JB 8735.1-1998 Rubber insulated flexible cords and flexible cables with rated voltage up to and including 450/750V Part 1: General provisions
Some standard content:
JB8735.1~8735.3—1998
This standard is a supplement to GB5013.1~5013.7—1997 Rubber insulated cables with rated voltages of 450/750V and below. The products covered by this standard were originally specified in GB5013.2—85 and GB3958—83, but GB5013.1-5013.3—85, GB5013.4—87 and GB3958—83 have been revised. The revised GB5013.1~5013.7—1997 is equivalent to using Part 17 of IEC245 standard. Therefore, some products have not been included despite the demand in the domestic market and export trade. The main technical parameters, basic test conditions and performance indicators of the products in this standard are in line with the provisions of GB5013.1~5013.7--1997.
This standard is proposed and managed by the National Wire and Cable Standardization Technical Committee. The drafting unit of this standard is Shanghai Cable Research Institute, Ministry of Machinery Industry. The main drafters of this standard are Zhu Hao, Zeng Quan and Zhu Yizhen. 34
1 Scope
Standard of the Machinery Industry of the People's Republic of China
Rubber insulated cords and flexible cables of rated voltages up to and including 450/750 VPart 1: General requirements
Rubber insulated cords and flexible cablesof rated voltages up to and including 450/750 VPart 1: General requirementsJB8735.1—1998
This standard specifies the product structure of rubber insulated cords and flexible cables of rated voltages up to and including 450/750 V and below, general technical requirements for finished cables, tests, delivery lengths, acceptance rules, markings and packaging. This standard applies to copper core rubber insulated cords and flexible cables for power, household appliances and various mobile electrical equipment and tools with rated voltages up to and including 450/750 V.
This standard includes rubber insulated cords and cables of the Y and R series. The technical requirements of various types of cables are specified in the subsequent product standards JB8735.2 and JB8735.3.
This standard should be used together with JB8735.2, JB8735.3 and other parts. 2 Reference 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, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB2900.10 — 84 | | tt | t||JB 8735.3—1998
Electrical technical terminology Wires and cables (eqIEC50—446--1983) General test methods for cable insulation and sheath materials (idtIEC811—1993) Rubber insulated cables with rated voltages of 450/750V and below (idtIEC245—1994) Rules for rounding off numbers
Conductors of cables (idtIEC228—1978) Delivery trays for wires and cables
Rubber insulated flexible cords and cables with rated voltages of 450/750V and below Part 2: General purpose rubber sheathed flexible cables
Rubber insulated flexible cords and cables with rated voltages of 450/750V and below Part 3: Rubber insulated braided flexible wires
When other standards must be referenced, they should be specified in the corresponding subsequent product standards. 3 Terms, symbols and codes
3.1 Terms
3.1.1 The terms and definitions of this standard are explained in GB2900.10. 3.1.2 Rubber mixture
Rubber mixture is a mixture of natural rubber and (or) synthetic elastomers after appropriate selection, proportioning, processing and vulcanization. Its unique components are natural rubber and (or) synthetic elastomers. Approved by the Ministry of Machinery Industry on May 28, 1998
Implementation on November 1, 1998
JB 8735. 1-1998
Vulcanization refers to the next process after the insulation and (or) sheath are extruded, the purpose of which is to make the elastomer permanently cross-linked. 3.1.3 Test type
3.1.3.1 Type test (symbol T)
Type test refers to the test conducted on a type of cable specified in this standard before delivery according to general commercial principles to prove that the cable has good performance and can meet the specified use requirements. The essence of type tests is that once these tests are performed, they do not need to be repeated. If changes in cable materials or design affect the performance of the cable, they must be repeated. 3.1.3.2 Sampling test (symbol S)
Sampling test is a test performed on a sample of finished cable or a component taken from a finished cable to prove that the product meets the design specifications. 3.1.3.3 Routine test (symbol R)
Routine test refers to the test performed by the manufacturer on all finished cables. 3.1.4 Rated voltage
Rated voltage is the reference voltage for cable design and electrical performance testing. Rated voltage is expressed as U./U, in V. U. is the effective value of the voltage between any phase conductor and "ground" (metal shield, metal sheath or surrounding medium). U is the effective value of the voltage between any two phase conductors of a multi-core cable or single-core cable system. When used in an AC system, the rated voltage of the cable should be at least equal to the nominal voltage of the cable system. This condition applies to both U. and U value.
