Single Core Cables To IEC 60502
Single Core Medium Cable to IEC 60502-2
Application:
The single core cables are designed for distribution of electrical power with nominal voltage Uo/U ranging from 1.8/3KV to 26/35KV and frequency 50Hz. They are suitable for installation mostly in power supply stations,Website:, indoors and in cable ducts, outdoors, underground and in water as well as for installation on cable trays for industries, switchboards and power stations.
Standards:
IEC 60502 Part 1(1.8/3KV)IEC 60502 Part 2(3.6/6KV to 18/30KV
Conductor:
Plain annealed copper or aluminium complying with IEC 60228/BS 6360. Copper conductors shall be stranded (class 2) and aluminium conductors shall be either solid or stranded (class 2).
Conductor Screen:
The conductor screen consists of an extruded layer of non metallic, semi-conducting compound firmly bonded to the insulation to exclude all air voids. The conductor screen is not necessary for both PVC and EPR/HEPR insulated 1.8/3KV and 3.6/6KV cables.
Insulation:
Insulation is of polyvinyl chloride (PVC) intended for 1.8/3KV and 3.6/6KV cables, cross-linked polyethylene compound (XLPE) or ethylene propylene rubber (EPR/HEPR).
Table 1. Insulation Thickness Of XLPE Or EPR/HEPR Insulation
Nom. CrossSection Area
Insulation Thickness at Nominal Voltage
1.8/3KV (Um=3.6KV)
3.6/6KV
(Um=7.2KV)
6/10KV (Um=12KV)
8.7/15KV (Um=17.5KV)
12/20KV (Um=24KV)
18/30KV (Um=36KV)
21/35KV (Um=42KV)
26/35KV (Um=42KV)
mm2
mm
mm
mm
mm
mm
mm
mm
mm
XLPE/EPR
XLPE
EPR
XLPE/EPR
XLPE/EPR
XLPE/EPR
XLPE/EPR
XLPE/EPR
XLPE/EPR
Unscreened
Screened
10
2.0
2.5
3.0
2.5
-
-
-
-
-
-
16
2.0
2.5
3.0
2.5
3.4
-
-
-
-
-
25
2.0
2.5
3.0
2.5
3.4
4.5
-
-
-
-
35
2.0
2.5
3.0
2.5
3.4
4.5
5.5
-
-
-
50 – 185
2.0
2.5
3.0
2.5
3.4
4.5
5.5
8.0
9.3
10.5
240
2.0
2.6
3.0
2.6
3.4
4.5
5.5
8.0
9.3
10.5
300
2.0
2.8
3.0
2.8
3.4
4.5
5.5
8.0
9.3
10.5
400
2.0
3.0
3.0
3.0
3.4
4.5
5.5
8.0
9.3
10.5
500 - 1600
2.2-2.8
3.2
3.2
3.2
3.4
4.5
5.5
8.0
9.3
10.5
*Insulation Thickness of PVC is 3.4mm (1- 1600mm sq) for 3.6/6KV cables.
Insulaton Screen: The insulation screen consists of an extruded layer of non metallic, semi- conducting compound extruded over the insulation. The extruded semi-conducting layer shall consist of bonded or cold strippable semi-conducting compound capable of removal for jointing or terminating. As an option, a semi-conducting tape may be applied over the extruded semi-conducting layer as a bedding for the metallic layer. The minimum thickness is 0.3 mm and the maximum resistivity is 500 Ohm-m at 90°C. The screen is tightly fitted to the insulation to exclude all air voids and can be easily hand stripped on site. The insulation screen is not necessary for both PVC and EPR/HEPR insulated 1.8/3KV and 3.6/6KV cables. The screen may be covered by semi-conductive water blocking swellable tape to ensure longitudinal watertightness.Metallic Layer: The metallic layer may be applied over the individual cores or the core assembly collectively.The following types of metallic layers are provided:1) Metallic Screen2) Concentric Conductor3) Metallic Sheath4) Metallic armourThe metallic screen shall consist of either copper tapes or a concentric layer of copper wires or a combination of tapes and wires to provide an earth fault current path. The concentric conductor is applied directly either over the insulation, or over the insulation screen or over an inner covering. The metallic sheath consists of lead or lead alloy applied as a tightly fitting seamless tube. The metallic armour consists of either flat wire armour, round wire armour, and double tape armour.
