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calculation of earth cable size

Created by: putta at: 4/3/2014 5:53 AM (8 Replies)

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4/3/2014 5:53 AM	Rate (1)
putta Posts: 77 Rating: (1)	Dear sir, please help me how to calculate the earth cable size? their is a any forumla for the earth cable calculation? our machine control panel load details: pre fuse current is.:200A machine out put current is.:182A. pleae help me sir, regards putta
putta Posts: 77 Rating: (1)
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4/3/2014 4:00 PM	Rate (0)
Ste39 Platinum Member Joined: 1/21/2013 Last visit: 10/23/2024 Posts: 4620 Rating: (708)	Hi putta, Have a look our friend dChartier if that's what you mean or go ahead in the post: calculate the Isc short circuit current?
	Last edited by: Ste39 at: 4/3/2014 4:03 PM
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4/3/2014 4:57 PM	Rate (1)
poya_xp Posts: 167 Rating: (4)	Hi look at this web site: http://www.electrical-installation.org/enwiki/Sizing_of_protective_earthing_conductor if it helps you or not let me know. Regards, Poya
poya_xp Posts: 167 Rating: (4)
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5/21/2014 7:21 AM
ashishmistry390 Posts: 21 Rating: (0)	putta Dear sir, please help me how to calculate the earth cable size? their is a any forumla for the earth cable calculation? our machine control panel load details: pre fuse current is.:200A machine out put current is.:182A. pleae help me sir, regards putta That is was Statter was saying....you need to know the loads and maximum fault level. The maximum fault level for transformer is restricted by its impedance, which is measured in a simple short circuit test at the factory, and printed on the TX name-plate. The secondary is shorted and the voltage increased at the primary until full load current flows in the primary. The impedance is this applied voltage over the rated voltage expressed as a percentage. i.e. A TX rated at 1MVA with a measured impedance of 5% will have a maximum fault level of: 1MVA * 100 / 5% = 20MVA Large power TXs often have resistors to reduce earth fault current. If the neutral is the same size as a phase conductor, you can't go wrong. You can reduce the CSA to save money if the load specifically allows it, as Statter explained.
ashishmistry390 Posts: 21 Rating: (0)
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5/21/2014 9:10 AM	Rate (0)
Madhava Silver Member Joined: 11/26/2011 Last visit: 6/29/2023 Posts: 508 Rating: (23)	Help I found by GooglingHere

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5/22/2014 1:41 PM
Chetan2490 Advanced Member Joined: 5/12/2014 Last visit: 9/9/2020 Posts: 149 Rating: (16)	ashishmistry390 putta Dear sir, please help me how to calculate the earth cable size? their is a any forumla for the earth cable calculation? our machine control panel load details: pre fuse current is.:200A machine out put current is.:182A. pleae help me sir, regards putta That is was Statter was saying....you need to know the loads and maximum fault level. The maximum fault level for transformer is restricted by its impedance, which is measured in a simple short circuit test at the factory, and printed on the TX name-plate. The secondary is shorted and the voltage increased at the primary until full load current flows in the primary. The impedance is this applied voltage over the rated voltage expressed as a percentage. i.e. A TX rated at 1MVA with a measured impedance of 5% will have a maximum fault level of: 1MVA * 100 / 5% = 20MVA Large power TXs often have resistors to reduce earth fault current. If the neutral is the same size as a phase conductor, you can't go wrong. You can reduce the CSA to save money if the load specifically allows it, as Statter explained. Dear, Please refer below link http://www.electrical-installation.org/enwiki/Sizing_of_protective_earthing_conductor

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5/25/2014 7:08 PM
@nkur Posts: 202 Rating: (16)	Ste39 Hi putta, Have a look our friend dChartier if that's what you mean or go ahead in the post: calculate the Isc short circuit current? Hi there I need you help to understand this doent the Isc current depends on the Incomer Isc???what putta is asking is for the earthing calcullation for cable selection
@nkur Posts: 202 Rating: (16)
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5/25/2014 7:10 PM
@nkur Posts: 202 Rating: (16)	putta Dear sir, please help me how to calculate the earth cable size? their is a any forumla for the earth cable calculation? our machine control panel load details: pre fuse current is.:200A machine out put current is.:182A. pleae help me sir, regards putta Hi there I would like to add to the question to it what is the procedure fo selection of earthing busbar in construction panel?usually its taken half of the Neutral Busbar but whats the exact calculation???
@nkur Posts: 202 Rating: (16)
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5/26/2014 7:06 AM	Rate (0)
Ste39 Platinum Member Joined: 1/21/2013 Last visit: 10/23/2024 Posts: 4620 Rating: (708)	@nkur Ste39 Hi putta, Have a look our friend dChartier if that's what you mean or go ahead in the post: calculate the Isc short circuit current? Hi there what putta is asking is for the earthing calcullation for cable selection Hello @nkur, There are many other document on the web look there: 5.4.5 - Protective conductor cross-section calculation - TLC Electrical ...

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