When used in a DC system, the nominal voltage of the system should not be greater than 1.5 times the rated voltage of the cable. Note: If the operating voltage of the system exceeds 10% of the nominal voltage of the system for a long time, the cable can be used at an operating voltage 10% higher than the rated voltage if the rated voltage of the cable is at least equal to the nominal voltage of the system. 3.2 Symbols and codes
3.2.1 Classification by series
Cable series codes for mobile electrical equipment, etc.: Cable series codes for household electrical equipment · 3.2.2 Classification by material characteristics
Copper conductor
Natural natural styrene-butadiene rubber mixture
Sheath natural styrene-butadiene rubber mixture
3.2.3 Classification by use characteristics
Outdoor use
3.2.4 Classification by structural characteristics
Light type
Medium type
Heavy type,
Structure type with rubber protective layer
Twisted pair type
3.3 Product representation method
·Omitted
3.3.1 Products are represented by model, specification and standard number. Specifications include rated voltage, number of cores and nominal conductor cross-section, etc. 3.3.2 Example
General rubber sheathed flexible cable, light, outdoor, rated voltage 300/300V, blue core, 0.5mm2, expressed as: YQW-300/3003X0.5JB8735.2-1998General rubber sheathed flexible cable, heavy, rated voltage 450/750V, four cores, three large and one small 3×50mm2+1×16mm2, expressed as: YC-450/7503X50+1X16JB8735.2--199836
4 General requirements for cable structure
4.1 Conductor
JB 8735.1-1998
4.1.1 The conductor should be annealed round copper wire. The single wire in the conductor can be non-tinned or tinned round copper wire. Tinned round copper wire should be covered with an effective tin layer.
4.1.2 Structure
The maximum diameter of a single wire in a conductor shall comply with the requirements of GB/T3956 or the provisions in subsequent product standards. 4.1.3 Isolation layer between conductor and insulation
An isolation layer made of suitable material may be placed between a non-tinned or tweezers-plated conductor and the insulation. After the aging test specified in Table 1, the conductor shall not turn black with or without an isolation layer. 4.1.4 Structure inspection
The conductor structure shall be inspected by inspection and measurement and shall comply with the requirements of 4.1.1, 4.1.2 and GB/T3956 or the provisions in subsequent product standards.
4.1.5 Resistance
The resistance of each core conductor of the cable at 20°C shall comply with the corresponding requirements specified in GB/T3956 or the provisions in subsequent product standards. 4.2 Insulation
4.2.1Material
Insulating rubber mixture,
IE1-used for Y series and R series products.
Its mechanical and physical properties are specified in Table 1.
Mechanical and physical properties of insulating rubber
Test items
Tensile strength and elongation at break
Original properties in delivery state
Original value of tensile strength:
-minimum intermediate value
Original value of elongation at break:
-minimum intermediate value
Performance after aging in air oven
Aging conditions:
-temperature
-treatment time
Tensile strength after aging
-minimum intermediate value
Maximum change rate1
Elongation at break after aging
-minimum intermediate value
-maximum change rate1)
Performance after aging in oxygen bomb
Aging conditions:
-temperature||tt| |一treatment time
Tensile strength after aging
Performance requirements
Test method
9.1 of GB/T2951.1-1997
4 of GB5013.2—1997
4 of GB5013.2—1997
Test items
一minimum intermediate value
maximum rate of change1)
Elongation at break after aging
Minimum intermediate value
一maximum rate of change1)
Hot extension test
Aging conditions:
Loading time
Mechanical stress
Test results
Elongation under load, maximum value
Elongation after cooling, maximum value
JB 8735.1—1998
Table 1 (end)
Performance requirements
200±3
1) Rate of change: The ratio of the difference between the median value after aging and the median value before aging to the median value before aging, expressed as a percentage. 4.2.2 Extrusion
Test method
9 of GB/T2951.5—1997
The insulation should be tightly extruded on the conductor or isolation layer, and should be able to be stripped without damaging the insulation, conductor or tinned layer. The insulation surface should be flat and uniform in color.
