CABLE AND HARNESS
DISCRETE CONDUCTOR HARNESSES
discrete conductor harnesses
DISCRETE CONDUCTOR HARNESSES

Discrete conductor harnesses are built to print for specific applications, and are constructed of one or more individually insulated wires, cables or fiber optics; with or without an overall helical twist; with or without an overall covering, jacket or metallic braid; with or without breakouts; assembled with two or more electrical termination devices; and engineered as a unit that can be assembled and handled as a single component.

See Section 4.01 "Cable and Harness, General Requirements", for common accept/reject criteria.

harnesses cables and harnesses in bend radius

PREFERRED

GENERAL HARNESSES

Harness and connectors are clean, damage-free and free of contamination and/or corrosion. Dimensions, layout and identification meet design requirements.

NASA-STD-8739.4 [19.6.1.e]

MANDATORY

BEND RADIUS

Cables and harnesses shall not be subjected to bending forces resulting in radii less than the minimum specified for the most sensitive component (i.e.: coaxial, fiber, etc.) in the assembly.

Best Workmanship Practice

conductor dress braided metallic shield

ACCEPTABLE

CONDUCTOR DRESS

All wires are dressed with even bends and sufficient strain relief. Conductor crossover is minimized.

NASA-STD-8739.4 [19.6.1.e]

ACCEPTABLE

OVERALL SHIELDING

An overall braided metallic shield provides mechanical and electrical protection (EMI/RFI) to the harness. Metallic shielding shall exhibit a smooth and tight finish, with a uniform distribution of coverage and no projecting strands.

NASA-STD-8739.4 [11.1.3]

NASA WORKMANSHIP STANDARDS
NASA logo Released:
04.05.2002
Revision:
Revision Date:
Book:
4
Section:
4.02
Page:
1




CABLE AND HARNESS
DISCRETE CONDUCTOR HARNESSES (cont.)
wrap spacing at breakout uniform conductor tension

ACCEPTABLE

TIE/WRAP SPACING AT BREAKOUT

Lacing or tie wraps have been placed on both sides of the harness breakouts. Ties are neat and tight.

NASA-STD-8739.4 [9.6]

ACCEPTABLE

UNIFORM CONDUCTOR TENSION

The conductors exhibit uniform tension throughout the length of the harness. No bunching, bowing, looping, kinks, etc.

NASA-STD-8739.4 [19.6.1.e.3]

incorrect tie spacing

UNACCEPTABLE

INCORRECT TIE SPACING

Cable ties/wraps have not been properly spaced relative to bundle/harness diameter.

NASA-STD-8739.4 [19.6.2.d.7]













NASA WORKMANSHIP STANDARDS
NASA logo Released:
04.05.2002
Revision:
Revision Date:
Book:
4
Section:
4.02
Page:
2





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