IEC 60287-3-3:2007 Electric cables - Calculation of the current rating - Part 3-3: Sections on operating conditions - Cables crossing external heat sources
This part of IEC 60287 describes a method for calculating the continuous current rating factor
for cables of all voltages where crossings of external heat sources are involved. The method
is applicable to any type of cable.
The method assumes that the entire region surrounding a cable, or cables, has uniform
thermal characteristics and that the principle of superposition applies. The principle of
superposition does not strictly apply to touching cables and hence the calculation method set
out in this standard will produce an optimistic result if applied to touching cables.
IEC 60287-3-3:2007 history
2007IEC 60287-3-3:2007 Electric cables - Calculation of the current rating - Part 3-3: Sections on operating conditions - Cables crossing external heat sources