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Mechanical Industry Standard of the People's Republic of China
JB/T 6476-1992
JF1 Base Enclosed Terminal Block
Published on August 6, 1992
Implementation of the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
JF1 Base Enclosed Terminal Block
Subject Content and Scope of Application
JB/T6476-1992
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage conditions of JF1 base enclosed terminal blocks.
This standard applies to JF1 base enclosed terminal blocks (hereinafter referred to as terminal blocks) with a cross-section of 0.5 to 10 mm for connecting round copper wires in circuits with an AC frequency of 50 Hz (or 60 Hz), a rated voltage of 660 V and below or a DC voltage of 440 V and below. Reference standards
GB1497
GB2828
GB2829
GB4207
ZBK62002
JB2836
JB3975
JB4261
3 Product classification
3.1 Model
Basic standards for low-voltage electrical appliances
Basic environmental test regulations for electric and electronic productsBasic environmental test regulations for electric and electronic productsBatch inspectionCount sampling procedures and sampling tablesPeriodic inspection Check the counting sampling procedure and sampling table test Ad; low temperature test method
Test Db: alternating damp heat test method
Determination method of comparative tracking index and proof tracking index of solid insulating materials under humid conditions Fire hazard test of electrical and electronic products·Glow wire test method and guidelines Method for compiling product models of general auxiliary parts of electrical equipment Electroplating and chemical coating of electrical products Basic standards for terminal blocks for round copper wires
Terminology of auxiliary parts of switchgear and controlgear The compilation of terminal block models must comply with the provisions of ZBK62002. The specific meanings are as follows:
3.2 Specifications and basic parameters
The specifications and basic parameters of the terminal block are shown in Table 1. Approved by the Ministry of Machinery and Electronics Industry on August 6, 1992 O
Number of circuits
Rated cross-section of connecting wire
Design serial number
Base enclosed terminal block
Implementation on January 1, 1993
JF1-10/5
3.3 Overall dimensions
Rated cross-section
The overall dimensions of the terminal block are shown in Figure 1 and Table 2. JB/T 64761992
Rated connection capacity
Guo Guonan
JF1—2.5/2
JF1—2.5/3
JF1—2.5/5
JF1——2.5/12
JF1—10/3
JF1-10/5
JF1-10/8
Technical requirements
Overall dimensions
The terminal block must be manufactured in accordance with the product drawings and design documents approved through the prescribed procedures. 4.1 Normal working conditions
Number of circuits
a. The ambient air temperature is -25 to +40℃; JB/T 6476-1992
b. The altitude of the installation site shall not exceed 2000m; c. When the maximum temperature is +40℃, the relative humidity shall not exceed 50%. Higher relative humidity can be achieved at lower temperatures. The average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of the month is +25℃. Condensation on the surface of the product due to temperature changes shall be taken into account;
d. The pollution level is level 3;
e. The installation category is category 1.
4.2 General requirements
4.2.1 Appearance
8. The surface roughness of the parts and the appearance quality of the coating shall comply with the requirements of the drawings and design documents. The surface of metal parts shall not have obvious burrs or cracks. The surface of plastic parts shall be flat and shiny, without cracks, flash, dark bubbles and other defects; each circuit on the terminal block shall be marked in an obvious place; b.
The recommended color of the insulating parts is fruit green;
The terminal block shall have a transparent cover.
4.2.2 Dimensions
The overall dimensions and installation dimensions shall comply with the provisions of Article 3.3. The plating thickness of metal parts shall comply with the requirements of the drawings. a.
The rated cross-section of the terminal shall be verified in accordance with the provisions of Article 5.3.6. The verification gauge shall be able to enter the fastening device of the terminal by its own weight; b.
The minimum creepage distance is 10mm and the minimum electrical clearance is 8mm. c.
