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Re-Architecting the NASA Wire Derating Approach• Design of wiring for aerospace vehicles relies on an understanding of “ampacity,” which refers to the current carrying capacity of wires, individually or in wire bundles.
• Designers rely on standards to derate allowable current flow to prevent exceedance of wire temperature limits due to resistive heat dissipation within the wires or wire bundles. Designers select wire sizing and circuit protective device settings/sizing based on the standards.
• Exceeding the wire temperature rating can result in electrical, physical, and/or chemical degradation of the wiring insulation and conductor which could lead to a catastrophic failure.
• These standards can add considerable margin, in some cases underestimate the margin and are based on empirical data that is no longer available for review.
Document ID
Acquisition Source
Langley Research Center
Document Type
Steven L Rickman
(Langley Research Center Hampton, Virginia, United States)
Date Acquired
November 17, 2021
Subject Category
Space Transportation And Safety
Report/Patent Number
Meeting Information
Meeting: Electrical Wiring Science and Technology Meeting
Location: Virtual
Country: US
Start Date: December 7, 2021
End Date: December 9, 2021
Sponsors: Federal Aviation Administration
Funding Number(s)
WBS: 860921.
Distribution Limits
Work of the US Gov. Public Use Permitted.
Technical Review
Single Expert
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