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# Mathcad - 13-08 and 09 - Ω CM ⋅ ft ⋅ = D for copper...

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A 70 amp fuse is the next lowest, so it would be the largest allowable fuse. However, if it did not allow the motor to start then the next size could be used--80 amps. MaxFuse 75.9A = MaxFuse 3 FLA = From table 430-152, the maximum size single element fuse is 300% of FLA FLA 25.3 amp = From table 430-150, the rated FLA for a 7.5 hp motor at 200 volts is Problem 13-9: Solution R 9.343 10 4 - × = R ρ l Area = l 100 ft = ρ 10.371

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Unformatted text preview: Ω CM ⋅ ft ⋅ = D for copper . 10.371 ( S-cmil) per ft Area 1.11 10 3 × kcmil = Area 2000 mils ⋅ ( ) 2 1700 mils ⋅ ( ) 2-= Therefore the area in CM is or 1700 mils ID 1.7 in ⋅ = or 2000 mils OD 2 in ⋅ = The area of the pipe is the area of a solid conductor with the same radius of the pipe minus the area of the hole in the center: Problem 13-8: Solution...
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