SCOPE: The specification covers … LV Cable Data – Open Electrical . These are Normal maximum continuous current rating, Over-current rating, Short- Circuit rating. The break down voltage of undamaged insulation is far higher than the working voltage. 165 18 reduce the cable current carrying capacity. the 90c thing is most use for a mixed route - so the ends may be better cooled than the middle for example. A temperature a couple of degrees different from expectation is not a major problem. Item (2) – 1 Core 630mm2 Cu 19/33 (36) kV TR-XLPE insulated underground cable without lyledunn: 11kV Cables XLPE 3 Core 185sqmm BS6622 Nexans Nexans bs6622 Cable 11KV XLPE 3 CORE 185MM². Take a look at table 6 in BS EN 61439 - that should tell you that the allowable temperature rise on terminals is 70K (usually the ambient is 20C) - so compliant switchgear could easily be operating at 90C terminal temperature when at full load - which will clearly melt PVC. mm… XLPE Insulated Power Cables – Universal Cable. Min. 165 0 obj <> endobj The usual bonding methods are described below: Both-ends bonding A system is both ends bonded if the arrangements are such that the cable sheaths provide path for circulating currents at normal conditions. The built-up area, including offices and manufacturing plants, is more than 97,500 sqm. This includes PVC sheathed single core cables - XLPE/PVC/AWA/PVC - and multicore cables - XLPE/PVC/SWA/PVC - with a cable current ratings of 0.6/1kV and 1.9/3.3kV. Therefore, by reducing or eliminating the metallic sheath currents through different methods of bonding, it is possible to incresase the load current carrying capacity (ampacity) of the cable … 0000002295 00000 n Power cables are mainly used for power transmission and distribution purpose. medium voltage cables up to 36 KV, with XLPE insulation to IEC 60502-2 and BS 6622. Albeit this does still leave us in the situation where we should assume 70C unless we can confirm that  higher conductor operating temperatures will be sustainable. The Institution of Engineering and Technology is registered as a Charity in England & Wales (no 211014) and Scotland (no SC038698). Peruvian Customers Visited Our Company to Purchase Overhead 04-16. conjecture can sometimes  be beaten  by real measurements, in the form of those stickers that change colour to indicate peak temperature, as a sort of high tide marker- only really good on large diameter stuff, but then on large diameter lugs and bussbars,  the cost of rework and or over sizing becomes  most significant. Henan Jiapu Cable Received Export Orders of South Africa 03-28 | Home > TECHNOLOGY > Product Knowledge > Current Carrying Capacity of BLV Wire. Overall Diameter . 2.2. technical specification for 11/22/33 kv nominal voltage ht xlpe power cables … 5. continuous a.c. current capacity: Go to Contents Page – DUCAB. BS7671 table 443.2. 0000004855 00000 n Eland Cables is a leading supplier of BASEC-approved low voltage armoured cables manufactured in accordance with British Standard BS5467 and BS6724. So as an example, a 4 core 150.0mm² XLPE/SWA cable clipped direct is rated at 386 Amps from table 4E4A column 3 in BS7671:2018. The electric power losses in a cable circuit are dependent on the currents flowing in the metallic sheaths of the cables. 