5.- What size THHN conductor is required to supply a 200 amp. feeder? a) No. 1/0

Question

5.- What size THHN conductor is required to supply a 200 amp. feeder? a) No. 1/0 c) No. 3/0 b) No.2/0 d) No. 4/0 6.- What ground conductor is it necessary for three, No. 3/0 copper conductors per phase, installed in parallel (electrically connected at each end to form a single conductor)? 7.- Determine the ampacity of 4 No. 6 THHN conductors in a conduit at an ambient temperature of 100° F 8.- For a 3000 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 VAA/C . Calculate: a) The feeder conductor size b) The grounding copper conductor size

Explanation / Answer

Question 5.

Answer: using the ampacity chart we find 2/0 THHN conductor is required to supply 200 ampere feeder.

Question 6.

Answer : according to national electric code for phase 3/0 phase 200 A current is requried. from the table for 200 phase ground copper wire size is 6

Question 7.

answer: the ampasity of the conductor int he conduit for given temprature is 20*4 =80A

Question8.

answer:

Total VA = 1500+800+8000+5000+5000+10000 = 30300VA

voltage V = 220 volt

current I = 30300/220

current I = 137.73A

which means conductor must be 1/0 AWG for feeder and 6 AWG for grounding.

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