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# Short circuit current calculation at various point of electrical circuits (Isc)

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## Available fault current calculation

### Infinite Bus Method

#### 1. Fault Current At Transformer

##### Inputs:

• Transformer Kva
• Secondary Voltage of Transformer (Line-Line)
• Secondary Voltage of Transformer (Line-Neutral)
• Transformer Impedance (Zt)
• Transformer Secondary Full Load Current I (Line-Line)
• Transformer Secondary Full Load Current I (Line-Neutral)

• KVA Short Circuit At Primary Side
• Source Impedance (Zu)
• Total Impedance (Z =Zu+Zt)
• Short Circuit Current RMS Symmetrical
• Fault Current At Transformer Secondary ( Isc(L-L)=I (L-L)/Total Impedance)
• Fault Current At Transformer Secondary ( Isc(L-N)=I (L-N)/Total Impedance)

#### 2. Fault Current At Main Panel

##### Inputs:

• Cable Length from Transformer to Main Panel
• Type of Cable
• No of Conductor/Phase
• Size of Phase Conductor
• Size of Neutral Conductor
• Type of Race Way
• Phase Conductor Constant (C1)

• Neutral Conductor Constant (C2)
• F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
• F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
• M1(L-L) [M=(1/(1+F1)]
• M2(L-N) [M=(1/(1+F2)]
• Fault Current at Main Panel Disconnection (L-L) [Isc X M1]
• Fault Current at Main Panel Disconnection (L-N) [Isc X M2]

#### 3. Fault Current At Sub Panel

##### Inputs:

• Cable Length from Main Panel to Sub Panel
• Type of Cable
• No of Conductor/Phase
• Size of Phase Conductor
• Size of Neutral Conductor
• Type of Race Way
• Phase Conductor Constant (C1)

• Neutral Conductor Constant (C2)
• F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
• F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
• M1(L-L) [M=(1/(1+F1)]
• M2(L-N) [M=(1/(1+F2)]
• Fault Current at Sub Panel Disconnection (L-L) [Isc X M1]
• Fault Current at Sub Panel Disconnection (L-N) [Isc X M2]

#### 4. Fault Current At Distribution Board

##### Inputs:

• Cable Length from Sub Panel to Distribution Board
• Type of Cable
• No of Conductor/Phase
• Size of Phase Conductor
• Size of Neutral Conductor
• Type of Race Way
• Phase Conductor Constant (C1)

• Neutral Conductor Constant (C2)
• F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
• F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
• M1(L-L) [M=(1/(1+F1)]
• M2(L-N) [M=(1/(1+F2)]
• Fault Current at Distribution Board Disconnection (L-L) [Isc X M1]
• Fault Current at Distribution Board Disconnection (L-N) [Isc X M2]

 Software: Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc) Version: – Developer: Jignesh Parmar Size: 85 Kb Price: Free Download: Right here | Video Courses | Membership | Download Updates

1. Pol Sanahuja
Apr 20, 2020

Is it possible that in the base MVA method tab there is an error in the calculation of fault current at Main LT Panel?

I think that there is an error because the impedance of the transformer is not added to the impedance used for the calculation and I’m getting results like 2 000 KA -> 2 000 000 A

2. Romell Bojie Belleza
Apr 15, 2020

Good day Edward could you pls send me a copy of short ckt current calculation at various point of electrical circuits in excel..thank you

3. Felipe Rengifo
Apr 15, 2020

Un saludo

4. Abir Hasan
Apr 14, 2020

[email protected]
regards

5. Chris Dodds
Sep 09, 2019

All: Where the system peak fault current and the cable diameter are known, the formula featured in the below Article, excerpted from the international standard IEC 61914, can be used to calculate the forces between two conductors in the event of a 3 phase fault in order to specify the correct type of cable cleats.

IEC 61914 – Cable Cleats & Short Circuit Protection Calculations
https://www.powerandcables.com/iec-61914-cable-cleats-short-circuit-protection/

Chris Dodds
Thorne & Derrick http://www.powerandcables.com

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