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How many amps can a 8 wire handle?

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July 17, 2009 1:43PM

This depends on the type of insulation which is printed on the wire. The ampacity table in the Code is based on not more than 3 insulated conductors in a raceway (conduit) or a cable. The rating goes from 40 A for TW and UF cable to 55 amp for THHN and THHW wire, the most common type sold. So if your wire is anything other than TW or UF, it'll safely carry 50 amps. The entire chart is table 310-16 & 310-18 in the National Electric Code.