4.3 Performance requirements
4.3.1 Insulation and shield
a. They shall be made of flame-retardant thermoplastics and be able to withstand the specified fire hazard test. The residual flame shall be extinguished within 30 seconds after the test; b. The comparative tracking index (CTI) of the insulating material shall be greater than or equal to 175.4.3.2 Mechanical strength of terminals
Perform the mechanical strength test of the terminals in accordance with 5.3.2. After the test, the terminals are allowed to be damaged, but it shall not affect the use. 4.3.3 Clamping performance of terminals and wires Perform the clamping performance test in accordance with 5.3.3. After the test, the end of the wire shall not be damaged to affect the subsequent use. 4.3.4 Tensile strength
Perform the tensile test in accordance with 5.3.4. During the test, the wire shall not be loose from the terminal or pulled off near the fastener. After the test, the terminal or wire is allowed to be damaged, but it shall not affect normal use. The voltage drop value before and after the test shall comply with the provisions of Article 4.3.10.
4.3.5 Tension and distortion resistance
Perform the tension and distortion test in accordance with Article 5.3.5. During the entire test process, no wire should be damaged or pulled out of the terminal. 4.3.6 Vibration resistance
Perform the vibration test in accordance with Article 5.3.7. During the entire vibration test, the circuit should have no poor contact. After the test, there is no mechanical damage or deformation of the terminal block, no loosening of fasteners, and no fracture damage to the wire. 4.3.7 Low temperature resistance
Perform the low temperature test in accordance with Article 5.3.8. After the test, there should be no cracks or damage. At the same time, it can continue to be used normally. 4.3.8 Dielectric properties
Perform a dielectric strength test in accordance with 5.4.1. The terminal block should be able to withstand a power frequency withstand voltage test of 50Hz, 2500V, and 1min. During the test, there should be no breakdown or surface flashover. 4.3.9 Moisture and heat resistance
The terminal block should be able to withstand a moist and hot environment. After the alternating moisture and heat test in accordance with 5.4.2, the insulation resistance should not be less than 1.5MQ, and it can withstand a power frequency withstand voltage test of 50Hz, 2000V, and 1min. During the test, there should be no breakdown or surface flashover. 3
4.3.10 Voltage drop
JB/T64761992
Before and after the tension, temperature rise and short-time withstand current tests, the terminal block should measure the voltage drop in accordance with 5.4.3. Before the test, the voltage drop shall not exceed 3.2mV. After the test, the voltage drop shall not exceed 1.5 times the value measured before the test. 4.3.11 Temperature rise
The terminal block shall be connected to the current specified in Table 3 and the temperature rise test shall be carried out in accordance with the provisions of Article 5.4.4. The temperature rise of the terminal block shall not exceed 45K. The voltage drop before and after the test shall comply with the provisions of Article 4.3.10. Table 3
JF1-2.5/
JF1--10/口
4.3.12 Short-time withstand current
Temperature rise test current
Short-time withstand current test shall be carried out in accordance with the provisions of Article 5.4.5. The terminal block shall be able to withstand the test of short-time current of 1s with the maximum cross-section of the connecting wire of 120A/mm*. After the test, no damage that affects the use shall occur. The voltage drop before and after the test shall comply with the provisions of Article 4.3.10. 5 Test method
5.1 Test preparation
5.1.1 The terminal block used for the test should be new and clean, and installed in accordance with normal use. 5.1.2 The end of the wire with a cross-section of 0.5~2.5mm* used in the test should be stripped of a 5mm long insulation layer. The end of the wire with a cross-section of 4~10mm* should be stripped of a 9mm long insulation layer.
5.1.3 Test conditions: Unless otherwise specified, all tests must be carried out under normal test atmospheric conditions. 5.2 Dimension and appearance inspection
5.2.1 The dimensions are checked with a vernier caliper and the appearance is checked visually. The results should comply with the provisions of Articles 4.2.1 and 4.2.2. 5.2.2 The coating thickness is checked according to the method specified in JB2836, and the results should comply with the provisions of Article 4.2.2a. 5.3 Mechanical properties test
5.3.1 Materials
5.3.1.1 Fire hazard test of insulating parts
The test shall be carried out in accordance with the provisions of GB5169.4. During the test, the top of the glow wire with a temperature of 650℃ shall be in contact with the end face of the sample for 30s. The result shall comply with the provisions of Article 4.3.1a.
