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Rating Conversion Factors for Installation of Medium Voltage Power Cables, 6-30 kV
for Installation in air - Multi Conductor Cables & Single Conductor Direct Current Cable

Arrangem. of cable in laying condition No. of cable troughs
or trays 		For installation on plain surface
Space = cable diameter d
Distance from wall ≥ 2 cm
Installation method Number of cables
1 2 3 4 6
On the ground 1 installation on the ground .97 .96 .94 .93 .90
On non-perforated cable troughs (restricted air circulation) 1 installation on non-perforated cable troughs (restricted air circulation) .97 .96 .94 .93 .90
2 .97 .95 .92 .90 .86
3 .97 .94 .91 .89 .84
6 .97 .93 .90 .88 .83
On perforated cable troughs 1 installation on perforated cable troughs 1.0 1.0 .98 .95 .91
2 1.0 .99 .96 .92 .87
3 1.0 .98 .95 .91 .85
6 1.0 .97 .94 .90 .84
On cable trays or cable ladders (unrestr. air circulation) 1 installation on cable trays or cable ladders (unrestricted air circulation) 1.0 1.0 1.0 1.0 1.0
2 1.0 .99 .98 .97 .96
3 1.0 .94 .97 .96 .93
6 1.0 .97 .96 .94 .91
On platform, walls or perforated cable tray 1 installation on platform, walls or perforated cable tray 1.0 .91 .89 .88 .87
2 1.0 .91 .88 .87 .85
On platform or walls - - -
Arrangements for which a reduction is not necessary1) Number of cables arranged one over another is optional Arrangements for which a reduction is not necessary
For installation on plain surface
Space = 2 x cable diameter d
Distance from wall ≥ 2 cm
Installation method Number of cables
1 2 3 4 6 9
installation on the ground .97 .85 .78 .75 .71 .68
installation on non-perforated cable troughs (restricted air circulation) .97 .85 .78 .75 .71 .68
.97 .84 .76 .73 .68 .63
.97 .83 .75 .72 .66 .61
.97 .81 .73 .69 .63 .58
installation on perforated cable troughs 1.0 .88 .82 .79 .76 .73
1.0 .87 .80 .77 .73 .68
1.0 .86 .79 .76 .71 .66
1.0 .84 .77 .73 .68 .64
installation on cable trays or cable ladders (unrestricted air circulation) 1.0 .87 .82 .80 .79 .78
1.0 .86 .80 .78 .76 .73
1.0 .85 .79 .76 .73 .70
1.0 .83 .76 .73 .69 .66
installation on platform, walls or perforated cable tray 1.0 .88 .82 .78 .73 .72
1.0 .88 .81 .76 .71 .70
installation on platform or walls .95 .78 .73 .72 .68 .66
Number of cables arranged side-by-side is optional Arrangements for which a reduction is not necessary
1) In narrow rooms for bigger grouping the air temperature is increased due to energy losses of the cable, so the additional conversion factors for deviating air temperatures can be found in the given table.
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