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Covered Conductors Type CC Type CCT(AS/NZS 3675)

Covered Conductors Type CC Type CCT(AS/NZS 3675)

Covered Aerial Cables Application AS/NZS 3675 standard covered conductor is covered with insulation material but without conductor or insulation screens. They m
Covered Aerial Cables Application
AS/NZS 3675 standard covered conductor is covered with insulation material but without conductor or insulation screens. They must be used in a similar manner to open wire 11 to 33kV
bare overhead systems.
Covered Aerial Cables Classification
There are two main types of covered conductors as follow: CC and CCT. We can provide perfect recommendations on the most suitable installation conditions and fittings for both systems.
Covered Conductor CC
CC covered conductors have a covering with a minimum average thickness of 2.0mm for use on all working voltages up to and including 19/33kV. CC can withstand intermittent contact with conductive material between phases or to ground. e.g. trees and branches, but should not remain in permanent contact.
1. Conductors:
conductors are available in aluminium, aluminium alloy and aluminium clad steel.
2.Water blocking:
water blocked with a special material meeting all the test requirements of AS/NZS 3675.
3.Covering:
conductors are covered with a track resistant UV stabilised XLPE.
4.Marking:
CC are marked on the external surface with“CC”, logo, year of manufacture, and conductor material. They are also marked with sequential six-digit numbers at 1-metre intervals, with the
lowest number at the inner end of the drum.
Covered Conductor CCT (FULL THICKNESS COVERING)
CCT covered conductors have a specified thickness of covering for each of the nominated working voltages. While still required to operate under similar principles to a bare wire or CC system, they have electrical and mechanical characteristics which permit them to remain in contact with tree limbs for an extended period dependent on abrasive characteristics of the tree, frequency and strength of prevailing winds and operating temperature.
CCT show better performance in polluted environments. They are suitable for use in spacer cable systems and in the Insulated Unscreened
Conductor (IUC) systems.
1.Conductors:
conductors are available in aluminium, aluminium alloy and aluminium clad steel.
2. Water blocking:
water blocked with a special material meeting the test requirements of AS/NZS 3675.
3.Covering:
conductors are covered with a track resistant UV stabilised XLPE or with an inner layer of non-UV stabilised XLPE.and an outer layer of UV stabilised High Density Polyethylene (HDPE). In the latter case, the average thickness of HDPE is not more than 40% of the specified minimum average thickness, and not less than 1.0mm.
4.Marking:
CCT are marked on the external surface with “CCT", logo, year of manufacture, and conductor material. They are also marked with sequential six-digit numbers at 1-metre intervals, with the lowest number at the inner end of the drum.
Specafications
AS/NZS 3675 Standard Covered Conductor
Conductor size No./mm Conductor d.c. resistance at 20°C Conductor a.c. resistance at 80°C Reactance at 50 Hz (460 mm spacing) Continuous current carrying capacity Fault current rating kA for 1 sec.* Everday working tensionf kN Maximum working tension (50% MBL) kN Minimum breaking load kN Minimum bending radius mm
Based on 30°C ambient Based on 40°C ambient
Ω/km Ω/km Ω/km Still air 1.0 m/s wind 2.0 m/s wind      
