PVC soft cable use conditions: 1, cable conductor long-term allowable maximum operating temperature of 70 °C; 2, the minimum ambient temperature when the cable is laid is 0 °C; 3, the cable allows bending radius: non-armored cable is not less than the cable diameter 8 times; armored cable is not less than 20 times the cable diameter; 4, when the short circuit (maximum duration does not exceed 5S), the maximum working temperature of the cable conductor is 160 °C;
Nominal section mm2
1.5
2.5
4
6
10
16
25
35
50
Conductor Maximum DC Resistance Ω/km at 20°C
13.3
7.98
4.91
3.3
1.91
1.21
0.78
0.554
0.389
Nominal section mm2
70
95
120
150
185
240
300
400
Conductor Maximum DC Resistance Ω/km at 20°C
0.272
0.206
0.161
0.129
0.106
0.0801
0.0641
0.0495
2. Minimum insulation resistance at 70°C:
Nominal section mm2
Minimum insulation resistance MΩ.km at 70°C
1.5
0.01
2.5
0.009
4
0.007
6
0.006
10
0.0056
16
0.0046
25
0.0044
35
0.0038
50
0.0037
70
0.0032
95
0.0032
120
0.0029
150
0.0029
185
0.0029
240
0.0028
300
0.0028
400
0.0026
3, industrial frequency AC withstand voltage test finished cable should withstand the following table specified AC 50Hz withstand voltage test should not breakdown:
Number of cable cores
experiment method
Sample length m
Voltage V
duration
Manufacturing length
Rated voltage
Test voltage
5min
Single core
Soaking 1h
450/750
2500
Multi-core and armored
Interphase
600/1000
3500
Main technical parameters of RVV flexible cable: The maximum DC resistance of the conductor at 1,20°C should meet the following requirements:
Approximate outer diameter and current-carrying capacity of PVC soft cable: compared with ordinary PVC insulated PVC sheathed power cable of the same specification, the outer diameter of the cable is generally increased: the conductor cross section is 95mm2 or less, and the outer diameter increases by 2~ 10mm; conductor cross section is 120mm2 and above, outside diameter increases 12~20mm; cable weight generally increases 4%~10%. The allowable ampacity of soft power cables can be reduced by 6% to 10% with reference to the current carrying capacity of VV series power cables of the same specification.
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