2155 NTERNATIONAL STANDARD ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHA OPTAHW3AUM HO CTAHIAPTW3ALIWW.ORGANISATION INTERNATIONALE DE NORMALISATION Aircraft -- Fire-resisting electrical cables Performance requirements Aeronefs-Cables électriques resistantaufeu-Caracteristiques requises First edition - 1974-02-15 ISO 2155-1974 (E) UDC 629.7.064.5 : 621.315.211 Ref.No.1SO2155-1974 (E) Descriptors : aircraft equipment, electrical cables, fire resistant equipment, specifications. E'eqr[tkijvgf'd"WPG.'E" Price based on 3 pages renniravint:Inf FOREWORD ISO (the International Organization for Standardization) is a woridwide 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 Technicai Committee has been set up has the right to be represented on that Committee. International organizations, governmental andnon-governmental,in liaisonwithIsO,aisotakepart inthework. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approvai before their acceptance as International StandardsbytheiSOCouncil. International Standard IS02155 wasdrawnupbyTechnical Committee ISO/TC 20, Aircraft and space vehicies, and circulated to the Member Bodies in January1971. it has been approved by the Member Bodies of the foliowing countries : Austria India South Africa, Rep.of Belgium Israel Spain Czechoslovakia Italy Thailand Egypt, Arab Rep. of Japan Turkey France Netherlands United Kingdom Germany New Zealand U.S.A. Greece Romania No Member Body expressed disapproval of the document. International Organization for Standardization, 1974 . Printed in Switzerland E"eqr(tkijvgf'd"WPG.Egpgxc."8r4:226"Ocftf.Urckp"cm"tkijw"tgugtxgf+Ygf"Hgd36323957WVE'4246 PranintiInf INTERNATIONAL STANDARD ISO2155-1974 (E) Aircraft - Fire-resisting electrical cables - Performance reguirements 1 SCOPEANDFIELDOFAPPLICATION 3.5 insulation : Part of a cable which serves to insulate the conductor. This International Standard gives the performance requirements for fire-resisting electrical cables for the 3.6 primary insulation : Concentric layers of insulation wiringof aircraft circuits, comprising single conductors with copper core covered with nickel or any other material of applied over the conductor. equivalent properties, suitable for use at a rated voltage up 3.7 protective sheath; protective covering : Covering providedfor the cable,whichis applied over theprimary The cables are intendedfor use at atemperaturewhich may insulation,to ensure itsprotectionagainstdeteriorationdue reach 28o °c in continuous service (ambient temperature to friction caused by a foreign body or to contact with a plus heating) and 400 °c for a limited period. fluid. They retain a certain dielectric strength when subjected to a 3.8 metal braid : A number of wires applied spirally over flame of 1 100°c for 5 min and are suitable for fixed the insulation and interwoven to form a uniform and wiring the temperature of which may fall to -75 °c. substantialy continuous covering. 3.9 cable : Complete assembly of conductor, insulation and metal braid. 2 REFERENCES ISO 1967, Aircraft - Fire-resisting electrical cables -- Di- 3.10 sample : Amount of cable of one and the same mensions,conductorresistanceandmass. dimension and type,taken from a batch. IsO 2156, Aircraft - Fire-resisting electrical cables -- 3.11 test piece : Continuous length of cable taken from a Methods of test. sample. ISO 2574, Aircraft -- Electrical cables - Identification.1) 4 DESCRIPTIONOFTHEPRODUCT 3 TERMINOLOGY 4.1 Conductor 4.1.1Material 3.1 conductor : Conducting portion of a cable. Thewires used for themanufacture of conductors shall be cylindrical, and made of electrolytic copper covered with 3.2 wire : Cylindrical metallic wire of uniform nickel or any other material of equivalent properties. cross-section, used