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CURRENT RATING OF AIRCRAFT CABLES FOR A-C SYSTEMS,
NAVAL RESEARCH LAB WASHINGTON D C
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An experimental investigation was made to determine the significance of the skin and proximity effect for the installation and current rating of aircraft cables in threephase alternating-current systems with frequencies up to 800 cycles per second. It was found that the effects are small for all cable sizes, configurations and number of cables per phase. In so far as the thermal limitation is controlling, cables in a-c systems may be installed as in d-c systems. The current rating methods proposed in NRL Memorandum Report 442 for d-c systems may be applied without modification to 400-cycle a-c systems. The same methods methods may be applied to 800-cycle systems provided that the higher a-c resistances be used in place of the d-c resistance. Author
APPROVED FOR PUBLIC RELEASE