4.2.3 Thickness
The average value of the insulation thickness should not be less than the specified value of various types and specifications of cables listed in the subsequent product standard table, and the thickness of the thinnest point should not be less than 90% of the specified value~~0.1mm. The thickness measurement result should be rounded to one decimal place in accordance with the provisions of GB8170. 4.2.4 Mechanical properties before and after aging
The insulating rubber should have sufficient mechanical strength and elasticity within the normal operating temperature range. It should be inspected according to the test specified in Table 1 and meet the corresponding requirements. 4.2.5 Identification of insulated cores
Each insulated core should be identified according to the following provisions: - Cables with 5 cores or less should preferably use color identification, and digital identification is also allowed. - Cables with more than 5 cores should preferably use digital identification. 4.2.5.1 Color identification method for insulated cores 4.2.5.1.1 General requirements
The insulated cores of the cable should be identified by colored insulation or other appropriate methods. Except for the yellow/green combination color, each insulated core of the cable should only use one color.
The yellow/green combination color is the color of the grounding core. When there is a yellow/green combination color insulated core in the cable, green and yellow are not allowed for other insulated cores.
4.2.5.1.2 Color spectrum
Preferred color spectrum is:
Single-core cable: no preferred color spectrum;
Two-core cable: no preferred color spectrum:
Three-core cable: yellow/green, light blue, brown, or light blue, black, brown: Four-core cable: yellow/green, light blue, black, brown, or light blue, black, brown, black or brown: 38
JB8735.1—1998
Five-core cable: yellow/green, light blue, black, brown, black or brown, or light blue, black, brown, black or brown, black or brown.
Various colors should be clearly identifiable and resistant to abrasion. They should be tested according to the test method specified in 1.8 of GB5013.2-1997 and should meet the requirements. 4.2.5.1.3 Yellow/green combination color
The color distribution of the yellow/green combination color core should meet the following conditions: For each 15mm long insulated core, one of the colors should cover at least 30% and no more than 70% of the surface of the insulated core, while the other color covers the rest of the insulated core. Note: Explanation on the use of yellow/green combination color and light blue: When the yellow/green combination color is specified as above, it indicates that it is specially used to identify the insulated core connected to the ground or similar protective purpose, while the light blue is used to identify the insulated core connected to the neutral wire. If there is no neutral wire, the light blue can be used to identify any insulated core except the grounding or protective conductor. 4.2.5.2 Digital identification of insulated cores
4.2.5.2.1 General requirements
The insulation of the cores should be the same color and arranged in numerical order, except for the yellow/green combination color cores (if any). If there are yellow/green combination insulated cores, they shall comply with the requirements of 4.2.5.1.3 and shall be placed on the outer layer. The digital numbering shall start from the inner layer 1 and be arranged in a clockwise direction. The numbers shall be printed on the outer surface of the insulated cores in Arabic numerals. The numbers shall be the same color and have a significant color difference with the insulation color. The Arabic numerals must be legible.
4.2.5.2.2 Priority arrangement method of markings
The digital markings shall be repeated at equal intervals along the insulated cores, and two adjacent complete digital markings shall be reversed from each other. When the marking consists of one number, the dash shall be placed below the number. If the marking consists of two numbers, one number shall be placed below the other number, and a dash shall be added below the lower number. The distance d between two adjacent complete digital markings shall not exceed 50mm.
The arrangement of the markings is shown in the figure below:
4.2.5.2.3 Abrasion resistance
The digital markings shall be abrasion resistant and shall meet the requirements according to the test method specified in 1.8 of GB5013.2-1997. 4.3 Filling
4.3.1 Materials
Unless otherwise specified in the subsequent product standards, the filler shall be composed of one or any combination of the following materials: a vulcanized or non-vulcanized rubber mixture
Natural or synthetic textile fibers,
The components of the filler shall not produce harmful interactions with the insulation and (or) sheath. 4.3.2 Covering
The gap between the cabling is allowed to be filled with fillers or sheaths embedded between the insulated cores, which shall be specified by the subsequent product standards. The filler shall fill the space between the insulated cores to form a practical circle. The filler shall not adhere to the insulated cores. It is allowed to use film or tape to tie the cable core and filler together. 4.4 Spun fiber braiding
4.4.1 Material
The yarn used for the spun fiber braiding layer shall comply with the provisions of the subsequent product standards. The braiding yarn can be natural material (cotton yarn, treated cotton yarn, silk 39
JB 8735.1-1998
, etc.), or synthetic material (rayon, polyamide, etc.) or filaments made of glass fiber or equivalent materials. 4.4.2 Covering
The braiding should be uniform, without knots or gaps. In order to prevent the braiding layer made of glass fiber from being damaged, it should be treated with appropriate materials.
