HomeMy WebLinkAboutEpstein Fault Calculation by:John Sokolik Ver. 7.1
Utility Fault Current 30,684 amperes kVA =75
E =240
I = kVA x 1000 = trans. FLA trans. FLA =313
Isca = trans. FLA x 100 x PF PF =
transformer Z Z =
Isca = ampere short-circuit current RMS symmetrical. Isca =0 amperes
Point to Point Method
Length (distance) L =135
2 x L x I (ASC) Isca =30,684
N x C x E L-N # conductors per phase N =1
C =10,741
E L - L =240 Volt
f =3.214
C =8,964
Multiplier E L - N =120 Volt
f =11.553
M = 1
1 + f Line to Line M =0.237
Line to Neutral M =0.080
Isca x M = fault current at terminals of main disconnect L- L =7,282 amperes
Isca x M = fault current at terminals of main disconnect L- N =2,444 amperes
Fault Current at Service Equipment
Volt Line to Line
Neutral conductor constant Neutral Conductor
Volt Line to Neutral
'f ' factor =
Phase conductor constant Phase Conductor
Lillian Epstein, 150 Ocean Estates Dr. Fort Pierce Fl. 34949
Courtney Elecetric LLC, 9035 Americana Rd Vero Beach Fl. 32966
Available Fault Current Calculation
E
jmp1jds@comcast.net
=
Fault Current from
L =85
2 x L x I (ASC) Isca =7,282 Phase 2,444 Neutral
N x C x E L-N # conductors per phase N =1
C =11,174 Phase Conductor
Volt Line to Line E L - L =240 Volt
f =0.462
C =9,238 Neutral Conductor
Volt Line to Neutral E L - N =120 Volt
Multiplier f =0.375
M = 1 Line to Line M =0.684
1 + f Line to Neutral M =0.727
4,982 amperes
1,778 amperes
Service Equipment to Panel __
Single Phase Feeder
'f ' factor =
Phase conductor constant
Length (distance)
Neutral conductor constant
Isca x M = fault current at terminal of the panel L- L =
Isca x M = fault current at terminal of the panel L- N =
Calculation does not include motor contribution