through the grounding hex screw. a) True b) False 4-The allowable ampacity for a
ID: 2248971 • Letter: T
Question
through the grounding hex screw. a) True b) False 4-The allowable ampacity for a # 2/O THHN copper conductor is S.- What size THHN conductor is required to supply a 250 amp feeder? Amps. a) No. 1/0 c) No. 3/0 b) No.2/0 d) No. 4/0 6.- What ground conductor is it necessary for two, No. 4/0 copper conductors per phase, installed in parallel (electrically connected at each end to form a single conductor)? 7.- Determine the ampacity of 4 No, 4 THHN conductors in a conduit at an ambient temperature of 100° F 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 bi Tho guoExplanation / Answer
(4) the allowable ampacity of #2/0 THHN copper conductors is 195 Amps.
(5) the 4/0 THHNn copper conductor has a maximum allowable ampacity of 260Amps. as the question requires250 Amps. so the 4/0 is sufficient .so option (d) is correct.
(7) the ampacity of #4/0 THHN copper conductors at 100degress of F is equal to correction factor at the 100 degrees of F* ampacity of #4/0 THHN conductor
ampacity =0.91*260=236.6Amps
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