The position of applying the glow wire is shown in Figure 2.
Glow wire
5.3.1.2 The comparative tracking index determination of insulating materials shall be carried out in accordance with the provisions of GB4207. The result shall comply with the provisions of Article 4.3.1b. 5.3.2 Mechanical strength test of terminal blocks
The test shall be carried out in accordance with the provisions of Article 8.2.3 of JB3975. The tightening torque during the test shall be in accordance with the provisions of Table 4. The result shall comply with the provisions of Article 4.3.2. Thread diameter
JB/T64761992
Conductor cross section
Tightening torque
5.3.3 Clamping performance test
Perform the test in accordance with Article 8.2.4 of JB3975. The tightening torque during the test shall be in accordance with Table 4. The result shall comply with Article 4.3.3. 5.3.4 Tension test
Perform the test in accordance with Article 8.2.5 of JB3975. The tightening torque during the test shall be two-thirds of that specified in Table 4. The result shall comply with Article 4.3.4.
5.3.5 Tension torsion test
Perform the test in accordance with Article 8.2.6 of JB3975. The test parameters are shown in Table 5. The result shall comply with Article 4.3.5. Table 5
Conductor cross section
Thread diameter
Tightening torque
Diameter of bushing hole
5.3.6 Rated cross section verification
Verify according to 8.2.9 of JB3975. The verification result shall comply with 4.2.2b. Vibration test
Test according to 8.2.7 of JB3975. The result shall comply with 4.3.6. Heavy
5.3.8 Low temperature test
Test according to the provisions of GB2423.1 test Ad. The low temperature is -25C and maintained for 72h. After the test, immediately conduct a mechanical strength test of the conductor and the terminal under the low temperature condition by tightening and loosening 3 times (see 5.3.2). After the test, restore at least 1h under normal test atmospheric conditions until the appearance inspection is carried out after returning to normal temperature. The result shall comply with 4.2.1. 5.4 Electrical performance test
5.4.1 Dielectric strength test
The test shall be carried out in accordance with the provisions of Article 8.3.1.1 of JB3975. The result shall comply with the provisions of Article 4.3.8. 5.4.2 Alternating damp heat test
The test shall be carried out in accordance with the provisions of GB2423.4 test Db. The result shall comply with the provisions of Article 4.3.9. 5.4.3 Voltage drop measurement
The measurement shall be carried out in accordance with the provisions of Article 8.3.3 of JB3975. The result shall comply with the provisions of Article 4.3.10. 5.4.4 Temperature rise test
The test shall be carried out in accordance with the provisions of Article 8.3.4 of JB3975. The tightening torque during the test shall be two-thirds of that specified in Table 4. The result shall comply with the provisions of Article 4.3.11.
5.4.5 Short-time withstand current test
The test shall be carried out in accordance with the provisions of Article 8.3.5 of JB3975. The tightening torque during the test is shown in Table 4. The result shall comply with the provisions of Article 4.3.12. 6
Inspection rules
The test of the terminal block is divided into factory inspection, type test and periodic test. JB/T 64761992
In the above inspections, except for the appearance and size inspections, the unit product is the number of pieces, and the unit product of the other tests is the number of circuits. 6.1 Factory inspectionbzxZ.net
The product shall be inspected by the inspection department before leaving the factory, and can only leave the factory after passing the inspection. 6.1.1 According to the provisions of GB2828, a single or double sampling plan shall be adopted. The grouping, items and sequence of the inspection shall comply with the provisions of Table 6.
