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Conversion Factors for Medium Voltage Power Cables, 6-30 kV

Load rating for cables laid in ground
Load factor 0.7 and 1.0

Fundamental conditions*
Ground temperature  
Thermal resistivity  
Distance between cables or systems  
Single conductor cables laid in triangular touching arrangement

Load factor 0.7
Type of insulation Cable design Nominal voltage Number of cables or systems
2 4 6 8 10
PVC Multi conductor cables 0.6/1 to  3.6/6 kV 0.86 0.71 0.64 0.60 0.57
3-conductor cables to   6/10 kV 0.87 0.71 0.63 0.59 0.54
Single conductor cables 0.6/1 to  3.6/6 kV 0.85 0.70 0.63 0.59 0.56
Single conductor cables to   6/10 kV 0.83 0.66 0.57 0.53 0.49
VPE Multi conductor cables 0.6/1 to 18/30 kV 0.85 0.70 0.63 0.59 0.56
3-conductor cables 0.6/1 to 18/30 kV 0.85 0.70 0.63 0.58 0.56


Load factor 1.0
Type of insulation Cable design Nominal voltage Number of cables or systems
1 2 4 6 8 10
PVC Multi conductor cables 0.6/1 to  3.6/6 kV 0.81 0.66 0.52 0.46

0.43

0.40
3-conductor cables to   6/10 kV 0.82 0.67 0.51 0.45 0.41 0.37
Single conductor cables 0.6/1 to  3.6/6 kV 0.79 0.65 0.51 0.46 0.42

0.40

Single conductor cables to   6/10 kV 0.78 0.62 0.47 0.40 0.36 0.33
VPE Multi conductor cables 0.6/1 to 18/30 kV 0.83 0.67 0.53 0.47 0.44

0.41

3-conductor cables 0.6/1 to 18/30 kV 0.81 0.66 0.52 0.47 0.43

0.41


Built-up of system:
for single conducors: for single conducors for multi conductor cables: for multi conductor cables

Conversion factors for multi conductor cables (≤ 5 conductors), Conductor cross-section from 1.5 to 10 mm²
Number of loaded conductors Conversion factors for the values of 1.5 to 10 mm²
Ground Air
5 0.7 0.75
7 0.6 0.65
10 0.5 0.55
14 0.45 0.5
19 0.4 0.45
24 0.35 0.4
40 0.3 0.35
61 0.25 0.3

* For other conditions e.g. ground temperature, grouping, load factor, thermal resistance, the rating factors should be calculated according to DIN VDE 0276 part 1000.
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Sealcon is the Exclusive Importer of HUMMEL products. We offer over 6,000 different Types and Sizes of RoHS Compliant Liquid Tight Strain Relief Fittings, Cord Grips, Cable Glands, Circular Connectors, Conduit System, Industrial Enclosures and Other Related Cable Management Products which are rated the best in the industry.
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