Fault Current AIC Demo

Try the Bussmann point-to-point method for short-circuit current (AIC) at a downstream panel -- no signup required.

Calculation Metadata

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Inputs

Method: Bussmann point-to-point (v2), three-phase bolted fault, transformer-defined origin, one downstream segment. The full calculator supports multiple segments, all fault types, known-available source models, and motor contribution sizing.

Transformer source

kVA %Z (impedance) Voltage L-L (V)

Downstream segment

Length (ft) Parallel conductors (n) Conductor size Conductor material Conduit material

Optional

Include motor contribution (adds ~4x motor FLA to destination current) Total motor current (A) Equipment AIC rating (A) ?

Results

Origin available fault current (transformer secondary) 11621.4A

Destination fault current (base, no motor) 10178.4A

Destination fault current (total) 10178.4A | 10.18kA

Need more than one segment, or other fault types?

The full ElectraCalcIQ Fault Current AIC calculator supports multi-segment paths (cable + busway), three-phase / line-to-line / line-to-ground faults, known-available-source models, motor sizing, and exports.

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Math Window

Formulas

Transformer origin current

I_FL = (kVA * 1000) / (sqrt(3) * V_L-L); I_SC = I_FL * (100 / (%Z * 0.9))

Units: A

Segment reduction factor (f)

f = (1.732 * L * I_begin) / (C * n * E_L-L)

Units: ratio

Segment multiplier
```
M = 1 / (1 + f)
```
Units: ratio
Segment end current
```
I_end = I_begin * M
```
Units: A

Ordered Steps

Origin available fault current
```
transformer_defined_origin
```
Result: 11621.4

Units: A
Segment 1 (Run)
```
C=22185, n=1, L=75.0
```
Result: I_begin 11621.4 -> I_end 10178.4 (f=0.14176410033857662, M=0.8758376618282725)

Units: A

Destination fault current

I_destination_total = I_destination_base + I_motor

Result: 10178.4

Units: A

Engineering Use Notice

Calculator outputs are provided as engineering support and workflow aid. They do not replace licensed professional judgment, project-specific design review, or code-required responsibility.

See full details in the Engineering Disclaimer.