BS IEC 60287-3-3 is a British Standard for electric cables crossing external heat sources.
BS IEC 60287-3-3 is a part of IEC 60287 which 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.
BS IEC 60287-3-3 provides method 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 BS IEC 60287-3-3 will produce an optimistic result if applied to touching cables.
BS IEC 60287-3-3 on electric cables is useful for:
BS IEC 60287-3-3 provides guidelines to manufacturers on how to estimate the reduction of the permissible current-carrying capacity of a cable crossed by heat sources based on the actual requirements necessary for adequate performance in that application.
When these electric cables are handled according to the standards provided in BS IEC 60287-3-3, it ensures smooth workflow and safety.
IEC 60287-3-3:2007