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calculate the Isc short circuit current?

Created by: Sariq Salim at: 2/8/2014 8:46 AM (9 Replies)

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2/8/2014 8:46 AM	Rate (0)
Sariq Salim Posts: 31 Rating: (2)	Sir, How calculate the Isc short circuit current of switch gear? Regards, Sariq
Sariq Salim Posts: 31 Rating: (2)
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2/8/2014 2:36 PM	Rate (0)
Sariq Salim Posts: 31 Rating: (2)	Still Surprised. No one can answer on it. Guys help me out.....!!!!!!!!!!!
Sariq Salim Posts: 31 Rating: (2)
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2/8/2014 10:06 PM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 1/16/2026 Posts: 12481 Rating: (2722)	Hello Shariq; I have found this PDF to be informative: Calculation of short-circuit currents - Schneider There are many other documentson the subject on the web, try Google or Bing to locate them. I do not remember seeing any from Siemens, but I could be wrong. Hope this helps, Daniel Chartier

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2/9/2014 10:13 AM	Rate (0)
Sariq Salim Posts: 31 Rating: (2)	Thanks daneil.... Did you have any idea about Selection of earthing cable for internal LV Panel. Please suggest if you can. Regards, Sariq
Sariq Salim Posts: 31 Rating: (2)
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This contribution was helpful to 2 thankful Users jeet2907 Er.digu

3/5/2014 9:58 AM	Rate (0)
srrr-in Posts: 7 Rating: (0)	Dear Shariq, First of all you need to find out impedance in the circuit and then use the below formula Isc = Full load current / % Impedance (Z). Regards Srrr
srrr-in Posts: 7 Rating: (0)
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5/12/2014 12:58 PM
jeet2907 Posts: 235 Rating: (52)	Shariq0077 Thanks daneil.... Did you have any idea about Selection of earthing cable for internal LV Panel. Please suggest if you can. Regards, Sariq Dear shariq, Hope below link i useful for you. http://www.electrical-installation.org/enwiki/Sizing_of_protective_earthing_conductor
jeet2907 Posts: 235 Rating: (52)
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5/21/2014 10:39 AM
ashishmistry390 Posts: 21 Rating: (0)	Shariq0077 Sir, How calculate the Isc short circuit current of switch gear? Regards, Sariq Dear Sir, Please find the attahced limk. http://www2.schneider-electric.com/documents/technical-publications/en/shared/electrical-engineering/electrical-know-how/low-voltage-minus-1kv/ect158.pdf Regards, Ashish Mistry
ashishmistry390 Posts: 21 Rating: (0)
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5/21/2014 12:28 PM
Chetan2490 Posts: 149 Rating: (16)	Shariq0077 Sir, How calculate the Isc short circuit current of switch gear? Regards, Sariq Dear sariq , In shortIsc = Full load current / % Impedance (Z).
Chetan2490 Posts: 149 Rating: (16)
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5/25/2014 7:30 PM
@nkur Posts: 202 Rating: (16)	Shariq0077 Sir, How calculate the Isc short circuit current of switch gear? Regards, Sariq Hi there Do correct me if i am wrong but doesnt the Isc of Switch gear value depend on the Isc rating of the incomer??It is taken one step below the Incomers rating.
@nkur Posts: 202 Rating: (16)
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5/26/2014 6:21 AM
jeet2907 Posts: 235 Rating: (52)	@nkur Shariq0077 Sir, How calculate the Isc short circuit current of switch gear? Regards, Sariq Hi there Do correct me if i am wrong but doesnt the Isc of Switch gear value depend on the Isc rating of the incomer??It is taken one step below the Incomers rating. Yes i am agree with you the switchgear KA should be lower than the main incomer.Bcoz if we select the switchgear KA higher than the main incomer,then during short circuit main incomer get trip or damage and due to this whole system should be crashed or say shutdown.
jeet2907 Posts: 235 Rating: (52)
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