the right size for electrical cable

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Anonymous Poster	the right size for electrical cable 09/22/2008 7:00 PM
	It may be a simple question.I'm not in the electrical side but there is one deep well facility newly installed in our section. The Electrical authority has installed a 120 mm squared size of cable( a 4 cored copper ) to give power to our deep well ( with submersible motor)having a capacity of 55kw and with 380 volts rate. The diatance of the deep well location from transformer to the control panel is 300 meter. Is it right that 120 mm squared size of cable installed for that facility? Can you guys out there give me the right information of cable size and the allowable % of voltage drop, for copper wire particularly? Also the right formula for getting the voltage drop for a certain materials. Thanks a lot. edbesas
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Sparkstation Guru Join Date: Nov 2007 Location: Christchurch, (The Garden City), South Island, New Zealand Posts: 4395 Good Answers: 230	#1 Re: the right size for electrical cable 09/22/2008 7:11 PM
	Hello "Guest" You need to advise the type of cable structure, before a proper answer may be given: Excelene Polythene Steel wire armour Location/Country etc - Advise.... Reply here, with Kind Regards.... __________________ "The number of inventions increases faster than the need for them at the time" - SparkY
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Anonymous Poster	#4 In reply to #1 Re: the right size for electrical cable 09/24/2008 1:42 AM
	Yeah yeah yeah, same old garbage from you again. Was there not sufficient information in the original post for you to google ? Del
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#2 Re: the right size for electrical cable 09/23/2008 3:32 AM
	Please see previous posts on volt drop and cable sizing, otherwise get a trained and qualified professional (like an electrician) to do it for you. __________________ jack of all trades
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V.I.Abraham Guru Join Date: May 2007 Location: Pune , India Posts: 875 Good Answers: 42	#3 Re: the right size for electrical cable 09/23/2008 10:12 AM
	Hi Guest, You state that you are not an electrical person and the electrical authority has installed the cable. Then why you are doubting their competence? In every country the electrical job has to be carried out under the direct supervision of a competent qualified electrical engineer as a mandatory safety rule. They are responsible to ensure the safety of the equipment and men operating the system.They are accountable for that. So leave electrical job to authorised electrical engineer. The selection of a cable is highly technical matter and need proper calculation depending up on type of cable, system voltage laying conditions, weather conditions of the location and many other de rating factors.
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horace40 Guru Join Date: Jan 2006 Location: Tamworth, UK. Posts: 1782 Good Answers: 45	#5 Re: the right size for electrical cable 09/24/2008 4:01 AM
	You say 'installed' - well does the pump work as you want it to? What is your concern? __________________ When arguing, remember mud-slinging = lost ground.
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coconutpete Power-User Join Date: Feb 2007 Location: Suva Fiji Islands Posts: 229 Good Answers: 3	#6 Re: the right size for electrical cable 09/24/2008 5:23 PM
	Dont worry 120mm is heaps even allowing for DOL starting the voltage drop is less than 2% when the pump is running. What I would like to know is why would you doubt the local electrical authority? __________________ "Multa ferunt anni venientes commoda secum, Multa recedente adimiunt". (The years as they come bring many agreeable things with them; As they go they take many away).
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Anonymous Poster (1); coconutpete (1); horace40 (1); jack of all trades (1); Sparkstation (1); V.I.Abraham (1)

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