TSO 1548 NTERNATIONAL STANDARD INTERNATIONAL GIRGANIZATION FOR STANDARDIZATION·ME I>HAPOAHAR OPIAHM3AIMA O CTAHIAPTM3ALIWM.ORGANISATION INTERNATIONALE DE NORMALISATION Aircraft - Precision fuse-links -- Type A Aeronefs - Porte-fusible de precision - Type A First edition -- 1976-03-15 SO 1548-1976 (E) Ref. No. ISO 1548-1976 (E) UDC 629.7.064.5 : 621.316.923.1 Descriptors : aircraft equipment, electric fuses, fuse-links, precision equipment, specifications, dimensions, ratings, tests. Price based on 20 pages CopyrightInternational Organization for Standardizatin IHS 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 up has the right to be represented on that Committee. International organizations, 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. Prior to 1972, the resuits of the work of the Technica! Committees were published as isO Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, Technical Committee ISO/TC 20 has reviewed ISO Recommendation R 1548 and found it technically suitable for transformation. International Standard ISO 1548 therefore ISO following countries : Australia Israel Switzerland Belgium Thailand Italy Canada New Zealand Turkey Czechoslovakia Peru United Kingdom Egypt. Arab Rep. of South Africa, Rep. of Greece Spain The Member Bodies of the following countries expressed disapproval of the Recommendation on technical grounds : Germany Netherlands U.S.S.R. The Member Bodies of the following countries disapproved the transformation of ISO/R 1548 into an International Standard : Germany U.S.S.R. @ International Organization for Standardization, 1976 . Printed in Switzerland Copyright International Organization for Standardization ed without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 1548-1976 (E) Aircraft -- Precision fuse-links -- Type A 4 GENERAL REQUIREMENTS 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies the dimensions and The fuse-links shall compiy with the requirements of performance requirements for a range of precision fuse- ISO 1547. links suitable for use in aircraft electrical systems having voltage and freguency characteristics conforming ISO/R 222, at any ambient temperature from -65 to + 85 °c, and all altitudes from 0 to 24 400 m (See aliso 5 DIMENSIONS ISO 1540.) The dimensions of the fuse-links shall comply with table 1 for the ferrule type or table 2 for the tag type. 2 REFERENCES ISO/R 222, Voitages for aircraft electrical systems. 6 CURRENT, VOLTAGE AND BREAKING-CAPACITY ISO/R 469, Dimensions and conductor resistance of general RATINGS purpose electrical cables with copper conductors, for aircraft. The current ratings, the voltage ratings and the breaking capacity ratings of the fuse-links shall be in accordance with ISO/R 474, Performance requirements for general purpose those listed in table 3. electrical cables with copper conductors for aircraft. ISO 1540, Aerospace -- Aircraft electrical systems -- Characteristics. 1 ) 7 TIME/CURRENT CHARACTERISTICS IsO 1547, Aircraft -- Precision fuse-links - General requirements. The pre-arcing time/current characteristics of the fuse-links shall be within the appropriate envelope curves shown in IEC Publication 269, Low-voltage fuses - Part I : General the annex. requirements. 3 TERMINOLOGY 8 TESTS The terminology used in this International Standard is in conformity with IEC Publication 269, as far as practicable The fuse-links