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Old 05-10-2013
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It takes about 14A for 18AWG to reach 90C. At around 11A the temperature will settle down at ~75C, which is still safe short-term (probably a week of 24h load). ATX standard takes about 1/2 of max, thus 18AWG = 7A carrying capacity. 16AWG nets 90C at 18A, and ~75C at around 20A.

The trouble begins with bad contacts (oxidation, loose connector), where the electric resistance rises, causing the power dissipation to spike, producing heat.
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