HomeMy WebLinkAboutB14-0350 REV1 load calcs 2.pdf -WI
LLSON ELECTRICAL CONSUIJTING, INC.
Vern Willson, RE. (303) 883-2208
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Isc CALCULATIONS - THREE PHASE
POINT#0,500 KVA Xfmr,120/208 v
Isc 77,100 A
POINT#1, 1200 amp Meter Stack
f = 1.73 x Length x Isc(source) / L-L Volts x Wire Factor
f = 1.73 x 350 x 77,100 A/ 208 x 90,944
f = 2.47
M = 1 / 1+f =1/ 1+ 2.47 = 0.29
Isc = M x Isc(source)= 0.29 x 77100 A = 22,232 A
POINT#2, Unit-386D
f = 1.73 x Length x Isc(source) / L-L Volts x Wire Factor
f = 1.73 x 95 x 22232 A / 208 x 3,713
f = 4.73
M = 1 / 1+f = 1/ 1 + 4.73 = 0.17
Isc = M x Isc(source)= 0.17 x 22232 A = 3,879 A
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