EN 50389:2005

Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
   3.1 Terms and definitions
   3.2 Abbreviated terms
4 Preparatory conditions
   4.1 Hazards, health and safety precautions
   4.2 Facility cleanliness
   4.3 Environmental conditions
   4.4 Lighting requirements
   4.5 Configuration of process/workpiece
   4.6 Cleaning
   4.7 Tools and equipment
        4.7.1 General
        4.7.2 Cutting tool
        4.7.3 Insulation strippers
        4.7.4 Wire-wrapping tools
        4.7.5 Unwrapping tools
   4.8 Tool calibration
   4.9 Wire-wrap process certification
   4.10 Test monitoring equipment
5 Materials selection
   5.1 Wire
        5.1.1 General
        5.1.2 Conductor
        5.1.3 Wire insulation
   5.2 Terminal post
   5.3 Wire to terminal post combinations
6 Wire-wrap operation
   6.1 Preparation for wire-wrapping
   6.2 Process
   6.3 Wire-wrap criteria
        6.3.1 Usage of wrap levels
        6.3.2 Number of turns on terminal post
        6.3.3 Positioning and regularity of wrap
              connection
        6.3.4 Wire routing
        6.3.5 Rework
        6.3.6 Wire-wrap and solder connections onto the
              same terminal post
7 Test methods
   7.1 General
   7.2 Workmanship
   7.3 Stripping force
   7.4 Unwrapping test
   7.5 Connection resistance
   7.6 Gas-tightness test
   7.7 Metallography
   7.8 Records of tests
8 Acceptance criteria
   8.1 Visual inspection
   8.2 Performance tests
        8.2.1 General
        8.2.2 Stripping force test
        8.2.3 Unwrapping test
        8.2.4 Connection resistance test
        8.2.5 Gas-tightness test
        8.2.6 Metallography
9 Quality assurance
   9.1 General
   9.2 Data
   9.3 Nonconformance
   9.4 Calibration
   9.5 Traceability
   9.6 Workmanship standards
   9.7 Operator and inspector training and
        certification
   9.8 Inspections
        9.8.1 Visual inspection
        9.8.2 Process control
10 Verification
   10.1 General
   10.2 Temperature cycling
   10.3 Vibration
Annex A (informative) Daily process control sheet for
                      test samples
Bibliography

This standard specifies the methods for preparing and assembling the parts to be joined by wire wrapping, and the selection, calibration, use and certification of the wire wrapping tools. The required wire­wrapped connections are illustrated in Figure 1. This type of connection is similar to “Class A preferred” or “modified” connection detailed in MIL STD 1130, and NASA NHB 5300.4(3H). Only tested and qualified wire­wrapped connections are covered by this standard, which lists four wire sizes from 24 AWG to 30 AWG, and three terminal post sizes up to 1,78 mm maximum diagonal. The use of thicker wire and larger terminals are not advised. Thicker wire than 24 AWG is generally multistranded and terminated by soldering (see ECSS Q 70 08) or by crimping (see ECSS Q 70 26). Training and certification requirements for operators and inspectors are defined in 9.7 and in EN 13291 1.