4.5 Sheath
4.5.1 Material
Sheath rubber mixture has the following codes:
SE3-for rubber mixture sheathed cable
SE4-for chloroprene rubber mixture or other equivalent synthetic elastomer sheathed cable. Its mechanical and physical properties are specified in Table 2.
Table 2 Mechanical and physical properties of sheath rubber
Test items
Tensile strength and elongation at break
Original properties in delivery state
Original value of tensile strength:
-minimum intermediate value
Original value of elongation at break,
-minimum intermediate value
Performance after aging in air oven
Aging conditions:
-temperature||t t||-treatment time
Tensile strength after aging
-minimum intermediate value
-maximum change rate13
Elongation at break after aging
minimum intermediate value
maximum change rate1
Mechanical properties after immersion in mineral oil
Test conditions:
-immersion time
Tensile strength after immersion in oil
-maximum change rate"||tt ||Elongation at break after oil immersion
Maximum change rate 1
Hot extension test
Test conditions,www.bzxz.net
Expansion
Load time
Mechanical stress
Test results
Elongation under load, maximum value
Performance requirements
10×24
200±3
10×24||tt ||—252
100±2
200±3
Test method
9.2 of GB/T2951.1-1997
8.1.3.1 of GB/T2951.2—1997
and 9.2 of GB/T2951.1—1997
10 of GB/T2951.5—1997
GB/T 2951.5-1997 of 9
Test items
-Elongation after cooling, maximum value
Low-temperature bending test
Test conditions:
-Temperature
-Time of applying low temperature
Test results
Low-temperature tensile test
Test conditions:
-Time of applying low temperature
Test results
-Elongation at break, minimum value
JB 8735.1-1998
Table 2 (end)
Performance requirements
See 2.2.3 in GB/T 2951.4
1997
No crack
—35±2
GB/T 2951. 4
8.4.4 in 1997
No crack
1) Rate of change, the ratio of the difference between the median value after aging and before aging to the median value before aging, expressed as a percentage. 2) No positive deviation is specified
4.5.2 Coating
Test method
8.2 of CB/T2951.4-1997
8.4 of GB/T2951.4-1997
The sheath of each type of cable specified in the subsequent product standards shall be composed of a single layer or double layer (inner layer or sheath and outer layer or sheath). 4.5.2.1 Single-layer sheath
The sheath shall be wrapped in a single layer:
For a single-core cable, it shall be wrapped over the insulating core; For a multi-core cable, it shall be wrapped over the cable core or filler. The sheath of a multi-core cable shall be capable of being stripped without damaging the cable core. A layer of tape or film may be wrapped under the sheath. The sheath is allowed to be embedded in the space between the cable cores to form a filler. 4.5.2.2 Double-layer sheath
The inner sheath shall be extruded as specified in 4.5.2.1. A layer of scraper tape or equivalent tape may be wrapped around the outside of the inner sheath. For tape or insulation layer (if any) not exceeding 0.5 mm in thickness, it may be included in the thickness measurement of the inner sheath, as long as the tape adheres to the inner sheath.
The outer layer or sheath shall be wrapped over the outside of the inner sheath or tape. It may or may not adhere to the inner sheath or tape. If the outer sheath adheres to the inner sheath, it should be clearly distinguishable from the inner sheath; if it does not adhere, it should be easily separated from the inner sheath. 4.5.3 Thickness
The average value of the sheath thickness should not be less than the specified value of each type and specification cable listed in the subsequent product standard table. The thickness of its thinnest point should not be less than 85%~0.1mm of the specified value. The thickness measurement result should be rounded to one decimal place in accordance with the provisions of GB8170. 4.5.4 Mechanical properties before and after aging
The sheath rubber should have sufficient mechanical strength and elasticity within the normal use temperature range. 41
JB 8735. 1—1998
It should be inspected according to the test specified in Table 2 and meet the corresponding requirements. 4.6 Marking
4.6.1 Origin marking and cable identification
The cable should have a continuous mark of the manufacturer's name, product model or the manufacturer's name, product model and rated voltage. The factory name mark can be a mark line or a repeated mark of the manufacturer's name or trademark. The mark can be printed or embossed on the sheath with ink, or printed on the scraper tape or mark isolation tape with ink. 4.6.2 Mark continuity
The distance between the end of a complete mark and the beginning of the next mark: - the sheath should not exceed 500mm;
-the insulation or tape should not exceed 200mm. 4.6.3 Abrasion resistance
The ink-printed mark should be resistant to abrasion. It should meet the requirements when tested according to the test method specified in 1.8 of GB5013.2-1997. 4.6.4 Clarity
All marks should be clear.
