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HW7_216_F11__solutions

# HW7_216_F11__solutions - BRAE 216 Fall 2011 Homework#7 Name...

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BRAE 216 Homework #7 Fall 2011 Name Solutions _ 1. What size copper wire cable (THW insulation) is needed for the following motor located 150 ft from the service entrance? (use 3% voltage drop maximum). 5Hp, 240V, single phase. 125% Full Load Amps from Table 8 AWH 35A Table 18 AWH Ampacity #8 AWG Voltage Drop (150ft) #6 AWG Final Wire Size = #6 AWG copper Type THW 2. What size copper wire is needed for a 240 V, three phase , 50 hp irrigation motor located 200 ft from the service entrance. Use overhead wire (SE). 125% Full Load Amps from Table 9 AWH 163A Assume 2% Voltage Drop from Table 28 AWH (single overhead) Ampacity #2/0 Voltage Drop (200 ft) #3/0 Mech Strength #8 Final Wire Size = #3/0 overhead SE 3. It is desired to run power to the shop by directly burying the wire from the power pole to the shop. Select a wire type and size for the HOT wires. State all your assumptions. Direct Burial – Type USE, Copper, 2% VD 225A From Table 16 Type USE Ampacity #4/0 Voltage Drop 400 kcmil

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HW7_216_F11__solutions - BRAE 216 Fall 2011 Homework#7 Name...

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