
Ampacity is a portmanteau for ampere capacity defined by National Electrical Safety Codes, in some North American countries. Ampacity is defined as the maximum amount of electrical current a conductor or device can carry before sustaining immediate or progressive deterioration. Also described as current rating or current-carrying capacity, ampacit...
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http://en.wikipedia.org/wiki/Ampacity

Refers to the how much current a wire can safely carry. For example, a 12 gauge electrical copper wire can safely carry up to 20 amps.
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http://www.encyclo.co.uk/local/20933

The current carrying capacity expressed in amperes.
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http://www.mhia.org/learning/glossary/a

The current in amperes that a conductor can carry continuously under given conditions of use without exceeding its temperature rating.
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http://www.youngco.com/young2.asp?ID=4&Type=3
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