The color of the mark identification line should be easy to identify or recognize. If necessary, it can be wiped clean with gasoline or other suitable solvents. 4.6.5 Special requirements for product marking shall be specified by subsequent product labels. 5 Finished cable test
5.1 Electrical performance
The cable should have sufficient dielectric strength and be checked for compliance with the standard requirements according to the tests specified in Table 3. Table 3 Electrical performance of cables
Test items
Conductor resistance measurement
Test results Maximum value
Finished cable voltage test
Test conditions
Minimum length of specimen
Minimum immersion time
Test voltage (AC)
Minimum voltage application time each time
Test results
Insulated core voltage test
Test conditions
Specimen length
Minimum immersion time
-Water temperature
Apply voltage according to the specified insulation thickness
(AC》
-0.6mm and below
-0. 6mm or more
Minimum voltage application time each time
Test results
300/300V
Rated voltage
300/500V
450/750V
See GB/T3956 or subsequent product standards
No breakdown
No breakdown
Test method
2.1 of GB5013.2—1997
2.2 of GB5013.2-1997
2.3 of GB5013.21997
5.2 Dimensions
JB 8735.1—1998
The average outer diameter or overall dimensions of the cable shall comply with the provisions of subsequent product standards. The difference in outer diameter (ovality) between any two points on the same cross section of a circular sheathed cable shall not exceed 15% of the upper limit of the average outer diameter. Measure two points and take the maximum difference.
5.3 Mechanical strength of flexible cable
Flexible cables should be able to withstand bending and other mechanical stresses caused by normal use. When there are provisions in subsequent product standards, they should be inspected according to the prescribed tests and should meet the corresponding requirements. 5.3.1 Flexure test of flexible cables
Test method is in accordance with CB501 3.2-1997 3.1. This test is not carried out for flexible cables with a conductor nominal cross-section exceeding 4mm2 and all single-core cables. During the test, neither current interruption nor short circuit between conductors should occur after 15,000 reciprocating movements, i.e. 30,000 one-way movements.
After the test, the sheath (if any) of cables with 3 or more cores should be stripped off, and then the cable or insulated core should be subjected to a voltage test according to item 3 in Table 3, but the test voltage shall not exceed 2000V. 5.3.2 Abrasion resistance test
The test method shall be in accordance with 3.3. After 20,000 one-way movements, the total length of the exposed insulation of the sample should not exceed 10mm. And carry out voltage test according to item 2 in Table 3.
5.3.3 Heat resistance test of textile braided layer
The test method shall be in accordance with the provisions of 6 in GB5013.2-1997. If the braided layer or any of its components does not melt or carbonize during the test, the test is considered to be qualified. 6
Delivery length
The loop length is 100m, and the coil length should be greater than 100m. Short sections with a length of not less than 10m are allowed to be delivered, but the number should not exceed 10% of the total length of delivery, and the number of short sections in each piece should not exceed 5.
According to the agreement between the two parties, any length is allowed to be delivered. The length measurement error should not exceed ±0.5%. 7 Acceptance rules
Products should be inspected and qualified by the technical inspection department of the manufacturer before they can be shipped, and the shipped products should be accompanied by a product quality inspection certificate. Products shall be inspected and accepted according to the specified tests.
The sampling quantity of the delivery batch shall be stipulated by the agreement between the two parties. If the user does not make any request, it shall be carried out according to the regulations of the manufacturer. If the results of the sampling items are unqualified, the sampling shall be doubled for the second test. If it is still unqualified, 100% inspection shall be carried out. The appearance of the product shall be checked piece by piece with the eyes (normal vision). 8 Marking and packaging
8.1 The coiled or reeled cables shall be wound neatly and properly packaged. The cable reels shall comply with the provisions of JB/T8137. 8.2 Each coil or reel shall be attached with a label indicating: a) Manufacturer name;
b) Model and specification, mm,
c) Rated voltage, V,
d) Length, m (weight, kg)
e) Manufacturing date:
f) This standard number or certification mark;
g) Correct rotation direction of the cable reel.
8.3 When packing, the box shell should be marked with: a) manufacturer's name;
JB 8735. 1
1-1998
b) product model, specification and rated voltage, mm2, V; c) this standard number or certification mark;
d) box size and weight, kg
e) moisture-proof and anti-throw marks.
8.4 The packaging of export products should be carried out in accordance with relevant regulations. 44
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