2156 NTERNATIONAL STANDARD TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION -MEXIYHAPOIHA OPTAHI3ALIMH HIO CTAHIAPTH3ALIWIH·ORGANISATION INTERNATIONALE DE NORMALISATION Aircraft -- Fire-resisting electrical cables -- Methods of test Aéronefs -- Cables électriques resistant au feu -- Méthodes d'essai First edition - 1974-02-01 SO 2156-1974 (E) UDC 629.7.064.5 : 621.315.32 : 620.1 Ref. No. 1SO 2156-1974 (E) Descriptors : aircraft equipment, electrical cables, fire resistant equipment, tests Price based on 7 pages Not for Resale FOREWORD IsO (the International Organization for Standardization) is a worldwide federation of national standards institutes (isO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set governmental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the IsO Council. Standard ISO 2156 was drawn up by Technical Committee International ISO/TC 20, Aircraft and space vehicles, and circulated to the Member Bodies in February 1971. It has been approved by the Member Bodies of the following countries : Austria Germany South Africa, Rep. of Belgium Israet Spain Brazil Italy Thailand Turkey Czechoslovakia Japan Netheriands United Kingdom Egypt, Arab Rep. of U.S.A. France New Zealand No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1974 PrintedinSwitzerland Copyright International Organization for Standardization IHS und Not for Resale ted without license from IHS ISO 2156-1974 (E) INTERNATIONAL STANDARD Aircraft -- Fire-resisting electrical cables -- Methods of test 1 SCOPE AND FIELD OF APPLICATION The edge of the square-shaped knife shall have a radius very close to 0,40 mm (1/64 in) which shall be checked This International Standard specifies the tests suitable for regularty. establishing the compliance of fire-resisting electrical cables for aircraft with the performance requirements stated in The test piece is arranged on the support of the apparatus ISO 2155. in such a way that the knife blade is perpendicular to the axis of the cable. This International Standard is intended to serve as a basis for test specifications to be included in the relevant 3.2 The test shall be begun after the assembly of apparatus national standards when the Official Board of Inspection and test piece has been stabilized for at least 1 h at considers that existing tests are inadequate. 260 ± 5 °c. Weights shall then be placed on the end of the The tests are classified as follows : beam at a minimum rate of 700 g/min (1.5 Ib/min) until the core is perforated. This operation shall not last more 1 Type tests only than 1 min. 11 Type tests and routine production tests The test shall be carried out six times, and after each test the test piece shall be advanced 75 mm (3 in), always being II Type tests and production quality tests turned in the same direction. The minimum force to be applied to the cable so that the knife reaches the core shall be specified in the relevant national standard. 2 REFERENCES IsO 1967. Aircraft - Fire-resisting electrical cables - Dimensions, conductor resistance and mass. 4 AGEING TEST FOLLOWED BY AN INSULATION ISO 2155, Aircraft -- Fire-resisting electrical cables - TEST WHILE IMMERSED IN WATER Performance requirements. 4.1 Two samples of cable shall be bent into U-loops, each IsO .., Aircraft - Electrical cables - Fire resistance test. 1) having a maximum diameter equal to ten times the diameter of the cables for sizes No. 22 to No. 10 and fifteen times the diameter of the cables for size No. 8 and larger I TYPE TESTS ONLY The samples shalt then be piaced in an oven, with hot air renewed by natural draught, for 168 h at a t