This standard specifies the models, specifications, technical requirements and inspections of cables and wires for fixed wiring. This standard applies to copper core or aluminum core polyvinyl chloride insulated cables and wires for fixed wiring of power plants with AC rated voltage Uo/U of 450/750V and below. In addition to meeting the technical requirements specified in this standard, cables and wires shall also meet the requirements of JB 8734.1. JB 8734.2-1998 Polyvinyl chloride insulated cables, wires and cords with rated voltages of 450/750V and below Part 2: Cables and wires for fixed wiring JB8734.2-1998 Standard download decompression password: www.bzxz.net

JB8734.18734.51998
This standard is a supplement to GB5023.15023.7-1997 "Polyvinyl chloride insulated cables with rated voltages of 450/750V and below". The products covered by this standard were originally specified in GB5023.1~5023.3-85 and GB5023.4~5023.5-86, but GB5023.1~5023.3-85 and GB5023.4~5203.5-86 have been revised. The revised GB5023.1~5023.7-1997 is equivalent to using Parts 1 to 7 of the IEC227 standard. Therefore, some products have not been included despite the demand for export trade in the domestic market. The main technical parameters, basic test conditions and performance indicators of the products in this standard are consistent with the provisions of GB5023.1~5023.7--1997. www.bzxz.net
This standard is proposed and managed by the National Wire and Cable Standardization Technical Committee. The drafting unit of this standard is Shanghai Electric Relay Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Wu Zengquan and Zhu Cuizhen. 1 Scope
Machinery Industry Standard of the People's Republic of China
Rated voltage 450/750V and below
Polyvinyl chloride insulated cables and wires and flexible cords
Part 2: Cables and wires for fixed wiring
Polyvinyl chloride fasulated cables and wires aad cordsof rated voltages up to and ineluding 450/750 yPart 2, Insulated cables and wires for fixed wiring This standard specifies the models, specifications, technical requirements and inspections of cables and wires for fixed wiring. JB 8734. 2—1998
This standard applies to copper core or aluminum core polyvinyl chloride insulated cables and wires for fixed wiring of power units with AC rated voltage U./U of 450/750V and below.
In addition to meeting the technical requirements of this standard, cables and wires shall also meet the requirements of JB8734.1. 2 Referenced standards
The following standards contain provisions that constitute the provisions of this standard through reference in this standard. When the standard is published, 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. GB/T29511997
GB 5023.2—1997
GB 12666.2—1990
JB 8734.1—1998
3 Usage characteristics
General test methods for cable insulation and sheath materials Polyvinyl chloride insulated cables with rated voltages up to and including 450/750V Part 2: Test methods Burning test methods for wires and cables Part 2: Vertical burning test methods for single wires and cables Polyvinyl chloride insulated cables with rated voltages up to and including 450/750V Wires and cords Part 1: General provisions
3.1 The rated voltage U of the cable is 450/750V and 300/500V. 3.2 The long-term allowable operating temperature of all types of cables shall not exceed 70℃. 3.3 The laying temperature of the cable should not be lower than 0℃. The allowable bending radius of the cable with an outer diameter (D) less than 25mm should not be less than 4D. The allowable bending radius of the cable with an outer diameter (D) of 25mm and above should not be less than 6D. 4 Model
The cable model is shown in Table 1
Approved by the Ministry of Machinery Industry on May 28, 1998
Implementation on November 1, 1998
S Specifications
Pot-core polyoxyethylene insulated wire
Aluminum core polyoxyethylene insulated cable
Copper core polyvinyl chloride insulated flexible cable
JB 8734.2—1998
Model and name
Copper core polyvinyl chloride insulated polyvinyl chloride sheathed round cable Aluminum core polyvinyl chloride insulated polyoxyethylene sheathed round cable Copper core polyvinyl chloride insulated polyvinyl chloride sheathed flat cable Aluminum core polyvinyl chloride insulated polyvinyl chloride sheathed flat electric cable The specifications are shown in Table 2.
