See the NEC for conductor ampacities, correction factors, and conditions of use. * Unless specifically permitted in 240.4(E) through (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied. Because this is only of the only 200+ amp wire sizes it can be used for heavy-duty applications, such as welding or drilling equipment. You can consult the electrical wire size chart above to find all this data. TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, XHH, XHHW, XHHW-2, USE-2, ZW, PV At 75C, the 4/0 copper wire ampacity is 230 amp (with 195 amps and 260 amps at 60C and 90C temperature, respectively).
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