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Fault Current Calculation
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Fault Current Calculation
NEC Fault-Current Calculator
NEC Fault-Current Calculator
Determine the available fault current using NEC-compliant formulas.
Add the utility inputs
Voltage
208 V
240 V
480 V
Phase
Single Phase
Three Phase
Utility Fault Current (A)
100 kA
65 kA
42 kA
22 kA
10 kA
Begin assembling your system by adding the electrical components:
Add the utility transformer, switchboard, or panel name as the first piece of electrical equipment.
Series Components
+ Add Component
Component 1
Remove
Bus Name
Select Conductor/Transformer
Conductor
Transformer
Length (ft)
Size
14
12
10
8
6
4
3
2
1
1/0
2/0
3/0
4/0
250
300
350
400
500
600
750
1000
Parallel Runs
Conductor Type
Copper
Aluminum
Conduit Type
PVC
EMT
MC
SER
Primary Voltage (L–L)
Secondary Voltage (L–L)
kVA
% Impedance
Calculate Fault Currents
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