Amps 4. The allowable ampacity for a # 20 THHN copper conductor is 5- What size

Question

Amps 4. The allowable ampacity for a # 20 THHN copper conductor is 5- What size THHN conductor is required to supply a 250 amp feeder? a) No. 1/O c) No. 3/0 b) No.2/0 d) No. 4/ 6.- What ground conductor is it necessary for two, No. 4/0 copper conduct installed in parallel (electrically connected at each end to form a single conductor)? rmine the ampacity of 4 No, 4 THHN conductors in a conduit at an ambient temperatur of 100° F 7.- Dete 8.- For a 3500 sq. ft. residential unit with the following loads: 1500 VA dishwasher 800 VA disposal 8000 VA range 5000 VA W.H 5000 VA dryer 10000 VA A/C Calculate a) The feeder conductor size b) The grounding copper conductor size

Explanation / Answer

4) The allowable ampacity for a #2/0 THHN copper conductor is 195 A

5) For a 250 Amp feeder you can use 4/0 which has a maximum allowable ampacity of 260 A

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