33 kV cables. Current carrying capacity Voltage drop single phase a.c. Hi, I keep coming across the same issue in regards to the current carrying capacity of a XLPE/SWA cable. As an aside, there may be nothing wrong with a 306A cable protected by a 355A fuse if overload protection is not required. & 33 kV , multi core , cross linked polyethylene insulated power cables by road/rail to the designated Store Centers in the State of Maharashtra. The fixed wiring of a 230/400V installation up to and including the sockets is supposed to be able to withstand 4kV transients. Help 0.6/1 KV Low Voltage XLPE Insulated Power Cables Page - 41 5 Halojen Free, Fire Retardant and Fire Resistant Cables Page - 57 6 3 ... Current carrying capacity in. International Tender for 33KV 1*300 mm2 XLPE Copper Cable,1* 08-05. Thickness ofPVC Inner Losses in cables _____ 2.5. 1.2 Goods to be Supplied Cables to be supplied: Item (1) – 1 Core 630mm2 Cu 19/33 (36) kV TR-XLPE insulated underground cable incorporating optic fibres with 13.7kA nominal short circuit duty of cable screen. Nominal Size of as per IS 8130/84 Sq.mm. For advice and guidance on cable specification, appropriate 33kV cable accessories, and installation calculations, please speak to one of our technical experts in The Cable Lab who will be happy to assist you with your specific project and application. 0000007615 00000 n XLPE insulated cable is very small in dielectric losses. Aluminium and Copper Current Carrying Capacity Calculation Chart in Sqmm: Aluminium and copper are the most available material in the earth, but the copper conductor carries 40% extra current than the aluminium conductor.. Current-carrying capacity XLPE-insulated MV cables Permissible short-circuit temperatures and rated short-time current densities . mmand 33/33kV(UE)-120 to 400 sq.mm 0.00 0.00; Current ratings for Building wires & Flexibles, in Amps. 33kV single core cables are available in the following cable conductor cross section areas: 70sqmm, 95sqmm, 120sqmm, 150sqmm, 185sqmm, 240sqmm, 300sqmm, 400sqmm, 500sqmm, 630sqmm, 800sqmm, … 4CX16 SQ MM STEEL WIRE ARMOURED XLPE CABLE 0.6/1 KV shipped 06-02. 1: 33kvtrip3x95al 95 stranded 38 33kv 4080 82.08 33kvtrip3x185al 185 stranded 43 33kv 5244 92.88 triplex cable 11kv and 33kv – current carrying capacity max voltage rating nominal cross sectional area (mm2) continuous current rating in ground amps in ducts amps in air amps 11kv 95 250 230 280 11kv 185 360 331 425 11kv 300 475 437 580 For cables having flexible conductors see section 2.4 of this appendix for adjustment factors for current-carrying capacity and voltage drop. Go to Contents Page … Advantages of XLPE Insulated Cables … It is the current carrying component of the cable. Metallic sheath types _____ 3. The fixed wiring of a 230/400V installation up to and including the sockets is supposed to be able to withstand 4kV transients. 0 0000014800 00000 n Large size solid conductors are made of aluminium. Medium Voltage Underground Cables 4 CABLE l Cable power circuit design 7 n Conductor 7-8 n Conductor screen 8 n Insulation 8 n Insulation screen 8-9 n Metallic screen 9-10 n Outer protective sheath 10-11 l Table of cable elements 12 l Cable constructions 13 l Cable drums 14 l Cable tests following production 15 ACCESSORIES l Introduction 16 l Connectors and lugs 16 But the cost to sqmm points of view, i.e the cost of 3 core 35sqmm aluminium cable has Rs 1.6per sq. Current carrying capacity (rating) The current ratings are selected from Tables 4 to 21 in AS/NZS 3008 (2009). 0000004966 00000 n (Note– Current carrying capacity of cable should be higher than that of actual load for longer life of cable) Ex. | It is based on cable type, insulation type and the cable installation method. with Copper cond. 33kV Cable Technical Advice. I always use the de-rated current carrying capacity when I am not sure if all associated equipment is rated at  90°c, which is all the time. Correct, although Thermosetting cables (4E4A) are rated at 90 degrees there is very little equipment that can be connected at this temperature as you rightfully pointed out. And if you believe