Plans rl;D - 13 - oU 1Uf: 0.33 Hid nit CHX 1W. 3U]3yuiL4U t.
THREE PHASE SEC. FAULT CURRENT
CUSTOMER NAME: TETRA PLASTTCS
CUSTOMER ADDRESS: SW 72, TIGARD
TRANSFORMER KVA: 1500 KVA •
IMPEDANCE: 5.75 %
SECONDARY L —L VOLTAGE: 480 VOLTS
WIRE LENGTH: 50 FEET
WIRE SIZE: 350 AL
NUMBER OF RUNS: 7 RUNS TOTAL
WIRE IMPEDANCE R: 0.049 OHMS /1000'
WIRE IMPEDANCE X: 0.037 OHMS /1000'
FAULT CURRENT: 26579 AMPS
TES 9/8/93
Post -lt" brand tax transmittal memo 7671 If of Pages r • 1
To 12 .04.09 'Dept Phone M r: t 1
Fea # 2 C7) _ rz_ k Fax 0 = ,
Feb- O%-96 05:O5P BRUCE STOCK (206) 283 -1656 P.02
2/8/96
TOTAL CONNECTED LOAD AT EARTH CITY
Connected Load, A Connected Load, A
Department 480 VAC 30 240 VAC 30
Narrow Sheet Depart. 1750 920
Wide Sheet Dept. 3115
Blow Molding Dept. 850 990
Services & Lighting 1105
TOTAL 6820 f 1910
Assume 100% efficient transformation from 240 to 480.
6820 1 1910/2 = 7775A total connected load @ 480 VAC 30
Highest load reported by Union Electric for Tetra at Earth City was 1044 kw.
Assume power factor (PF) = 0.80
KW = F.x /x/'/•xf
1000
1044 = 480x /x.80x f 1 max = 1569A
1000
As�tu max. load — 1169 = 0.20
Connected load 7775
Design to 0.30 actual load factor.
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