Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Ampacity" Definition
noun
The root mean square of the electrical current which a device (usually a wire) can carry within a specific environment (including temperature rating, power loss, heat dissipation, etc.) it is measured in amperes, (amps) and is most often used to rate electrical wires and cables.
Source: Wiktionary
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