JB/T 8734.3-2012 English PDF (JB/T8734.3-2012)

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JB/T 8734.3-2012: Polyvinyl chloride insulated cables and wires and cords of rated voltages up to and including 450/750 V. Part 3: Cords and cables for connecting
JB/T 8734.3-2012
JB
MACHINERY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.20
K 13
Record No. 36478-2012
Replacing JB/T 8734.3-1998
Polyvinyl chloride insulated cables and wires and
cords of rated voltages up to and including 450/750 V
- Part 3. Cords and cables for connecting
ISSUED ON. MAY 24, 2012
IMPLEMENTED ON. NOVEMBER 1, 2012
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Use characteristics ... 6 
4 Models ... 6 
5 Specifications ... 6 
6 Technical requirements ... 7 
6.1 General ... 7 
6.2 Conductor ... 7 
6.3 Insulation ... 7 
6.4 Insulated core twisting ... 11 
6.5 Sheathing ... 11 
6.6 Outer diameter ... 11 
7 Inspection ... 12 
Foreword
JB/T 8734 Polyvinyl chloride insulated cables and wires and cords of rated
voltages up to and including 450/750 V consists of the following 6 parts.
- Part 1. General requirements;
- Part 2. Insulated cables and wires for fixed wiring;
- Part 3. Cords and cables for connecting;
- Part 4. Insulated wires for internal wiring of equipment;
- Part 5. Screened wires;
- Part 6. Lift cables.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces JB/T 8734.3-1998 Polyvinyl chloride insulated cables and
wires and cords of rated voltages up to and including 450/750V - Part 3 . Cords
for connecting. Compared with JB/T 8734.3-1998, the main technical changes
are as follows.
- modified the name from “Cords for connecting” to “Cords and cables for
connecting”;
- added relevant content of rated voltage Uo/U is 300/500 V;
- modified clause name and relevant reference standards in normative
references (see Clause 2 of this edition, Clause 2 of 1998 edition);
- added RVB and RVV cables (see Table 1);
- added general properties of RVB and RVV cables (see Table 4 and Table
5);
- added RVS cable specifications and corresponding technical
requirements (see Table 2 and Table 3);
- added flexing test and insulated core peel-off test (see Clause 7);
- added provisions on flexing test weight of hammer and pulley diameter
(see Table 6).
This Part was proposed by China Machinery Industry Federation.
Polyvinyl chloride insulated cables and wires and
cords of rated voltages up to and including 450/750 V
- Part 3. Cords and cables for connecting
1 Scope
This Part of JB/T 8734 specifies use characteristics, models, specifications,
technical requirements and inspection of cords and cables for connecting.
This Part is only applicable to PVC insulated copper cords and cables for
connecting of electrical appliance, instruments and dynamic lighting of which
the AC rated voltage Uo/U is 300/500 V and less.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 2951.11-2008 Common test methods for insulating and sheathing
materials of electric and optical cables - Part 11. Methods for general
application - Measurement of thickness and overall dimensions
GB/T 2951.12-2008 Common test methods for insulating and sheathing
materials of electric and optical cables - Part 12. Methods for general
application - Thermal ageing methods
GB/T 2951.14-2008 Common test methods for insulating and sheathing
materials of electric and optical cables - Part 14. Methods for general
application - Test at low temperature
GB/T 2951.31-2008 Common test methods for insulating and sheathing
materials of electric and optical cables - Part 31. Methods specific to PVC
compounds - Pressure test at high temperature - Test for resistance to
cracking
GB/T 2951.32-2008 Common test methods for insulating and sheathing
materials of electric and optical cables - Part 32. Methods specific to PVC
compounds - Loss of mass test - Thermal stability test
6 Technical requirements
6.1 General
In addition to the technical requirements specified in this Part, the cords and
cables shall also comply with the provisions of JB/T 8734.1-2012.
6.2 Conductor
The number of cores and structure of conductor shall comply with the provisions
of Table 3 and Table 5.
RVB cord conductor shall use the 6th soft copper conductor specified in GB/T
3956-2008.
RVV cable conductor shall use the 5th soft copper conductor specified in GB/T
3956-2008. The maximum conductor resistance value of copper core conductor
of which the nominal cross-sectional area is 2.0 mm2 at 20°C is 9.79 Ω/km. The
maximum conductor resistance value of tinned copper core conductor of which
the nominal cross-sectional area is 2.0 mm2 at 20°C is 10.2 Ω/km.
6.3 Insulation
The insulation of extrusion on conductor should be PVC blend of which the code
is PVC/D.
The insulation thickness shall comply with the provisions in Table 3 ~ Table 5.
The insulation resistance shall not be less than the predetermined values in
Table 3 ~ Table 5.
Table 5 (continued)
6.4 Insulated core twisting
6.4.1 Insulated cores of RVS cords shall be twisted together. RVS cable
should be twisted to the right and the pitch shall not exceed 8 times the average
outer diameter upper limit.
6.4.2 RVB cord conductor shall be placed parallel with extruded insulation.
There should be a groove at the insulation sides between conductors, so as to
isolate the insulated cores.
6.4.3 For RVV cables, insulated cores with or without same nominal cross-
sectional area can be twisted together.
6.5 Sheathing
The sheathing extruded on insulation or stranding core should be PVC blend of
which the code is PVC/ST5.
The sheathing thickness shall comply with the provisions in Table 5.
The sheathing is allowed to fill the gap between insulated cores so as to form
the filling. But the sheathing does not stick to the insulated core.
6.6 Outer diameter
The average outer diameter of cord or cable shall comply with the provisions in
Table 3 ~ Table 5.
The number of
cores × nominal
cross-sectional
area mm2
Predetermined
value of
insulation
thickness mm
Predetermined
value of sheathing
thickness mm
Average shape size mm
Lower limit Upper limit
The minimum
resistance value of
conductor at 70°C
NOTE. Cable structure of other number of cores or more is allowed to use.