SIST EN 16602-70-26:2019
(Main)Space product assurance - Crimping of high-reliability electrical connections
Space product assurance - Crimping of high-reliability electrical connections
This Standard specifies:
• Requirements for the following crimping wire terminations intended for high reliability electrical connections for use on customer
spacecraft and associated equipment operating under high vacuum, thermal cycling and launch vibration:
• removable contacts, single wires
• removable contacts, multiple wires
• coaxial connectors, ferrules
• lugs and splices.
NOTE These are the most common used crimping wire termination and are represented in Figure 1 1.
• The general conditions to be met for the approval of terminations other than the above mentioned ones.
NOTE Additional forms of crimps, not covered in this standard, are listed (not exhaustively) in the informative Annex A.
• Product assurance provisions for both the specific and the generic terminations mentioned above.
• Training and certification requirements for operators and inspectors (clause 5.5.2), additional to those specified in ECSS Q ST-20.
This standard may be tailored for the specific characteristics and constraints of a space project, in conformance with ECSS-S-ST-00.
Raumfahrtproduktsicherung - Falten von hochzuverlässigen elektrischen Verbindungen
Assurance produit des projets spatiaux - Sertissage de connections électriques hautes fiabilités
Zagotavljanje kakovosti proizvodov v vesoljski tehniki - Stiskalno spajanje kontaktov visoko zanesljivih električnih konektorjev
Ta standard določa: • Zahteve za naslednje žične priključke za stiskalno spajanje, namenjene za izredno zanesljive električne konektorje za uporabo na vesoljskih plovilih in povezani opremi odjemalca, ki delujejo pri visokem vakuumu, toplotnih cikličnih obremenitvah in vibracijah ob izstrelitvi: • odstranljive kontakte, posamezne žice • odstranljive kontakte, več žic • koaksialne konektorje, tulke • ročaje in spojnice. OPOMBA: To so najpogosteje uporabljani žični priključki za stiskalno spajanje in so predstavljeni na sliki 1.1. • Splošne pogoje, ki jih je treba izpolnjevati za odobritev priključkov, razen že zgoraj navedenih. OPOMBA: Dodatne oblike kodrov, ki niso obravnavane v tem standardu, so navedene (ne izčrpno) v informativnem dodatku A. • Določbe za zagotavljanje varnih proizvodov za posamezne in splošne priključke, navedene zgoraj. • Zahteve za usposabljanje in potrjevanje za upravljavce in inšpektorje (točka 5.5.2) poleg zahtev iz standarda ECSS Q ST-20. Ta standard se lahko prilagodi posameznim lastnostim in omejitvam vesoljskega projekta v skladu s standardom ECSS-S-ST-00.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Raumfahrtproduktsicherung - Falten von hochzuverlässigen elektrischen VerbindungenAssurance produit des projets spatiaux - Sertissage de connections électriques hautes fiabilitésSpace product assurance - Crimping of high-reliability electrical connections49.140Vesoljski sistemi in operacijeSpace systems and operations49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 16602-70-26:2019SIST EN 16602-70-26:2019en,fr,de01-maj-2019SIST EN 16602-70-26:2019SLOVENSKI
STANDARDSIST EN 16602-70-26:20151DGRPHãþD
SIST EN 16602-70-26:2019
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16602-70-26
March
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v {ä s v r Supersedes EN
s x x r tæ y ræ t xã t r s v
English version
Space product assurance æ Crimping of highæreliability electrical connections
Assurance produit des projets spatiaux æ Sertissage de connections électriques haute fiabilité
Raumfahrtproduktsicherung æ Falten von hochzuverlässigen elektrischen Verbindungen This European Standard was approved by CEN on
{ November
t r s zä
C Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN and CENELEC memberä
translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels y any means reserved worldwide for CEN national Members and for CENELEC Membersä Refä Noä EN