Table 2. Minimum Total Cross Section Of Metallic Screen
Nom. Cross-Section Area of Cable
Min. Cross-Section of Metallic Screen
DC Resistance of the Copper Wire Screen
mm²
mm²
mm
up to 120
16
1.06
150-300
25
0.72
400-630
35
0.51
800-1000
50
0.35
Separation Sheath (for armoured cable): The separation sheath comprises a layer of extruded PVC, PE or LSZH, applied under the armour .The nominal thickness is calculated by 0.02Du + 0.6mm where Du is the fictitious diameter under the sheath in mm. For cables without a lead sheath, the nominal separation sheath thickness shall not be less than 1.2mm. For cables where the separation sheath is applied over the lead sheath, the nominal separation sheath thickness shall not be less than 1.0mm.Lapped Bedding (for armoured lead sheathed cable): The lapped bedding consists of either impregnated/synthetic compounded paper tapes or a combination of two layers of these paper tapes followed by a few layers of compounded fabulous materials. The thickness is around 1.5mm.Armour (for armoured cable): The armour consists of round aluminium wire armour applied helically over an extruded separation sheath.Table 3. Round Armour Wire Diameter
Fictitious Diameter Under the Armour
Armour Wire Diameter
mm
mm
>
<< p=""><
-
10
0.8
10
15
1.25
15
25
1.6
25
35
2.0
35
60
2.5
60
-
3.15
Over Sheath: Overall sheath comprises a layer of extruded thermoplastic compound (PVC, PE or LSZH can be offered as an option.) or elastomeric compound (polychlorprene CSP or chlorosulfonated PE). The nominal oversheath thickness is calculated by 0.035D+1 where D is the fictitiuous diameter immediately under the oversheath in mm. For unarmoured cables and cables with the oversheath not applied over the armour, metallic screen or concentric conductor, the nominal oversheath thickness shall not be less than 1.4mm. And for cables with oversheath applied over the armour, metallic screen or concentric conductor, the nominal oversheath thickness shall not be less than 1.8mm.PHYSICAL PROPERTIES:Operating Temperature: up to 70°C (PVC insulation); up to 90°C (XLPE or EPR insulation)Temperature Range: -5°C ( PVC sheath ); -20°C ( PE sheath )Short Circuit Temperature( 5 seconds maximum duration ): 140-160°C (PVC insulation);250°C (XLPE or EPR insulation)Bending Radius: 12 x ODTable 4. Nominal /Operating /Testing Voltages
Rated Voltage Uo/U
Operating Voltage (Um)
Testing Voltage (rms)
1.8/3KV
3.6KV
6.5KV
3.6/6KV
7.2KV
12.5KV
6/10KV
12KV
21KV
8.7/15KV
17.5KV
30.5KV
12/20KV
24KV
42KV
18/30KV
36KV
63KV
21/35KV
42KV
73.5(53)*KV
26/35KV
42KV
91(65)*KV
*21/35KV and 26/35kV power frequency voltage test can be made under the following conditions: 2.5Uo x 30mins or 3.0Uo x 15mins. Numbers in brackets refer to the test values for 3.0Uo x 1.5mins.Single Core 1.8/3KV (Um=3.6KV) Dimensional Data