that line from whatever cowboy film it was said at a card game that "a Smith and Wesson beats four aces"  (*) then in much the same way a. I agree absolutely with OMS above. IEC 60364-5-52 Cable Installation Arrangements . XLPE Cable Single core, 0.6/1kV X-90 insulated, PVC sheathed to AS/NZS 5000.1, and Manufactured to PVC Best Practice Guidelines. The cable rating is classified under three headings. The cable rating is classified under three headings. Although I assume individual equipment standards will have more to say. 0000003677 00000 n It is based on cable type, insulation type and the cable installation method. Looking at the stickers every xx months reassures everyone it has not been overheating yet. Cables can offer a broad range of both XLPE cables (up to 500 kV) and oil-filled cables (up to 400 kV) as well as their accessories. Medium voltage 33 kV single core cable XLPE-AL Halogen free … ELECTRIC CABLE 33000V nkt cables 1X185+50 XLPE-AL 33 kV >>> … Current carrying capacity G) … 630 sq mm cable | Copper Cable,Armoured… Current Carrying Capacity of 630 Sq mm Cable – … XLPE Aluminium 11kV laid over … (XLPE) INSULATED CABLES 1. Legal Notices. .. storm of acrimony and argument based entirely on "What Iffery". In Your Electrical notes ( Rev 5,page 10), Thumb rule for cable current capacity … Min. I always use the de-rated current carrying capacity when I am not sure if all associated equipment is rated at 90°c, which is all the time. Aluminium Copper A standard 4 core 150.0mm²  PVC/SWA is rated at 306 Amps from table 4D4A column 3. For 2 core - single phase a.c., 3 & 4 core - three phase a.c. - ratings do not apply if the cable is protected by a semi-enclosed fuse to BS3036. startxref 33kvtrip3x95al 95 stranded 38 33kv 4080 82.08 33kvtrip3x185al 185 stranded 43 33kv 5244 92.88 triplex cable 11kv and 33kv – current carrying capacity max voltage rating nominal cross sectional area (mm2) continuous current rating in ground amps in ducts amps in air amps 11kv 95 250 230 280 11kv 185 360 331 425 11kv 300 475 437 580 Have you asked many switch gear manufacturer's if they would warrant such a situation? Typical sample of a 2500mm2 500 kV XLPE cable Modern XLPE cables consist of a solid cable core, a metallic sheath and a non-metallic outer covering. The cable core consists of the Hi, I keep coming across the same issue in regards to the current carrying capacity of a XLPE/SWA cable. For cables having flexible conductors see section 2.4 of this appendix for adjustment factors for current-carrying capacity and voltage drop. EHV XLPE Cable: 3.8 / 6.6 KV(6.6 KV Earthed) Single Core AL/COPPER COND, XLPE INSULATED CABLES As per IS:7098 (Part-II) Cross-sectional area (Sq MM) ARMOURED CABLE Overall Diameter (mm) Normal Current Rating in Amps Short Circuit Current Rating for 1Sec.duration in K. Amps Aluminum Conductor Copper Conductor Aluminum Copper Ground Duct Air Ground Duct… <<07AE386AD3D30F48A7B03AFD6035A537>]>> These losses are in general installation, the concern is mechanical. Where it is intended to group a cable in this table with other cables, the cable should be rated at the lowest of the maximum operating temperatures of any of the cables in the group (see Regulation 512.1.5). OMS: Item (1) – 1 Core 630mm2 Cu 19/33 (36) kV TR-XLPE insulated underground cable incorporating optic fibres with 13.7kA nominal short circuit duty of cable screen. Tables 4 to 21 are based on an ambient temperature of 40°C and a ground temperature of 25°C. Providing the cable can carry 20 amps then it is not possible to overload the circuit and thus the design can be based on fault current protection by employing the adiabatic formula. xref 18/30 (36) KV - SINGLE CORE, XLPE