and the flexible wire end shall be reshaped before insertion into the clamping parts. The wire end with insulation removed shall be fully inserted into the wire entry bracket of the clamping parts without excessive force. 8.2 Connect the three new clamping parts with new wires. The type and rated connection capacity of the conductor shall comply with the provisions of Table 1 of 6.3, and the structure of the conductor core shall comply with the provisions of the table in Appendix C. Before inserting rigid stranded conductors and soft conductors into the clamp, their wires may be reshaped. It is permitted to use tools for reshaping.
The conductor should be inserted into the clamp without excessive force. Insert the conductor into the clamp until the conductor just protrudes from the other side of the clamp and is in the position that is most likely to cause the wire to escape. Then, if there is a clamping screw, it should be tightened with the torque specified in 8.6. After the test, the creepage distance and electrical clearance should not be reduced below the specified values of the relevant product standards due to the wire protruding from the outside of the clamp.
8.36.5 and 6.6 threadless clamps should be tested with the thickest wire as follows. 一 Install only single-core wires:
Install rigid (single-core and stranded) wires! Install rigid (single-core and stranded) and soft conductors. GB17464:-1998
Connect and disconnect each type of conductor for which the clamp is intended 5 times. Use a new conductor each time, except for the 5th time. For the 5th time, clamp the conductor used for the 4th time in the same position. For each connection, push the conductor as far as possible into the terminal until it is obvious that the connection is correct. After each connection, twist the wire 90° and then disconnect it. After these tests, the clamp should not have any damage that would affect its continued use. 8.4 Check whether the requirement of 7.10 (i.e. whether the requirement of "clamping the wire will not damage the wire") is met. Connect the three new clamps with new wires and install them in the test equipment shown in Figure 1. The type of wires installed and the minimum and maximum cross-sectional areas shall meet the requirements of 6.2 and 6.4 (for cracked clamps) or 6.2 and 6.5 (for threadless clamps) respectively: first connect the wire with the smallest cross-sectional area; then connect the wire with the largest cross-sectional area. The length of the test wire shall be 75 tnm plus the length of Table 2. The test conductor is then connected to the clamping element and, if there is a clamping screw or nut, it is tightened with the torque specified in 8.6. Each conductor is tested as follows:
Insert the end of the conductor into the corresponding bushing in the plate, which is positioned at a height (H) below the test equipment: the bushing hole diameter and H value are given in Table 2. The bushing is placed in the test plane so that its center line can make a 5 mm diameter reading and is centered with the center of the clamping element outside the water surface. Then: rotate the half plate at a rate of (10 ± 2) r/min so that the distance between the opening of the clamping element and the upper surface of the bushing is the H value in Table 2 ± 15 mm. To prevent the conductor from being entangled, twisted or rotated, the bushing can be lubricated.
Hang the weight specified in Table 2 on the end of the conductor. The test lasts for 15 During the test, the conductor shall not fall out of the clamp or break in the vicinity of the clamp. The conductor shall not be damaged to the point of being unusable. Table 2
Cross-sectional area of the conductor
1) Adjustment for height H: 15 mm
Diameter of arm hole \"
Height I:
2) If the diameter of the bushing hole is not large enough to allow the conductors to fit in without bundling them together, a bushing with a larger hole diameter may be used. Corresponding weight
8.5 A new clamping part is used to carry out a tension test on a new conductor. The type of conductor used and the minimum and maximum cross-sectional areas shall comply with the requirements of 6.2 and 6.4 (for threaded clamping parts) or 6.2 and 6.5 (for non-threaded clamping parts). If screws are present, they shall be tightened to the torque specified in 8.6. If the screws have a slotted hexagonal head, the torque applied shall comply with the provisions of column I of Table 4 or with a greater value specified by the manufacturer. Each conductor is then subjected to the tensile force specified in Table 3 for 1 min, the force being applied in the direction of the conductor, but without explosive force. Conductor cross-sectional area:
During the test, the conductor shall not fall out of the clamp. GB 17464--1998
8.6 The threaded clamp shall be fitted with the copper conductor specified in 6.2 for the test. The conductors with the smallest and largest cross-sectional areas shall be alternately fitted to each clamp:
Tighten and loosen the screws and nuts 5 times using a suitable test screwdriver or wrench. When tightening, the torque to be applied shall be the torque specified in the corresponding column of Table 4 or in the corresponding Tables 5 to 8, whichever is greater. Each time the screw or nut is loosened, a new conductor shall be used. If the manufacturer declares that a greater force is to be used and provides relevant information, a greater torque may be selected. Column 1 applies to headless screws that will not fall out of the screw hole after tightening, and other screws that cannot be tightened with a screwdriver with a mouth wider than the screw diameter.
Column 1 applies to nuts with cap-type clamps tightened with a screwdriver. Column 2 applies to other screws in clamps tightened with a screwdriver. Column 4 applies to other screws or nuts other than nuts in cap-type clamps that are not tightened with a screwdriver. Column 5 applies to nuts in cap-type clamps that are not tightened with a screwdriver. Screws with a slotted hexagonal screw head and different values in columns 1 and 2 are tested twice. First, apply the torque specified in column 1 to the hexagonal screw head on a group of 3 specimens, and then apply the torque specified in column 1 to another group of specimens using a screwdriver. If the values in columns 1 and 2 are the same,Only tests with screwdrivers are required. The threads of screws and nuts used to clamp conductors shall be metric ISO threads or threads comparable to metric ISO threads in terms of pitch and mechanical strength.
During the test, the clamping parts shall not show any damage that would affect the continued use of the clamping parts due to screw breakage, damage to the screw head groove, threads, washers or U-clip, etc.
The specified nominal diameter of the hood-type clamping parts is the nominal diameter of the screwdriver. The shape of the blade of the test screwdriver must be suitable for the screw head being tested, and the screws and nuts should not be tightened with explosive force. Table 4
Nominal diameter of thread
2.8D≤3.0bZxz.net
3. 0≤D≤3. 2
3. 2-D≤3. 6
3.6
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