crimping, interconnecting cables, harnesses, and wiring - NASA

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NASA-STD-8739.4 with Change 6individual conductors (Requirement). The length of lay for each layer shall be between 8 and 16times the outer diameter of the harness.7.3.21 The bend radius data given in Table 7-1 shall apply for bending that occurs in theinstalled interconnecting harness or cable (Requirement).7.3.22 Wires exiting from connectors shall be stress relieved (Requirement).7.3.23 The use of solder sleeves (where wire insulation temperatures permit), hand soldering, orcrimp rings are acceptable for terminating individual shields (Requirement).7.3.24 Concern for placement of power and ground lines in contact assignments for systemsafety (Requirement).7.3.25 Materials for potting connectors suited for applications (Requirement).7.3.26 Selection of metal braid shielding should be sized as appropriate per application(Requirement).Table 7-1. Bend Radii for Completed Interconnecting Cable or HarnessWire TypeOptimum BendRadiusMinimumBend RadiusIndividual coaxial cable. 10 x OD 1/ 6 x ODPolyimide (Kapton) insulated 15 x OD 10 x ODOverall harness (with coaxial cable or AWGsize 8 or larger).Overall harness (with AWG size 10 or smallerwithout coaxial cable).Overall harness (with polyimide insulatedwires included).1/ Outside Diameter10 x OD 6 x OD10 x OD 3 x OD15 x OD 10 x ODPage 36 of 114
NASA-STD-8739.4 with Change 68. INTERCONNECTING CABLE/HARNESS FIXTURING8.1 GeneralLayout and fixturing shall be provided for all complex interconnecting cables and harnesses(Requirement). Permanent bends and offsets shall be built into harnesses so that the final wiredress will not be under continuous stress and tension after installation (Requirement). Connectorback shells shall accommodate bends and offsets in wire harnesses, as appropriate, to avoidcontinuous stress (Requirement). Additionally, the layout shall be designed to limit the amountof bending, pulling, and other handling a harness will receive during installation (Requirement).8.2 Mockup and Wiring Board Design ParameterWiring boards and other mockups shall be constructed full size, 3-dimensional, and shall accountfor all the physical restraints the interconnecting harness or cable will encounter (Requirement).Typical harness board layout and typical hardware and fixtures are shown in Figures 8-1 and 8-2,respectively.8.3 Temporary IdentificationTemporary identification markers may be used for in-process identification requirements. Alltemporary markers shall be removed from completed cabling and harnessing (Requirement).The markers shall not leave a contaminating residue (Requirement).8.4 Interconnecting Cable and Harness ProtectionThe supplier shall establish and implement procedures to protect interconnecting cables andharnesses from damage and degradation (Requirement). Connectors not being activelyassembled shall be individually protected by wrapping them in bubble pack or other physicalcovering (Requirement). At the end of the work shift, protective covering shall be spread overthe harnesses in fabrication (Requirement). Harnesses not in active fabrication (those intemporary storage) shall be covered by protective covering (Electrostatic Discharge (ESD)protective covering in accordance with ANSI/ESD S20.20 if Electrostatic Discharge Sensitive(ESDS) parts are utilized) (Requirement).Page 37 of 114
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crimping, interconnecting cables, harnesses, and wiring - NASA

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