s x x r tæ y ræ t xã t r s { ESIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 2 Table of contents European Foreword . 5 1 Scope . 7 2 Normative references . 9 3 Terms, definitions and abbreviated terms . 11 3.1 Terms defined in other standards . 11 3.2 Terms specific to the present standard . 11 3.3 Abbreviated terms. 12 3.4 Nomenclature . 13 4 Principles . 14 5 Requirements . 15 5.1 Preparatory conditions . 15 5.1.1 Facilities . 15 5.1.2 Tools and equipment . 16 5.2 Crimping operations for different types of interconnections . 18 5.2.1 General . 18 5.2.2 Material selection . 19 5.2.3 Process review and documentation . 20 5.2.4 Contact barrel and single wire crimping . 20 5.2.5 Contact barrel and multiple wire crimping . 21 5.2.6 Ferrule shield crimping . 23 5.2.7 Lug and splice wire crimping . 23 5.3 Requirements for crimp configuration qualification . 26 5.3.1 General . 26 5.3.2 Qualification process test procedure . 27 5.3.3 Sealing and marking . 29 5.3.4 Batch to batch variation . 29 5.4 Test methods . 29 5.4.1 General . 29 5.4.2 <> . 29 SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 3 5.4.3 Tensile strength . 30 5.4.4 Metallography . 31 5.5 Quality assurance . 32 5.5.1 General . 32 5.5.2 Personnel training and certification . 32 5.5.3 Workmanship . 35 5.5.4 Visual inspection . 37 5.5.5 Shift performance inspection and test for harness manufacturing . 39 5.5.6 Calibration of crimping tools . 40 5.5.7 Records . 41 5.5.8 Nonconformance . 42 5.5.9 Special crimping activities at spacecraft level, modifications and repairs . 42 5.6 Document requirements. 45 Annex A (informative) Crimp configurations and tools . 46 Annex B (informative) Examples of typical ultimate axial strength . 53 Bibliography . 55
Figures Figure 1-1: Example of interconnections described in this Standard . 8 Figure 5-1: Example of crimping tools . 17 Figure 5-2: Example of a typical connector barrel and single wire crimping . 21 Figure 5-3: Example of a typical connector barrel and multi-wire crimping. 22 Figure 5-4: Example of a typical ferrule shield crimping . 23 Figure 5-5: Examples of typical lug and splice wire crimping (1 of 2) . 25 Figure 5-6: Examples of typical lug and splice wire crimping (2 of 2) . 26 Figure 5-7: Qualification process test procedure flow chart . 28 Figure 5-8: Quality control during crimping operation . 34 Figure 5-9: Visible workmanship standards . 36 Figure 5-10: Workmanship examples and crimp micro-sections . 37 Figure 5-11: Shift performance test flowchart . 44
Tables Table 5-1: Equipment for verification process . 18 Table A-1 : Guideline for selector setting - Four-indent crimp (dispersive) - Single wire . 48 Table A-2 : Guideline for selector setting - Four-indent crimp (dispersive) - Two wires . 49 SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 4 Table A-3 : Guideline for selector setting – Four-indent crimp (dispersive) – Two different wires . 50 Table A-4 : Guideline for selector setting – Four-indent crimp (dispersive) – Single wire . 50 Table A-5 : Guideline for selector setting – Four-indent crimp (dispersive) – Two identical wires . 50 Table A-6 : Guideline for die selection – Regular hexagon (compactive ) – Ferrule coaxial shield crimp . 51 Table B-1 : Typical ultimate axial strength for compactive and dispersive crimped joints manufactured using qualified ESCC wires . 53
SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 5 European Foreword This document (EN 16602-70-26:2019) has been prepared by Technical Committee CEN-CENELEC/TC 5 “Space”, the secretariat of which is held by DIN. This standard (EN 16602-70-26:2019) originates from ECSS-Q-ST-70-26C Rev.1. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2019, and conflicting national standards shall be withdrawn at the latest by September 2019. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN16602-70-26:2014. The main changes with respect to EN16602-70-26:2014 are listed below: • Implementation of ECSS Change requests • Several Figures replaced by new Figures • Clause 3 "Terms, definitions and abbreviated terms" updated • Nomenclature added as clause 3.4 • Titles of clauses 5.1.2.3, 5.2, 5.2.4, 5.2.5, 5.3, 5.3.2, 5.4.3.2, 5.4.3.3 changed • Several changes in the Clause 5.3 “Requirements for crimp configuration qualification” • Several changes in clause 5.4 “Test methods” • Clause 5.5.2 “Personnel training and certification” updated • Clause 5.5.4 “Visual inspection “updated • Several changes in clause 5.5.5 “Shift performance inspection and test for harness manufacturing” • Clause 5.5.9 "Special crimping activities at spacecraft level, modifications and repairs” added • All Figures from Issue C replaced • Annex A "Crimp configurations and tools" updated • Annex B "Examples of typical ultimate axial strength" added This document has been prepared under a standardization request given to CEN by the European Commission and the European Free Trade Association. This document has been developed to cover specifically space systems and has therefore precedence over any EN covering the same scope but with a wider domain of applicability (e.g. : aerospace). SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 6 According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 7 1 Scope This Standard specifies: • Requirements for the following crimping wire connections intended for high reliability electrical connections for use on spacecraft and associated equipment operating under high vacuum, thermal cycling and launch vibration: removable contacts, single wire removable contacts, multiple wires coaxial contacts, ferrules lugs and splices.