INSULATED, PVC SHEATHED, SCREENED, UNARMOURED CABLES. They are for single circuit with the standard conditions I had not considered it from that angle, i.e. Single Core POLYCAB XLPE Cables 3.8/6.6kV(E), 6.6/6.6kV(UE), 6.35/11kV(E) 0 ... -70 to 400 sq.mm, 12.7/22kV(E), 19/33kV(E)-95 to 400 sq. Ease of Installation XLPE cable withstands smaller radius bending and is lighter in weight, allowing for easy and reliable installation. The excellent resistance to thermal deformation and the excellent aging property of XLPE cable permit it to carry large current under normal (90 oC), emergency (130 oC) or short circuit (250 C) conditions. The cable conductors can be made of copper or aluminium, depending on customer’s preference or current carrying capacity. Maximum mass supportable by twin flexible cord (see reg. International Tender for 33KV 1*300 mm2 XLPE Copper Cable,1* 08-05. Aluminium and Copper Current Carrying Capacity Calculation Chart in Sqmm: Aluminium and copper are the most available material in the earth, but the copper conductor carries 40% extra current than the aluminium conductor.. Inductance, Inductive reactance _____ 2.4. View the complete Prysmian range of MV-HV Cables (6.6kV 11kV 33kV).. 33kV MV Cables BS6622/BS7835 MV HV Cables, Joints, Terminations & Connectors. 3 SCHEDULE 'A' TECHNICAL SPECIFICATION FOR 11/22/33 kV NOMINAL VOLTAGE HT XLPE POWER CABLES (SPECIFICATION NO.MM/I/HTXLPE/2006) 1. Cable construction may be various types depending on voltage ratings, conductor size and type, sheath type etc. The electric power losses in a cable circuit are dependent on the currents flowing in the metallic sheaths of the cables. meter and copper conductor has Rs 3.0 per sqmm. wallywombat: current carrying capacity of 11kv xlpe cables Power Cable. 0000004389 00000 n 33kV Cable Technical Advice. Cu. Current carrying capacity table (in Amps) - 19/33kV Single Core - solid bond - Underground Underground direct flat touching Underground direct flat spaced Al. CONTINUOUS CURRENT CARRYING CAPACITY The tabulated current rating have been calculated in accordance with IEC 287. For advice and guidance on cable specification, appropriate 33kV cable accessories, and installation calculations, please speak to one of our technical experts in The Cable Lab who will be happy to assist you with your specific project and application. Take a look at table 6 in BS EN 61439 - that should tell you that the allowable temperature rise on terminals is 70K (usually the ambient is 20C) - so compliant switchgear could easily be operating at 90C terminal temperature when at full load - which will clearly melt PVC. ♦ See Cable Jointing Tools for 33kV cables. | On Amtech, there is a drop down to run these cables at 70 degrees, but Amtech simply uses table 4D4A for the calculation which is a shame as the thermosetting cables can dissipate heat better than thermoplastic and therefore could get a higher current carrying capacity in theory. XLPE insulated cable is stronger resistant to severe working conditions like chemicals, acids, oils. | 0000000656 00000 n 0000012910 00000 n ��*D�4?�-�b�g�à��C�!�a^c8��U��(����\�T�2�e�'�nц���;X tv�&15ԝ��`m�����A��w�zC��s CURRENT RATINGS The current ratings are thoroughly presented in ERA 69-30 part V: CURRENT RATING STANDARD FOR DISTRIBUTION CABLES. Net Weight Standart delivery lenght (maks.) Tables 4 to 21 are based on an ambient temperature of 40°C and a ground temperature of 25°C. Current-carrying capacity: tables (Extract from VDE 0298-4 06/13 tables: 11, 17, 18, 21, 26 and 27) Current-carrying capacity, cables with a nominal voltage up to 1000 V and heat resistant cables VDE 0298-4 06/13 table 11, column 2 and 5 Eland Cables is a leading supplier of