Nom. Cross-Section Area
Unarmoured Cables
Steel Wire Armoured Cables
Nom. Insulation Thickness
Copper Tape Thickness
Copper Wire Screen Area*
Nom. Sheath Thickness
Approx. Overall Diameter
Approx. Weight
Nom. Bedding Thickness
Armour Wire Size
Nom. Sheath Thickness
Approx. Overall Diameter
Approx. Weight
CU
AL
CU
AL
mm2
mm
mm
mm2
mm
mm
kg/km
mm
mm
mm
mm
kg/km
10
2.0
0.1
16
1.8
13
240
180
1.2
1.6
1.8
18
460
400
16
2.0
0.1
16
1.8
13
300
200
1.2
1.6
1.8
19
530
430
25
2.0
0.1
16
1.8
15
410
250
1.2
1.6
1.8
20
650
500
35
2.0
0.1
16
1.8
16
510
300
1.2
1.6
1.8
21
780
560
50
2.0
0.1
16
1.8
17
640
350
1.2
1.6
1.8
22
930
640
70
2.0
0.1
16
1.8
19
850
440
1.2
1.6
1.8
24
1170
750
95
2.0
0.1
16
1.8
20
1130
540
1.2
1.6
1.8
26
1460
870
120
2.0
0.1
16
1.8
22
1370
630
1.2
1.6
1.8
27
1730
990
150
2.0
0.1
25
1.8
23
1650
730
1.2
1.6
1.8
29
2030
1110
185
2.0
0.1
25
1.8
25
2010
860
1.2
1.6
1.9
30
2430
1280
240
2.0
0.1
25
1.8
27
2570
1050
1.2
1.6
2.0
33
3040
1530
300
2.0
0.1
25
1.8
29
3160
1250
1.2
2.0
2.1
36
3760
1860
400
2.0
0.1
35
1.9
33
3980
1560
1.2
2.0
2.2
39
4660
2230
500
2.2
0.1
35
2.1
35.5
4910
1905
1.3
2.5
2.5
43
5930
2930
630
2.4
0.1
35
2.2
39.7
6340
2420
1.4
2.5
2.6
49
7370
3430
800
2.6
0.1
50
2.3
44.5
7890
2980
1.4
2.5
2.7
52
9070
4230
1000
2.8
0.1
50
2.5
49.4
9890
3700
1.5
2.5
2.9
56
11100
4950
*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as standard.Electrical Data
Nom. Cross-Section Area
D C Resistance CU / AL
A C Resistance CU / AL
Short Circuit Rating of Conductor CU / AL1 sec
Capaci-tance
Charging Current
Short Circuit Rating of Copper Wire Screen1 sec
Short Circuit Rating of Copper Tape Screen1 sec
Reactance
Inductance
Impedance
Trefoil
Flat Spaced
Trefoil
Flat Spaced
Trefoil
Flat Spaced
cu
AL
cu
AL
mm2
μΩ/m
μΩm
kA
pF/m
mA/m
kA
kA
μΩ/m
nH/m
μΩ/ m
μΩ/ m
10
1830/3080
2330/3920
1.4/0.9
182
0.27
2.6
0.2
151
201
384
558
2332
3846
2332
3840
16
1150/1910
1460/2420
2.2/1.4
201
0.29
2.6
0.3
140
193
362
546
1462
2411
1478
2420
25
727/1200
927/1538
3.6/2.3
222
0.32
2.6
0.3
131
185
345
535
936
1544
952
1554
35
524/868
668/1113
5.0/3.2
251
0.35
2.6
0.4
122
178
327
524
679
1121
695
1131
50
387/641
494/822
6.8/4.4
281
0.39
2.6
0.4
116
172
313
514
511
834
527
844
70
268/443
343/568
9.8/6.3
341
0.45
2.6
0.5
110
165
300
495
364
583
386
597
95
193/320
248/410
13.3/8.5
397
0.50
2.6
0.5
104
160
287
485
272
427
300
446
120
153/253
196/325
17.2/11.0
430
0.55
2.6
0.6
104
159
283
480
225
345
257
367
150
124/206
159/266
21.2/13.5
464
0.59
4.3
0.6
100
156
280
475
193
287
229
313
185
99.1/164
128/211
26.6/17.0
513
0.65
4.3
0.7
98
154
274
465
165
237
206
267
240
75.4/125
98/161
34.9/22.3
573
0.70
4.3
0.9
94
150
267
459
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