crimping, interconnecting cables, harnesses, and wiring - NASA

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Page 56 of 114 NASA-STD-8739.4 with Change 6 (Requirement). The end of the grounding wire shall be flush with the outer ferrule, but shall not overhang the inner ferrule (Requirement). The grounding wire detachment force from the crimped sleeve shall meet the requirements of paragraph 13.7 (Requirement). Figure 11-3. Individual Shield Termination Using a Two-Piece Crimp Ring 11.6 Group-Grounding of Individual Shield Terminations When grounding wires of individual cable shields are grounded to one point, they shall be spliced to a common grounding wire (Requirement). No more than four conductors plus a drain wire shall be terminated in one splice (see Figure 11-4 and Figure 11-5) (Requirement). For ordinary RFI/EMI protection, the shield shall be terminated within 100mm (4 inches) of the center conductor termination for the x-distance, and the combined length of shield grounding wires shall not exceed 190mm (7.5 inches) for the y-distance (Requirement). For interference sensitive circuits, preferred lengths are 20 and 115mm (.75 inches and 4.5 inches). See Table 11-1 for the x and y distances. When this does not provide adequate isolation, RFI/EMI connector backshells may be necessary.
Figure 11-4. Group Grounding of Staggered Shields Page 57 of 114 NASA-STD-8739.4 with Change 6 Table 11-1. Shield Termination Control for Group Grounding Name of Circuit X-Distance Max. mm (Inches) X-Distance Min. mm (Inches) Y-Distance Max. mm (Inches) Interference sensitive 20.0 (0.75) 13 (.50) 115.0 (4.5) Ordinary interference protection 100.0 (4.0) 13 (.50) 190.0 (7.5)
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NASA TECHNICAL STANDARD National Ae
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Status Document Revision DOCUMENT H
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Page 9 and 10: TABLE OF CONTENTS Page 9 of 114 NAS
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Page 19 and 20: PVDF Polyvinylidene Fluoride RF Rad
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FIGURE A-25 FIGURE A-26 CRIMPS: INS
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FIGURE A-29A CRIMPS: UNACCEPTABLE P
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crimping, interconnecting cables, harnesses, and wiring - NASA

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