– For favourable ground conditions with thermal resisted bedding materials, lower value under well consolidation
can achieved.
– For outdoor installation air, the ambient temperature based 30° C.
– using the cable channels cable board underlays etc.
– Laying depth 0,7 The load capacity decreases with increasing the laying depth.
The heat depends the inner heat-resistance between conductor and outer surface the cable and
as well from the heat emission the surroundings.
– normal value the speci ground thermal resistivity moist areas selected with 1,0 m/W For dry areas
the choiced value 2,5 m/W, under consideration the applied usual bedding materials sands.
The following recommended values are the current carrying capacity cables for laying earth and air normal
operating conditions. For individual case, the values and upon that the resulted current carrying loads are be
determined. The conversion factors for the load grades 0,5, 0,6, 0,85
and 1,0 are taken tables DIN VDE 0276 part 603 and part 1000. the air temperature will increased.
● Distance between the cable from the wall, oor ceiling cm
● Distance between the cables being laid one above the other D
● Distance between the cable systems being laid one above the other cm
● Distance between the cables being laid side side D
● 6SHFLęFJURXQGWKHUPDOUHVLVWLYLW\
– very moist area 0,7 m/W
– moist area 1,0 m/W
– dry area 2,0 m/W
– very dry area 3,0 m/W
CURRENT CARRYING CAPACITY AND INDICATIONS
FOR CALCULATION POWER CABLES AND WIRES
. Usual depth laying
is 0,7 1,2 m. Hints for the deviated operating conditions, see DIN VDE 0298 table and
DIN VDE 0276 part 603 and part 1000.
– The arrangement the cables corresponded the presentation table DIN VDE 0276 part 1000.
– EVU-load (load grade) the maximum load factor 0,7. Intermediate values can
be interpolate (1,0 used for permanent load).
● Radiation heats and solar uence must taken into consideration, where good air circulation needed.
Indications for Calculation
● For laying earth
– Deviating operating conditions with both conversion factors are considered, these depend both of
speci heat-resistance and the grade load.
● suf cient large distance retain between the cables and the heating elements, because badly insulated heat-
ing elements often raise additionally the temperature the cable.
– Conversion factors for other laying conditions and the heaping cables are shown table and 11,
DIN VDE 0276 part 1000.
● For laying air
– The values stated the tables for outdoor laying the air are ned for permanent operation.
– The current carrying capacities multi-core cables can calculated using the current load value for
3-core cables according table with help the conversion factors.
The current carrying capacity cable should limited such degree that all locations cable system which
causes the generated heats under given proportions lead safely the environment.1063
Y
The guidelines for current carrying capacities copper and aluminium are valid DIN VDE 0298 part well as
DIN VDE 0276 part 603 and for the conversion factors DIN VDE 0276 part 1000. this case the
conversion factors according table for deviating air temperature should used
