crimping, interconnecting cables, harnesses, and wiring - NASA

NASA-STD-8739.4 with Change 64. GENERAL4.1 General4.1.1 Implementation. NASA quality assurance personnel will advise and assist suppliers,NASA personnel, and delegated agencies in the proper and effective implementation of theprovisions of this publication. Effective implementation includes establishing a system that willidentify each inspection point and provide records.4.1.2 Changes in Requirements. When related requirements or changes in requirements arespecified, NASA quality assurance personnel will assure that the Government agency delegatedto inspect at the supplier's site of fabrication has received full instructions so that the work willbe inspected to actual contract requirements.4.1.3 Nonstandard Processes, Materials, or Parts. When the supplier intends to use processes,materials, or parts not covered by this publication, the supplier shall document the details offabrication and inspection, including acceptance and rejection criteria, and shall provideappropriate test data (Requirement). Such documentation shall be approved by the procuringNASA Center prior to use (Requirement).4.2 Approval of Departures from this Standard4.2.1 Departures from this publication require written approval from the cognizant NASAcontracting officer. The supplier is responsible for assuring that any departures from thispublication are evaluated by, coordinated with, and submitted to the procuring NASA Center forapproval prior to use or implementation.4.2.2 For in-house NASA projects, this publication requires written approval by the in-houseNASA project management to deviate from the provisions herein.4.3 Principles of Reliable Cabling and Wiring4.3.1 Factors Controlling Reliability. Reliable interconnecting cable and wire harnesses resultfrom proper design, control of tools, materials, work environments, and careful workmanship bytrained and certified personnel.4.3.2 Fabrication Principles. All fabrication shall be performed to meet governing engineeringdocumentation (Requirement).4.3.3 Splicing. Splicing damaged or broken conductors is not permitted.4.3.4 Crimping. Stranded wire shall be used for crimping (Requirement). Crimping of solidwire is prohibited. Crimping of solder tinned wire is prohibited.4.3.5 Design Considerations. The basic design considerations to assure reliable interconnectingcable and wire assemblies are as follows:a. The associated materials, parts, and hardware used shall be selected to provide proper fit,function, and support of wiring and cabling (Requirement).Page 23 of 114