BASEC-approved low voltage armoured cables manufactured in accordance with British Standard BS5467 and BS6724. Release time:2018-03 … These cables shall be suitable for the 3 phase AC-50 Hz system with the nominal voltage of 11/22/33 kV which may reach maximum of 12/24/36 kV respectively. Outer Copper cable Aluminium cable Sheath Nominal cross section Insulation 50 70 95 120 150 185 240 300 0.387 0.268 0.193 0.153 0.124 0.0991 0.0754 0.0601 Current carrying capacity ** mm2 ELECTRICAL CHARACTERISTICS DC Resistance at 20˚C* Underground Cable Cables in duct Alu Cables in air Nominal cross section Nominal inductance Ω/Km 0.641 0.443 0.320 0.253 0.206 0.164 0.125 0.100 Ω/Km 0.435 “KEI” Three Core Aluminium & Copper Conductor, XLPE Insulated, Armoured Cable Conforming to IS 7098 Part-2/1985 Voltage Grade : 1.9 / 3.3 kV (Unscreened) (E) 3.3 & 3.3 kV (Unscreened) (UE) WEIGHT & DIMENSIONS . 0000001800 00000 n So as an example, a 4 core 150.0mm² XLPE/SWA cable clipped direct is rated at 386 Amps from table 4E4A column 3 in BS7671:2018. Privacy Statement �� �,����^"�~ � ` 1� Accessibility Lots of situations 50. CE marked kit for connection to the mains should be type tested by the makers and declared to meet IEC 61000 - 4. These losses are … CURRENT RATING FOR XLPE LAND CABLE SYSTEMS Current rating for single-core cables, ampères . H�dRMO�0��W�����}��"7@H����m��M��F������=twO�_G�n���x��Z��G�z���fg���H4�z���9'C��� �*�~&D�wd;E(�F�X6 �Vc�Xvm��9��-. These cables shall primarily be designed BS6622 Cable Description: CU/XLPE/SWA/PVC 11kV 3X 185 – Electric MV cables with copper conductors, semi conductive conductor screen, XLPE insulation, semi conductive insulation screen, copper tape metallic screen of each core, PVC bedding, galvanized steel wires armour (SWA) and PVC … Current carrying capacity (rating) The current ratings are selected from Tables 4 to 21 in AS/NZS 3008 (2009). The only thing I can think of is maybe life safety equipment, but I’d still want the cable sized to breaker I think. I think that this matter encapsulates the conflict between, on the one hand, being strictly compliant, and therefore conservative; and on the other hand using engineering judgement. This includes PVC sheathed single core cables - XLPE/PVC/AWA/PVC - and multicore cables - XLPE/PVC/SWA/PVC - with a cable current ratings of 0.6/1kV and 1.9/3.3kV. 0000003017 00000 n The excellent resistance to thermal deformation and the excellent aging property of XLPE cable permit it to carry large current under normal (90 oC), emergency (130 oC) or short circuit (250 C) conditions. Current carrying capacity of XLPE/SWA cables, The Institution of Engineering and Technology. Short-circuit current capacity _____ 2.7. OMS: Approx. ... if robustness was not a concern, then look at the thin varnish-like insulation on wire used for motor and transformer windings. 182 0 obj<>stream 0000001356 00000 n Conductor DC. This will cause losses in the screen, which reduce the cable current carrying capacity. trailer BS6622 Cable Description: CU/XLPE/SWA/PVC 11kV 3X 185 – Electric MV cables with copper conductors, semi conductive conductor screen, XLPE insulation, semi conductive insulation screen, copper tape metallic screen of each core, PVC bedding, galvanized steel wires armour (SWA) and PVC … “KEI” Single Core Aluminium & Copper Conductor, XLPE Insulated, Unarmoured & Armoured Cable Conforming to IS 7098 Part-2/1985 Voltage Grade : 19 / 33 kV (E) WEIGHT & DIMENSIONS Nominal Nominal Unarmoured Cable Round Wire Armoured Cable CURRENT RATING Size of Thickness Nom. | Cookies Hi, I keep coming across the same issue in regards to the current carrying capacity of a XLPE/SWA cable. Form of Conductor Stranded Nom. These are Normal maximum continuous current rating, Over-current rating, Short- Circuit rating. Earthing methods, induced voltage _____ 2.6. QUALITY SYSTEM Designed, manufactured and … x�b```����I� cc`a���p�8�������������i�x������G6��jL�;�F��G��O.