8056/1 (ISO International Standard inTEe RNATiONAL ORGANizATIOn FOR STANDARDIZATION ME XAYHAPOAHAA OPrAHM3AuWA nO CTAHAAPTW3AuMW-ORGANiSATION INtE RNATIOnALE DE NO RMALiSATION Aircraft -- Nickel-chromium and ,nickel-aluminium thermocouple extension cables Part 1 : Conductors - General requirements and tests Aéronefs -- Cables de compensation de couples thermoelectriques en nickel-chrome et en nickel-aluminium -- Partie 1 : Conducteurs - Exigences generales et essais First edition - 1985-04-15 ISO 8056/1-1985 (E) Ref. No. ISO 8056/1-1985 (E) UDC 621.315.55 : 629.7 Descriptors : aircraft, aircraft equipment, thermocouples, electric extension wires, electric conductors, specifications, tests. Price based on 6 pages Not forResa Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member the right to be represented on that committee. International organizations, govern- mental 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. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 8056/1 was prepared by Technical Committee ISO/TC 20, Aircraft and spacevehicles. International Organization for Standardization, 1985 Printed in Switzerland aaza ed without licensefrom IHS Not for Resale ISO 8056/1-1985 (E) INTERNATIONAL STANDARD Aircraft - Nickel-chromium and nickel-aluminium thermocouple extension cables Part 1 : Conductors - General reguirements and tests Scope and field of application Each reel or coil of wire to be used in the manufacture of the 1 conductors shall be tested in accordance with 5.1 and 5.2 This part of IS0 8056 specifies the design requirements and Finished conductors shall be tested in accordance with 5.3 and 5.4. tests for the conductors of thermocouple extension cables, using nickel-chromium and nickel-aluminium, for installation in aircraft temperature indicator and control systems. 4 Conductor construction Methods for determining the thermo-e.m.f. of conductor wires against platinum are given in the annex. The positive conductor shall consist of stranded, bright. annealed, nickei-chromium alloy wires complying with the requirements of clause 3. References The negative conductor shall consist of stranded, bright IEC Publication 564, D.C. bridges for measuring resistance. annealed, nickel-aluminium alloy wires complying with the requirements of ciause 3. IPTS 68, International Practical Temperature Scale of 1968. Joints in single wires shall be welded, brazed or silver-soldered, but the complete conductor shall not be joined. There shall be Conductor materials no kinks, broken wires or other irregularities in the conductors. Conductors for use in the construction of thermocouple exten- sion cables for aircraft shall be manufactured from bright, Tests 5 annealed, nickel-chromium (non-magnetic) wires and bright, annealed, nickel-aluminium (magnetic) wires. 5.1 Thermo-electric tests on conductor wires They shall comply with the requirements specified in table 1 in terms of d.c. resistance and those in table 2 in terms of thermo- All wires, before stranding, shall be shown to comply with the e.m.f. characteristics against platinum over the appropriate requirements specified in table 2 with respect to thermo-e.m.f. against platinum1) over the range of temperature appropriate to temperature range. the cable under manufacture. Tabie 3 shows the resistances which have been assumed for nickel-chromium and nickel-aluminium wires in the calculation Measurements shall be made on sample lengths taken from of d.c. conductor resistances. both en