Alloy 6201
7/2.75 0.799 0.988 0.331 125 210 235 110 185 210 3.5 1.51 5.8 11.6 200
7/3.75 0.43 0.532 0.312 180 300 345 160 270 310 6.4 2.82 10.9 21.7 245
7/4.75 0.268 0.331 0.297 245 410 465 220 365 415 10.3 4.52 17.4 34.8 290
19/3.50 0.183 0.227 0.281 315 515 595 280 460 530 15.2 6.67 25.7 51.3 340
Alloy 1120
7/2.75 0.713 0.881 0.331 130 220 250 115 195 225 3.7 1.49 4.96 9.91 200
7/3.75 0.383 0.474 0.312 190 320 365 170 285 325 6.8 2.64 8.8 17.6 245
7/4.75 0.239 0.296 0.297 260 430 485 230 385 435 11 4.07 13.6 27.1 290
19/3.50 0.163 0.202 0.281 330 545 625 295 485 560 16.2 6.26 20.9 41.7 340
TECHNICAL PERFORMANCE CHARACTERISTICS FOR COVERED CONDUCTORS (CCT)
Conductor size No./mm Conductor d.c. resistance at 20°C Conductor a.c. resistance at 80°C Reactance at 50 Hz (460 mm spacing) Continuous current carrying capacity Fault current rating kA for 1 sec.* Everday working tensionf kN Maximum working tension (50% MBL) kN Minimum breaking load kN Minimum bending radius mm
Based on 30°C ambient Based on 40°C ambient
Ω/km Ω/km Ω/km Still air 1.0 m/s wind 2.0 m/s wind      
11 kv covered conductor Alloy 6201
7/3.75 0.43 0.532 0.312 185 295 330 165 265 295 6.4 2.82 10.9 21.7 285
7/4.75 0.268 0.331 0.297 245 390 440 220 350 395 10.3 4.52 17.4 34.8 330
19/3.50 0.183 0.227 0.281 315 500 560 280 445 500 15.2 6.67 25.7 51.3 380
22 kV covered conductor Alloy 6201
7/3.75 0.43 0.532 0.312 185 285 315 165 255 280 6.4 2.82 10.9 21.7 350
7/4.75 0.268 0.331 0.297 245 375 420 220 335 375 10.3 4.52 17.4 34.8 395
19/3.50 0.183 0.227 0.281 315 475 530 280 425 475 15.2 6.67 25.7 51.3 445
33kv covered conductor Alloy 6201
7/3.75 0.43 0.532 0.312 185 270 295 165 240 265 6.4 2.82 10.9 21.7 425
7/4.75 0.268 0.331 0.297 245 360 400 220 320 355 10.3 4.52 17.4 34.8 470
19/3.50 0.183 0.227 0.281 315 455 505 280 405 450 15.2 6.67 25.7 51.3 520
XLPE covered aerial cables Alloy 1120 conductors
Conductor size No./mm Conductor d.c. resistance at 20°C Conductor a.c. resistance at 80°C Reactance at 50 Hz (460 mm spacing) Continuous current carrying capacity Fault current rating kA for 1 sec.* Everday working tensionf kN Maximum working tension (50% MBL) kN Minimum breaking load kN Minimum bending radius mm
Based on 30°C ambient Based on 40°C ambient
Ω/km Ω/km Ω/km Still air 1.0 m/s wind 2.0 m/s wind      
11kv covered conductor Alloy 1120
7/2.75 0.713 0.881 0.331 130 215 240 115 190 215 3.7 1.49 4.96 9.9 230
7/3.75 0.383 0.474 0.312 190 315 345 170 280 310 6.8 2.64 8.8 17.6 285
7/4.75 0.239 0.296 0.297 26() 415 470 230 370 420 11 4.07 13.6 27.1 330
19/3.50 0.163 0.202 0.281 330 525 595 295 470 530 16.2 6.26 20.9 41.7 380
22 kV covered conductor Alloy 1120
7/2.75 0.713 0.881 0.331 135 205 225 120 185 200 3.7 1.49 4.96 9.9 300
7/3.75 0.383 0.474 0.312 190 295 330 170 265 295 6.8 2.64 8.8 17.6 350
7/4.75 0.239 0.296 0.297 260 400 440 230 355 395 11 4.07 13.6 27.1 395
19/3.50 0.163 0.202 0.281 330 505 560 295 450 500 16.2 6.26 20.9 41.7 445
33kv covered conductor Alloy 1120
7/2.75 0.713 0.881 0.331 135 195 215 120 175 190 3.7 1.49 4.96 9.9 385
7/3.75 0.383 0.474 0.312 195 285 315 175 255 280 6.8 2.64 8.8 17.6 425
7/4.75 0.239 0.296 0.297 260 380 420 230 340 375 11 4.07 13.6 27.1 470
19/3.50 0.163 0.202 0.281 330 480 530 295 430 475 16.2 6.26 20.9 41.7 520
* Initial temperature 80°C, final temperature 210°C, constant K = 83.0 for alloy 6201 and 88.4 for alloy 1120. f 13% MBL fbr alloy 6201 and 15% MBL for alloy 1120.

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