ABCDEFGHIJKLM
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Job Name
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Company Name
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Available Fault Current Calculation
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 by:John SokolikVer. 4.00
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Utility Fault Current
0amperes kVA =300
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 E =0
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I = kVA x 1000 = trans. FLA
trans. FLA =
0
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0
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Isca = trans. FLA x 100
= PF =90%
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transformer Z
Z =3% %
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Isca = ampere short-circuit current RMS symmetrical.
Isca =
3,000 amperes
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Point to Point Method
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Length (distance)
 L =150
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 'f ' factor = 2 x L x I (ASC) Isca =3,000
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N x C x E L-N
# conductors per phase
 N =1
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 Phase conductor constant C =0Phase Conductor
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Volt Line to Line E L - L =0Volt
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 f =0.000
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 Neutral conductor constant C =0Neutral Conductor
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MultiplierVolt Line to Neutral E L - N =0Volt
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 f =0.000
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 M = 1
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 1 + fLine to Line M =1.000
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Line to Neutral
 M =1.000
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Fault Current at Service Equipment
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Isca x M = fault current at terminals of main disconnect L- L =
3,000 amperes
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Isca x M = fault current at terminals of main disconnect L- N =
0 amperes
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Fault Current from
Service disc. to panel "_____"
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Single Phase Feeder
Length (distance)
 L =
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 'f ' factor = 2 x L x I (ASC) Isca =3,000 Phase 0 Neutral
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N x C x E L-N
# conductors per phase
 N =
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 Phase conductor constant C =0
Phase Conductor
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Volt Line to Line
 E L - L =0Volt
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 f =0.000
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 Neutral conductor constant C =0
Neutral Conductor
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Volt Line to Neutral
 E L - N =0Volt
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Multiplier f =0.000
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 M = 1 Line to Line M =1.000
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 1 + f
Line to Neutral
 M =1.000
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 Isca x M = fault current at terminals of the panel L- L =3,000 amperes
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 Isca x M = fault current at terminals of the panel L- N =0 amperes
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Calculation does not include motor contribution
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Branch Circuit Fault from
Point to Point
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Error Single Phase Feeder
Length (distance)
 L =
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 'f ' factor = 2 x L x I (ASC) Isca =3,000 Phase 0 Neutral
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N x C x E L-N
# conductors per phase
 N =
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 Phase conductor constant C =0
Phase Conductor
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Volt Line to Line
 E L - L =0Volt
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 f =0.000
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 Neutral conductor constant C =0
Neutral Conductor
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Volt Line to Neutral
 E L - N =0Volt
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Multiplier f =0.000
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 M = 1 Line to Line M =1.000
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 1 + f
Line to Neutral
 M =1.000
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 Isca x M = fault current at terminals of the panel L- L =3,000 amperes
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 Isca x M = fault current at terminals of the panel L- N =0 amperes
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Calculation does not include motor contribution
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