Inspection group
Name of inspection item
Appearance inspection
Dimension inspection
Dielectric strength test
Metal parts coating thickness inspection
Inspection method
Unqualified category
Inspection level
Inspection before assembly
When the terminal block is judged as unqualified, screening is allowed, and then the unqualified items are re-checked according to the stricter sampling plan. If it is still unqualified, it is judged as unqualified for factory inspection. 6.2
Type test
The purpose of type test is to verify whether the design and performance of the terminal block meet the requirements of the standard. Type test shall be carried out in the following cases: a.
Just completed trial samples;
When the design performance or product quality is affected by changes in process, materials or structure; When the national quality supervision agency proposes the requirement of type test. Type test rules
Type test is considered qualified only when all samples pass the sequential tests. Only products that pass the type test can be identified. 6.2.2
Type test items
Tests are conducted in groups. Each group uses new samples. The type test groups, items, sequence and number of samples shall comply with the provisions of Table 7. Table 7
Inspection group
Sequence number
Item name
Appearance inspection
Dimension inspection
Rated cross-section verification
Mechanical strength test of terminal blocks
Clamping performance test
Metal parts coating thickness inspection
Fire hazard test of insulating parts
Determination of comparative tracking index of insulating materials Tensile test
(Measure voltage drop before and after the test)
Inspection method
Number of samples
JF1-10/口
Determined according to actual conditions
Inspection group
Sequence number
6 .3 Periodic test
JB/T6476—1992
Continued Table 7
Name of test item
Tensile torsion test
Low temperature test
Vibration test
Dielectric strength test
Alternating damp heat test
Temperature rise test
(Measure voltage drop before and after test)
Short-time withstand current test
(Measure voltage drop before and after test)
Test method
JF1-10/
Products after finalization should be tested every 5 years
Periodic test is a test to regularly verify whether the product can maintain stable performance during the production process. A periodic test.
6.3.1 Regular test rules
The samples used for regular test shall be randomly selected from the products produced in this cycle that have passed the factory inspection according to the provisions of GB2829 using a single sampling plan.
During the regular test, if one test group fails, it shall be judged as unqualified. 6.3.2 Regular test items
The test shall be carried out in groups, and each group shall use new samples. The regular test groups, items, sequence and number of samples shall comply with the provisions of Table 8. Table 8
Sequence number
Item name
Mechanical strength test of terminal blocks
Dielectric strength test
Alternating damp heat test
Temperature rise test
(Measure voltage drop before and after the test)
Short-time withstand current test
(Measure voltage drop before and after the test)
7 Marking, packaging, transportation, storage
7.1 Product marking
Inspection method Failure
Terminator should have permanent and clear product markings; manufacturer name or trademark;
b. Product model, rated voltage, rated cross section. Type
JF1-10/□
Judgment array
7.2 Packaging
7.2.1 The packaging of the product must be able to prevent damage during transportation and meet the requirements of rain or moisture resistance. The packaging box should generally contain a packing list, a certificate of conformity and an instruction manual.
7.2.2 The packaging mark should be clear and neat, and it should not become blurred due to long-term transportation or storage. The mark generally includes the following contents; 7
Product name, model and quantity;
Box size (length × width × height);
Net weight and gross weight;
Destination station (port) and consignee;
Departure station (port) and consignor;
JB/T6476-1992
Mark with "electrical appliance", "handle with care", "keep away from moisture", "upward" and packaging year and month. f.
Transportation and storage
Environmental conditions for transportation and storage: the lower limit of low temperature is -40℃, the upper limit of high temperature is +55℃, the free fall height shall not exceed 250mm, and the rest shall comply with the 10th of GB1497.5. Additional Notes:
This standard was proposed and managed by Tianjin Electric Drive Design Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Hangzhou Electric Industry Company. The main drafters of this standard were Xu Bo and Xu Qicheng. o0
People's Republic of China
Mechanical Industry Standard
JF1 Base Enclosed Terminal Block
JB/T 64761992
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Number of words xXX, xXx
Format 880×1230
Sheet X/X
Edition X, XX, 19XX
Xth Printing Edition, XX, 19XX
Number of Prints 1-XXX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://wwwJB.ac.cn661_99
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