NOTE
These are the most commonly used crimping wire connections and are represented in Figure 1-1. • The general conditions to be met for the approval of connections other than the above mentioned ones. NOTE
Additional forms of crimps, not covered in this standard, are listed (not exhaustively) in the informative Annex A. • Product assurance provisions for both the specific and the generic connections mentioned above. • Training and certification requirements for operators and inspectors (clause 5.5.2), additional to those specified in ECSS-Q-ST-20. This standard may be tailored for the specific characteristics and constraints of a space project, in conformance with ECSS-S-ST-00. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 8
Normal socket Normal male
Enlarged socket Enlarged male
MDM socket MDM male
Coax socket Coax male
Power socket Power male
Butt splice Parallel splice
Lug
Figure 1-1: Example of interconnections described in this Standard SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 9 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this ECSS Standard. For dated references, subsequent amendments to, or revisions of any of these publications do not apply. However, parties to agreements based on this ECSS Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references the latest edition of the publication referred to applies.
EN reference Reference in text Title EN 16601-00-01 ECSS-S-ST-00-01 ECSS system - Glossary of terms EN 16602-10-09 ECSS-Q-ST-10-09 Space product assurance - Nonconformance control system EN 16602-20 ECSS-Q-ST-20 Space product assurance - Quality assurance EN 16602-60 ECSS-Q-ST-60 Space product assurance - Electrical, electronic and electromechanical (EEE) components EN 16602-60-05 ECSS-Q-ST-60-05 Space product assurance – General requirements for hybrids EN 16602-70 ECSS-Q-ST-70 Space product assurance - Materials, mechanical parts and processes EN 16602-70-08 ECSS-Q-ST-70-08 Space product assurance - Manual soldering of high-reliability electrical connections EN 16602-70-38 ECSS-Q-ST-70-38 Space product assurance - High-reliability soldering for surface-mount and mixed technology EN 16602-70-71 ECSS-Q-ST-70-71 Space product assurance - Data for selection of space materials and processes
SAE-AS-22520,
24 October 2011 Crimping tools, , wire termination, General specification for
SAE-AS-7928B 10 March 2011 Terminals, lugs, splices, conductor, crimp style, copper, general specification for
ISO 7500-1:2004 Metallic materials - Verification of static uniaxial testing machines - Part 1: tension/compression testing machines - Verification and calibration of the force-measuring system SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 10 EN reference Reference in text Title
ESCC 3901, Issue 2 May 2013 ESCC generic specification No. 3901 Wires and cables, electrical, 600V, low frequency
SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 11 3 Terms, definitions and abbreviated terms 3.1 Terms defined in other standards a. For the purpose of this Standard, the terms and definitions from ECSS-S-ST-00-01 apply, in particular for the following terms: 1. acceptance 2. analysis 3. batch 4. component 5. conformance 6. contaminant b. For the purpose of this Standard, the terms and definitions from ECSS-Q-ST-60-05 apply, in particular for the following terms: 1. process identification document (PID) c. For the purpose of this Standard, the terms and definitions from ECSS-Q-ST-70-08 apply, in particular for the following terms: 1. electrical connection 3.2 Terms specific to the present standard 3.2.1 adjustable indenter tool crimping ratcheting tool which has an adjustable part (setting variable) that indents or compresses the conductor barrel or ferrule 3.2.2 crimping configuration combination of crimping tool, crimp item and number and type of wires defined by the procurement specification NOTE 1 Example of crimp item include lug, splice and contact, ferrule. NOTE 2 Type of wires include material, size, finish and batch if not ESCC qualified wire. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 12 NOTE 3 Crimping tool based on the combination of tool reference, setting and locator (when necessary). 3.2.3 crimping tool mechanical ratcheting tool used for permanently attaching a wire connection device to a conductor by pressure deformation or by reshaping the barrel around the conductor to establish good electrical and mechanical contact 3.2.4 ferrule short metal tube used to make crimp connections to the outer conductor of shielded or coaxial cables 3.2.5 intrinsic wire strength tensile strength of a wire used in a crimped assembly, determined by a specific pull test 3.2.6 lug metallic tube with drilled flange projection for fixing to a connection point 3.2.7 splice metallic tube for joining two or more conductors to each other 3.2.8 terminal metallic device that is used to make an electrical connection 3.3 Abbreviated terms For the purpose of this Standard, the abbreviated terms from ECSS-S-ST-00-01 and the following apply: Abbreviation Meaning AWG American wire gauge DRD document requirement definition IPA iso-propyl alcohol KIP key inspection point MIP mandatory inspection point NCR nonconformance report PID process identification document QA quality assurance RFA request for approval RFW request for waiver RH relative humidity
SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 13 3.4 Nomenclature The following nomenclature applies throughout this document: a. The word “shall” is used in this Standard to express requirements. All the requirements are expressed with the word “shall”. b. The word “should” is used in this Standard to express recommendations. All the recommendations are expressed with the word “should”. NOTE It is expected that, during tailoring, recommendations in this document are either converted into requirements or tailored out. c. The words “may” and “need not” are used in this Standard to express positive and negative permissions, respectively. All the positive permissions are expressed with the word “may”. All the negative permissions are expressed with the words “need not”. d. The word “can” is used in this Standard to express capabilities or possibilities, and therefore, if not accompanied by one of the previous words, it implies descriptive text. NOTE In ECSS “may” and “can” have completely different meanings: “may” is normative (permission), and “can” is descriptive. e. The present and past tenses are used in this Standard to express statements of fact, and therefore they imply descriptive text. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 14 4 Principles This Standard is structured such that the necessary level of quality is achieved, consistently maintained and high reliability of the end product assured. The following principles are covered: • Preparatory conditions to determine the availability of facilities, tools and equipment, along with obligatory hazard and health precautions. • Specific interconnections, as identified in the Scope above, are then covered in detail including Material selection,
Process identification and documentation. • New crimp combinations beyond those identified in the Scope. • Test methods and acceptance criteria for both specific and generic types of interconnections are specified. • Quality assurance measures for both the operator and the inspector are prescribed: Training and certification of personnel, Calibration of tools and equipment, Workmanship standards and acceptance criteria, Inspection criteria and sequence, Records from material incoming inspection through delivery of the end product, including KIP, MIP, travellers, follow-up sheets, log books, traceability samples and the handling of deviations by RFA or NCR. It is important to perform the work taking into account health and safety regulations, and in particular the national standards on this subject. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 15 5 Requirements 5.1 Preparatory conditions 5.1.1 Facilities 5.1.1.1 Overview The requirements in this clause can generally be met by using cleanrooms. It is not, however, mandatory to use a cleanroom. NOTE
Depending on supplier and customer business agreement. 5.1.1.2 Facility cleanliness a. The supplier shall provide cleaning services for production facilities where high reliability crimping is performed. b. Production facilities where high reliability crimping is performed shall be maintained in a clean and tidy condition. c. Loose material that can cause contamination of the crimped connection shall be removed.
