Conversion factors for deviating ambient temperature, grouping, installation under the ceiling, multi conductor cables and insulated wires - see DIN VDE 0298 part 4.
1)
When a bunched installation with single or multi conductors are used on floor the conversion factors for the rating values should be considered
factor 0.76 for one-phase A.C. and direct current circuits or
factor 0.67 for three-phase circuits, is to be multiplied
When a bunched installation with single or multi conductors are used in open air or in cable trays, the conversion factors for the rating values should be considered
factor 0.8 for one-phase A.C. and direct current circuits or
factor 0.7 for three-phase circuits, is to be multiplied
When a bunched installation with single or multi conductors are used in insulating tubes or conduit, the conversion factors for the rating values should be considered
factor 0.61 for one-phase A.C. and direct current circuits or
factor 0.54 for three-phase circuits, is to be multiplied
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