IEC_60287-2-2-1995_scan.pdf

287-2-2IEC:1995-5-INTERNATIONAL ELECTROTECHNICAL COMMISSIONELECTRIC CABLES-CALCULATION OF THE CURRENT RATING-Part2 Thermal resistanceSection 2:A method for calculating reduction factorsfor groups of cables In free air,protectedfrom solar radiationFOREWORDI)The IEC(International Electrotechnical Commission)is a worldwide organization for standardizationcomprising all national electrotechnical committees(IEC National Committees).The object of the IEC is topromote international cooperation on all questions concerning standardization in the electrical andelectronic fields.To this end and in addition to other activities,the IEC publishes Intemational Standards.Their preparation is entrusted to technical committees;any IEC National Committee interested inthe subject dealt with may participate in this preparatory work.International,governmental andnon-governmental organizations llaising with the IEC also participate in this preparation.The IECcollaborates closely with the Intemational Organization for Standardization.(ISO)in accordance withconditions determined by agreement between the two organizations2)The formal decisions or agreements of the IEC on technical matters,prepared by technical committees onwhich all the National Committees having a special interest therein are represented,express,as nearly aspossible,an international consensus of opinion on the subjects dealt with3)They have the form of recommendations for international use published in the form of standards,technicalreports or guides and they are accepted by the National Committees in that sense4)In order to promote international unification,IEC Natlonal Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards.Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.International Standard IEC 287-2-2 has been prepared by sub-committee 20A:High-voltage cables,of IEC technical committee 20:Electric cables.The text of this standard is based on the following documents:Six months RuleReport on voting20A(CO)12520A(CO)135Full information on the voting for the approval of this standard can be found in the reporton voting indicated in the above table.This section was published initially as IEC 1042.