NOTE
For example: Dirt, dust, oils and cut wire strands. d. Furniture shall be kept to a minimum in the work areas and be arranged to allow easy and thorough cleaning of the floor. e. Working surfaces shall be covered with an easily cleaned hard top, antistatic mat or have a replaceable surface of clean, non-contaminating silicone-free paper. 5.1.1.3 Environmental conditions a. The crimping area shall have a controlled environment, which limits entry of contamination.
b. The area shall be continuously controlled as follows: 1. room temperature: (22 ± 3) °C; 2. relative humidity:
(55 ± 10) %. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 16 c. The workstations shall not be exposed to draughts. d. Fresh air shall be supplied to the room through a filtering system with positive pressure difference with regard to adjacent rooms. e. The exhaust air shall be suitably restricted. 5.1.1.4 Lighting requirements a. The supplier shall ensure adequate illumination conditions of the crimp workstations. b. The minimum light intensity shall be 1 080 lux on the work surface.
c. A minimum of 90 % of the work area shall be shadow-less and without severe reflections. 5.1.2 Tools and equipment 5.1.2.1 Crimping tools a. The supplier shall provide the tooling necessary for continued high quality crimping. NOTE
Examples of crimping tools are shown in Figure 5-1. b. Tools used shall employ an integral ratcheting mechanism, which controls the crimping operation in conformance to SAE-AS-22520. NOTE
The mechanism ensures that, once the operation is started, the tool cannot be opened until the crimping cycle is complete. c. Tools shall be sealed on one setting value in case of variable settings tools. d. Tool calibration shall be verified in conformance with the clause 5.5.6 requirements. e. Proper operation of the integral ratcheting mechanism or the positive stops on pneumatic tools shall be verified as defined in clause 5.5.6. f. Before starting a crimping process on a new terminal size and wire type, the tool used for crimping of the previous wire type shall be returned to the tool storage. g. If the tool settings seals are found removed or broken, the tool shall be removed from the work place and returned immediately for recalibration. h. Tools used in the crimping operation shall be clean and excess lubricant removed before crimping starts. i. Tools shall be individually labelled. NOTE
This identification is recorded in the manufacturing connector follow up sheet. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 17
Contact crimping tool
Splice-lug crimping tool
Figure 5-1: Example of crimping tools 5.1.2.2 Insulation strippers a. The supplier shall provide the tooling necessary to avoid damage to the conductor. b. The selection of thermal or precision cutting devices, manual or automatic power-driven, shall ensure integrity of the conductor strands.
c. Wire stretching by use of mechanical strippers shall be avoided. d. The conductor shall not be twisted, ringed, nicked, cut or scored by stripping operation. e. Both thermal and mechanical stripping tools shall be calibrated periodically on sample evaluation during a production run. f. For coated wires the exposure of underlined base metal shall be a cause for rejection. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 18 5.1.2.3 Cutting pliers a. The supplier shall provide the tooling necessary for precision wire trimming and cutting. b. The cutter used for trimming conductor wire shall shear sharply and consistently to produce a clean, flat, smooth-cut surface along the entire cut edge.
c. Twisting action during cutting operation shall be avoided.
d. <> e. The cutting edges shall be regularly checked for damage and maintained in a sharp condition. 5.1.2.4 Test and monitoring equipment a. The supplier shall provide the equipment specified in Table 5-1 necessary for verification activities specified in clause 5.4.3.
