CABLE AND HARNESS
MULTI-CONDUCTOR
multiconductors
MULTI-CONDUCTOR

Multi-conductor cable is an engineered wiring product, typically constructed of two (2) or more individually insulated conductors, bound together by an overall insulation jacket (unshielded); or, bound and wrapped with an overall metallic covering (braid or foil), and covered by an overall insulation jacket (shielded).

Multiconductor cable is used primarily for the transmission of control and/or data signals.

See Section 4.01 "Cable and Harness, General Requirements", for common accept/reject criteria.
cable and connectors cables with bend radius

GENERAL REQUIREMENTS

Cable and connectors are clean, damage-free and free of contamination and/or corrosion. Shields are terminated per engineering requirements. Dimensions, layout and identification meet design requirements.

NASA-STD-8739.4 [19.6.1]

PREFERRED

BEND RADIUS
(EXCLUDING KAPTON®)

Cables insulated with materials other than Kapton® shall not be bent less than six (6) outer diameters. The recommended long-term bend radius is ten (10) diameters.

NASA-STD-8739.4 [7.3.21]
cables with bend radius crimp sleeve and shield termination

PREFERRED

BEND RADIUS
(KAPTON®)

Kapton® insulated cables shall not be bent less than ten (10) outer diameters. The recommended long-term bend radius is fifteen (15) diameters.

NASA-STD-8739.4 [7.3.21]

ACCEPTABLE

SHIELD TERMINATION - CRIMP SLEEVE

Heat shrink sections are properly installed, tightly shrunk and the termination is visible. Overlaps meet minimum electrical spacing. Ground wire exhibits proper bend radius and strain relief.

NASA-STD-8739.4 [7.3.22], [19.6.1]
NASA WORKMANSHIP STANDARDS
NASA logo Released:
04.05.2002 		Revision:
 		Revision Date:
Book:
4 		Section:
4.03		 Page:
1




CABLE AND HARNESS
MULTI-CONDUCTOR (cont.)
lash splice solder sleeve termination

ACCEPTABLE

SHIELD TERMINATION - LASH SPLICE
INTERIM ASSEMBLY

The termination exhibits a fully wetted solder termination. Shield braid is smooth and evenly dressed with no sharp edges or projections. Shrink tubing properly installed and tight.

Best Workmanship Practice

ACCEPTABLE

SOLDER SLEEVE TERMINATION

The solder sleeve has been properly installed and tightly shrunk. Strain relief is acceptable. Overlaps are of sufficient length to meet minimum electrical spacing. Solder fillet is visible, fully flowed and smooth.

NASA-STD-8739.4 [11.4]
strain relief cable with improper strain relief

ACCEPTABLE

STRAIN RELIEF

The cable (shielded/unshielded) should be dressed to ensure that the strain relief mechanism transfers structural stresses from the connector to the cable sheath (or strength member) rather than to the individual conductors.

Best Workmanship Practice

UNACCEPTABLE

IMPROPER STRAIN RELIEF

The cable has been dressed in a manner that results in the possible transfer of stress from the connector to the individual conductors, rather than to the cable sheath or stress member.

Best Workmanship Practice
projecting shield strands

UNACCEPTABLE

PROJECTING SHIELD STRANDS

The shield strands have been improperly dressed, resulting in projecting strands that may result in an electrical short or sharp object (puncture/snag) concern.

Best Workmanship Practice
NASA WORKMANSHIP STANDARDS
NASA logo Released:
04.05.2002 		Revision:
 		Revision Date:
Book:
4 		Section:
4.03		 Page:
2





Click here for printable .pdf file for Section 403 Cable and Harness Multi-Conductor click here to download Adobe Reader Click here to email the author of the Pictorial Reference Handbook
Need a printed copy?
(May take a while to load.)
Requires Adobe Reader. 		Need Adobe Reader?
Click here to download. 		Questions? Suggestions?