Minimum Height Required for 36 kV XLPE Cable Termination

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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	Minimum Height Required for 36 kV XLPE Cable Termination 04/08/2019 2:34 AM
	What is the minimum required space - from the gland plate to the terminals - inside a switchgear cable chamber, for a 36kV XLPE Cable? Is there a Standard for the same?
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: Minimum Height required - from gland plate to the terminals - for cable termination for 36kV XLPE Cable 04/08/2019 3:59 AM
	The minimum space is that needed to bend and terminate the cables without kinking the insulation or other mechanical damage to the cable. It is a function of cable conductor and insulation size and stiffness. Minimum recommended bending radii can be had from the cable manufacturer. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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IQ Guru Join Date: Feb 2013 Posts: 2004 Good Answers: 31	#7 In reply to #1 Re: Minimum Height required - from gland plate to the terminals - for cable termination for 36kV XLPE Cable 04/10/2019 7:20 AM
	As a rule, 20 times the diameter of the cable gives the minimum bending radius. Once installed this can be reduced to 15 times the cable OD. Nowadays, to save on trenching and squeezing bends underneath switchgear they now allow 10 times the cable OD. This I find disagreable and absurd as anyone who can bend a 1200mm2 single core to that radius, or a 630mm2, 3 core, SWA to that bend needs his head read or has great medical cover. Quickest method to check a bend, measure the diameter of the core of the cable drum and that is the minimum bend allowed for that cable.
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#2 Re: Minimum Height Required for 36kV XLPE Cable Termination 04/08/2019 7:24 AM
	Are you using heat shrink with terminal boots or using gel fill? __________________ The reports of my death are greatly exaggerated.
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#4 In reply to #2 Re: Minimum Height Required for 36kV XLPE Cable Termination 04/09/2019 1:34 AM
	Heat Shrink
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15600 Good Answers: 981	#3 Re: Minimum Height Required for 36 kV XLPE Cable Termination 04/08/2019 12:08 PM
	No there is not a standard because not all cables are made the same. Utilize the data from the cable manufacturer. __________________ "Don't disturb my circles." translation of Archimedes last words
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IQ Guru Join Date: Feb 2013 Posts: 2004 Good Answers: 31	#5 Re: Minimum Height Required for 36 kV XLPE Cable Termination 04/09/2019 10:18 AM
	Yes, there actually is a standard that most countries use. There is also an NRS standard for terminations inside switchgear and if you are using a heatshrink termination, you should know the measurements shown on the instruction sheet is minimum dimension allowable. 33kV(36kV), single core or 3 core is 960mm from lug hole to gland plate minimum distance required. No, you will not get that from gear manufacturers. If this was screened PILC, you can go to 690mm. That is what gear manufactured will give you. If you stipulate the gear is for XLPE cable they will charge higher for the gear due to more metal being used. But as for standards and NRS's they exist.
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IQ Guru Join Date: Feb 2013 Posts: 2004 Good Answers: 31	#6 In reply to #5 Re: Minimum Height Required for 36 kV XLPE Cable Termination 04/09/2019 12:12 PM
	I should have added, install a gland plate extension if the space is short. See Raychem (TYCO, {taking your company over}) for gland extenders. http://www.cableservices.co.uk/cable-terminations/Tyco-Box-Glands-Insulators.pdf
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#8 Re: Minimum Height Required for 36 kV XLPE Cable Termination 04/10/2019 12:24 PM
	Once can always use non-flat gland plates, of course. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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electricalexpert65 (1); IQ (3); PWSlack (2); redfred (1); TonyS (1)

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