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Standards Development
The Scope clause is a mandatory element of the text. For rules on the drafting of the Scope, refer to the ISO/IEC Directives, Part 2:2018, Clause 14.This part of IEC 60287 describes a method for calculating the continuous current rating for cables installed in vertically orientated metallic J-tubes or I-tubes on offshore platforms. The method is applicable to armoured 3 core AC cables or single core DC cables, with a restriction of only one cable present in each tube.The method considers both natural convection and forced cooling of the tube (by the presence of wind). The presence of solar heating of the tube can also be accounted for.Longitudinal heat transfer within the cables and the surroundings of the tube is assumed to be negligible. This assumption is appropriate provided that the distance between the hang off (at the top of the tube) and the water level at lowest astronomical tide is 10 m or more.
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