��T��͵9��yvQ����77�YNɨ|������Z��D�7�$�[=��>7'&[A�%=Y�E�((k ]&�|b"GPUTը� r�l\�S��,�Ū"h�.�0%��I��sX��" SB&M�K�L9�:=a��� .A�F����T�r����)@�y,�5pA]F*H͏���> �h�S�rѮ�9����?kZsC��A���Q�B�u�<8]=}V�A(����T�!��� (�� �b)f(�����f0�W@YP (�--�@����0���hI����FAA�:F8��t Is that a requirement of BS 7671 or product standards? I think you are suggesting the opposite ie the cable is at 90C and influencing the terminals... many manufacturers struggle to comply with the requirements (and thus limit the cable temp to 70C, to give the switchgear some headroom. What is current carrying capacity of 10 sq. Approx. endstream endobj 166 0 obj<>/Metadata 163 0 R/Pages 157 0 R/Type/Catalog>> endobj 167 0 obj<>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>>>/Type/Page>> endobj 168 0 obj[/ICCBased 176 0 R] endobj 169 0 obj<> endobj 170 0 obj<>stream Therefore, by reducing or eliminating the metallic sheath currents through different methods of bonding, it is possible to incresase the load current carrying capacity (ampacity) of the cable … olex.customerservice@nexans.com. XLPE/SWA/PVC 4-CORE BS 5467 600/1000 V XLPE insulated steel wire armoured and PVC sheathed cable with copper conductors. | How many would? It is an assembly of one or... Bare Overhead Conductor. 19/33kV Single Core un-armoured XLPE insulated cables. But the cost to sqmm points of view, i.e the cost of 3 core 35sqmm aluminium cable has Rs 1.6per sq. Attachment 2 – Underground Cable Current Rating ... works, supply and delivery of single core 19 / 33kV Copper / TR-XLPE underground cable. Al. Current Carrying Capacity . XLPE Cable System Standards _____ 4. This is a big difference! 0000001255 00000 n Where it is intended to group a cable in this table with other cables, the cable should be rated at the lowest of the maximum operating temperatures of any of the cables in the group (see Regulation 512.1.5). TECHNICAL SPECIFICATION FOR XLPE POWER CABLE. 0000001764 00000 n Ease of Installation XLPE cable withstands smaller radius bending and is lighter in weight, allowing for easy and reliable installation. weight, dimension data & current carrying capacity of cables 3.8 / 6.6 kv (e) ht xlpe single core 16 6.35/11 kv (e) 6.6/6.6kv (ue) ht xlpe single core 17 11/11 kv (ue) ht xlpe single core 18 12.7/22 kv (e) ht xlpe single core 19 19/33 kv (e) ht xlpe single core 20 33/33 kv (ue) ht xlpe single core 21 The factory extension currently under construction measures over 47,000 sqm. meter and copper conductor has Rs 3.0 per sqmm. 0000001913 00000 n AREA Bahra Cables Company has a total land area of about 500,000 sqm at disposal. Dynamic forces _____ 2.8. Take a look at table 6 in BS EN 61439 - that should tell you that the allowable temperature rise on terminals is 70K (usually the ambient is 20C) - so compliant switchgear could easily be operating at 90C terminal temperature when at full load - which will clearly melt PVC. XLPE insulated cable has a higher current carrying capacity. What is the current capacity of an XLPE 33kV power cable? Consider a heater with a full load current of say 20amps. XLPE insulated copper connected to compliant switchgear can happily run at 90C - you would expect the external surface temperature of the cable to be around 80C, ...Pretty well any manufacturer providing BS EN 61439 compliant switchgear - although I think we are at cross purposes - I was pointing out that the switchboard terminals at full load may already be at 90C - and that impacts the cabling.