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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. Ayo Muritala
Jul 14, 2019

Hello sir,
I actually performed some physical tests on Power Transformers but I’m interested in the digital aspect and how I can deploy the use of algorithm. Also that I want to simulate the practical result onto the simulation model. I would need assistance on how to apply my result on the simulation platform.
I crave your indulgence to assist me to gain the knowledge.
I wish to send you the test results. My mail address is [email protected]
Thanks in anticipation.
Regards.

2. Tunde Alabi
Jul 09, 2019

Good day sir, please with winding test, ratio test and excitation test on transformer
how can I know the capacity of a transformer (KVA) without looking at the name plate.

3. Dennis ventura
Feb 10, 2019

Hi Sir Edvard can you also send this to my email [email protected] Thank you very much.

4. kiir tong deng
Jul 31, 2018

I need to join EEP memberships network ,for engineering purpose to upgrade my career as power engineer .

5. ANDRĂ‰S ELĂŤAS PĂ‰REZ LAGUNA
Jun 23, 2018

Buenos dĂ­as Ing. Edvard cordial saludo, quisiera saber cuando abra una hoja de cĂˇlculo de las que ofrecen en forma gratuita, por quĂ© me pide contraseĂ±a y si trato de buscarla me dice que debo pagar.
CĂłmo desbloqueola hoja en Excel para poder trabajar.

Ejemplo la hoja de Nivel de Cortocircuito?
Quedo atento a su respuesta
Feliz dĂ­a

6. VIJAYARAGHAVAN PONNAIYA
Oct 20, 2017

sir
kindly let me know the cable size calculation complete formula and explain how to use that formula .Even i want to know the various design aspects of electrical design of cable size ,cable selection,

7. Josh Shelton
Dec 01, 2016

Very handy tool. Would like to see the cables listed in AWG size also and standard measurements compared to metrics. I am an American, we are different, haha!

8. Edson Viana from Brazil
Nov 11, 2016

Hi Edvard, good afternoom

Please, do you have a sheet plan to short circuit in CC?

Best regards.

Edson

9. Rohit krishnan
Aug 31, 2016

Hey edward could you please send me a copy of the short circuit calculator xls. Your help would be very much appreciated. Thank You .

10. Bilal mohamed
Aug 15, 2016

Dear sir
i have three question

1-could i know the formula you used from which standard or code you take it ?
2- for Phase Conductor Constant , can you send me the catalogs which took from (because it different from country to other ) ?
3- Do you have an AWG cable size equivalent ? (whith mention your resource )

best regards

11. Senthilnathan
Mar 23, 2016

Sir,
Kindly send the excel tool for SC calculation as I am unable to download. My id: [email protected].. Thanks in advance..

Oct 17, 2015

Dear Edvard,
Request you to send me a copy of the excel file for Short CKT Calcs as I am unable to download from the link.
My mail id: [email protected]
Thanks & Regards,

13. Michael
Aug 31, 2015

you may also consider Short Circuit Analytic software program and mobile apps for short circuit fault current calculations. The program factors in both active and reactive parts of equipment impedance and takes into account fault current contributions from multiples sources including motors and generators:

14. srikanth
Jul 25, 2015

sir
kindly let me know the cable size calculation complete formula and explain how to use that formula .Even i want to know the various design aspects of electrical design of cable size ,cable selection,circuit breaker calculation,trays,etc.
as im new and working in construction field.kindly help me out

15. Chris Dodds
May 28, 2014

IEC 61914 covers the electrical engineering calculation for the correct selection and specification of cable cleats to retain power cables in the event of a short-circuit http://www.cablejoints.co.uk/blog/article/iec61914-cable-cleats-ellis-patents