Table 2 Specifications
Technical requirements
6.1 Conductor
Rated voltage
300/500
450/750
450/750
300/500
300/500
300/500
The number and structure of conductor cores shall comply with the provisions of Tables 3 to 7. 6.2 Insulation
Fixed wiring
Fixed wiring
Main purpose
Situations requiring flexibility when fixing wiring
Fixed wiring
Fixed wiring
Fixed wiring
Fixed wiring
Nominal cross section
The insulation extruded on the conductor shall be a polyvinyl chloride mixture with the code PVC/C. The insulation thickness shall comply with the provisions of Tables 3 to 7. The insulation resistance shall not be less than the specified values ​​in Tables 3 to 7. 6.3 Insulated core laying cabling
The insulated cores of flat cables shall be placed in parallel. 6.4 Sheath
The sheath extruded on the insulation or cabled core shall be a polyvinyl chloride mixture with the code PVC/ST4. The sheath thickness shall comply with the provisions of Tables 6 and 7. The sheath is allowed to fill the gaps between the insulated cores to form a filling, but it shall not adhere to the insulated cores. 6.5 Overall dimensions
The average outer diameter of circular relays and the average overall dimensions of fan-shaped cables shall comply with the provisions of Tables 3 to 7. 7 Inspection
Product inspection items, test types and test methods shall comply with the provisions of Table 8. 14
Structural data Table number
Nominal cross section of conductor
Nominal cross section of conductor
Nominal cross section of conductor
JB 8734. 2—1998
Table 3BV type 300/500V copper core PVC insulated wire in stranded conductor
Minimum number of single wires
Insulation thickness
Specified value
Average outer diameter
Maximum conductor resistance at 20℃
Tinned copper core
BLV type 450/750V aluminum core PVC insulated cableTable 4
Solid conductor or
Stranded conductor
Minimum number of single wires
Specified value of insulation thickness
Upper limit of average outer diameter||t t||Conductor resistance at 20℃
Maximum value
In stranded conductor of 5BVR type 450/750V copper core PVC insulated flexible cable
Minimum number of single wires
Insulation thickness
Specified value
Average outer diameter
Maximum value of conductor resistance at 20℃
Tinned copper core
Insulation resistance at 70℃
Minimum value
Insulation resistance at 70℃
Minimum value
Insulation resistance at 70℃
Minimum value
JB 8734.21998
Table 6BVV, BLVV type 300/500V copper core and aluminum core PVC insulated PVC sheathed round cable solid conductor
Nominal cutting area
or stranded conductor
single wire in the body
minimum number of roots
insulation thickness
specified value
sheath thickness
specified value
average outer diameter
conductor resistance at 20c
maximum value
tinned copper core
Minimum value of insulation resistance at 70℃
Table 7 Number of cores of BVVB, BLVVB type 300/500V copper core and aluminum core PVC insulated PVC sheathed flat cable×
Nominal cross section
Minimum number of single wires in solid conductor or stranded conductor
Insulation thickness
Specified value
Sheath thickness
Specified value
Average overall dimensions
3. 9× 6. 1
6. 2×10. 4
6.4×10.8
E 7.9×13.4
5.8×13.1
6. 4×15.1
1 7. 9 7×11.1
6.9×11.5
4.8×10.1
5.3×11.7
6.2×14.0
7.0×15.8
7. 1×16.3
7.8×18.2
9.5×23.0
Maximum value of conductor resistance at 20°C
Tinned copper core
Insulation
Minimum value of resistance at 70°C
Inspection items
Electrical performance test
Conductor resistance
2500V voltage test for finished cable
2000V voltage test for finished cable
2000V voltage test for insulated core
Insulation resistance at 70°C
Structural dimension inspection
Structural inspection
Insulation thickness
Sheath thickness
Outer diameter or shape Size
Ovality
Insulation mechanical properties
Tensile test before aging
Tensile test after aging
Weight loss test
Sheath mechanical properties
Tensile test before aging
Tensile test after aging
Weight loss test
High temperature pressure test
Low temperature elasticity and impact strength
Low temperature bending test for insulation
Low temperature tensile test for insulation
Low temperature bending test for sheath
Low temperature impact test for finished cable
Thermal shock test
Non-flame retardation test
Marking abrasion resistance test
JB 8734.2—1998
Table 8 Test
300/500450/750
300/500
300/500
Test method
2.1 of GB 5023.2--1997
GB 5023.2—1997, 2.2
GB5023.2—1997, 2.2
GB5023.2-1997, 2.3
GB5023.2—1997, 2.4
Normal visual inspection
GB5023.2—1997, 1.9
GB5023.2—1997, 1.10
CB5023.2—1997, 1.11
GB 5023.2—1997, 1.11
GB/T2951.1-1997, 9.1
GB/T2951.2-1997, 8.1.3.1 and
GB/T 9.1 of GB/T 2951.1—1997
8.2 of GB/T 2951.7—1997
8.1.3.1 of GB/T 2951.1—1997
8.2 of GB/T 2951.7—1997
8.1 of GB/T 2951.6—1997
8.2 of GB/T 2951.6—1997
GB/T 2951.4—1997 8.1 of GB/T2951.4—8.3 of 1997
GB/T 2951. 4—8. 2 of 1997
GB/T2951.6—8.5 of 1997
GB/T 2951.6—9. 1 of 1997
GB/T 2951. 6—9. 2 of 1997
GB 12666. 2
GB 5023. 2—1.8 of 1997
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