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Old 01-29-08, 07:23 AM
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bikingbrit
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Originally Posted by Zero_Enigma View Post
Does anyone know how many amps 18 AWG, 24 AWG, and 20 AWG cable can take?

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Depends on the application. Usually the concern is how hot the wire gets. A single wire in the open air gets plenty of cooling and can handle more current. Wires buried in a transformer get very little cooling and must be much bigger for the same current.

A medium type rating is used for wires in a cable, bundle, or conduit. A handbook I have lists the following:
18 AWG 10 amps
20 AWG 7.5 amps
22 AWG 5 amps

24 AWG is not listed but since it has about 2/3 the cross sectional area as 22 AWG a rating of about 3 amps is appropriate.

Of course if you want maximum efficiency and /or maximum voltage to the load use a thicker (smaller number) gauge.
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