Table 5-1: Equipment for verification process Performance tests activity Equipment characteristic <> <> Tensile strength (in conformance with clause 5.4.3 requirements) Tensile testing machine conforming to ISO 7500 class 1 or better. Axial load applied at a rate of (20 – 40) mm/min ±2 mm/min Visual inspection Magnification ×7 to u40 Monitoring requirements of the process
Temperature 15 °C to 30 °C, acc×±ate to ±1 °C Relative h×midity (RH) 40 % to 70 %, acc×±ate to ±1 % 5.2 Crimping operations for different types of interconnections 5.2.1 General a. The supplier shall visually examine wires, terminals and connector contacts for cleanliness, absence of oil films and freedom from tarnish or corrosion before assembly. b. The supplier shall perform cleaning of the work pieces using IPA.
c. Further cleaning or other treatment shall not be carried out except the case when validation and qualification of a cleaning product was performed on all used materials. d. The supplier shall handle work pieces with clean lint free gloves or finger cots. e. Before a crimping activity, tools at the operator’s station shall be verified to conform to those selected in accordance with the applicable PID or procedures. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 19 f. All conductor strands shall be inserted cleanly into the barrel without any buckling.
g. Strands shall not be left outside or cut back to reduce the conductor diameter to fit an undersized barrel.
h. The supplier shall use tools as specified in SAE-AS-22520 for the crimp contact configuration. NOTE
Examples of crimping parameters are given in Table A-1 to Table A-6 i. The supplier shall take provisions to avoid degradation of the silver plated wire caused by tarnish during storage.
j. <> k. The crimping of single solid wires shall not be used. 5.2.2 Material selection a. The supplier shall use silver plated copper multi stranded wire and braided shield cable procured in conformance with the requirements from ESCC generic specification 3901.
b. In cases where other types of wire and wire finishes are used a request for approval (RFA) in conformance with DRD from Annex D from ECSS-Q-ST-70 shall be provided to the customer for approval. NOTE
Examples of wire and wire finishes needing RFA include nickel- or fused tin-plated wires, stainless steel, phosphor bronze, copper, constantan, and nickel alloys. c. The supplier shall use high strength copper alloy wire for 24 AWG, 26 AWG and 28 AWG crimped joints. NOTE
Soft or annealed copper wire are not acceptable for crimped joints of 24 AWG, 26 AWG and 28 AWG size.
d. The supplier shall use space-qualified components having gold plated finishes in conformance with ECSS-Q-ST-60. e. Specific items such as ferrules, splices, contacts and lugs shall be purchased to SAE-AS-7928 specification.
f. When gold plating is not available the finish shall be in conformance with ECSS-Q-ST-70-71. NOTE
Ferrules, splice, contacts and lugs supporting an external nickel layer can be used in case there is no alternative finish, although tool wear is accelerated. g. Cadmium, chromate-coated cadmium, tin-lead and non-fused tin-plating shall not be used. NOTE
Tin-lead finish is not acceptable for crimp connection due to creep. SIST EN 16602-70-26:2019
EN 16602-70-26:2019 (E) 20 5.2.3 Process review and documentation
a. The supplier shall perform a review of all the materials, tools and techniques planned to be used to ensure conformance to requirements of this standard and as a means of identifying potential problems. NOTE
Type of wire includes base material, number of strands, plating metal, type and thickness of insulation. b. Dies, setting of controls for the length of strip in automatic stripping machines and the selection of specific locators or positioners for crimping tools, shall be selected to meet process requirements. NOT
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