Type Cc Type CCT Covered Conductors (ASNZS 3675)

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Type CC Type CCT Covered Conductors (ASNZS 3675)

Type CC & CCT covered conductors built to AS/NZS 3675 standards.

Reliable overhead solution with tough weather-resistant covering.

Designed for safe, compact, and low-maintenance distribution lines.

Hard-drawn aluminum conductors with UV-stabilized insulation.

Ideal for bushfire-prone and high-clearance areas in ANZ networks.

Application

Type CC and Type CCT Covered Conductors are overhead low-voltage cables manufactured in compliance with AS/NZS 3675, specifically developed for Australian and New Zealand distribution networks in bushfire-prone and high-risk environments.

These conductors consist of a hard-drawn aluminum or aluminum alloy conductor covered with dual-layer or triple-layer UV-resistant thermoplastic insulation.

Type CC features a two-layer covering, offering basic insulation and resistance to accidental contact, trees, and environmental exposure.
Type CCT includes a third carbon-blackened UV protection layer, enhancing durability in extreme solar radiation and long-term outdoor installations.

Both types maintain electrical continuity with ground, enabling effective system protection and fault detection—unlike fully insulated systems. They provide a safer alternative to bare conductors while preserving the simplicity of open-wire installation.

Type CC and CCT conductors are ideal for use in rural networks, agricultural areas, roadside lines, and regions requiring enhanced fire mitigation, especially under Australia’s bushfire compliance guidelines. They are compatible with standard pole hardware and deliver low maintenance, long service life, and improved public safety.

Specifications

Category	Technical Description	Typical Applications
Standard	AS/NZS 3675 – Specifies covered overhead conductors for use in LV/MV distribution networks	Widely used in Australia and New Zealand, especially in bushfire-prone and vegetated rural areas
Conductor Types	– Type CC: Circular Stranded Aluminum 1350-H19– Type CCT: Thermal-Resistant Aluminum Alloy (TRAA) conductor (better sag & thermal profile)	Type CCT preferred for high-temperature operation and better mechanical performance
Covering Material	– Thick-wall UV-resistant cross-linked polyethylene (XLPE) or high-density polyethylene (HDPE)	Provides mechanical protection and partial insulation; not rated for full dielectric withstand
Voltage Class	– Generally used up to 22 kV (MV)- Typical: 6.35/11 kV, 12.7/22 kV	Suitable for overhead rural feeders, spur lines, fire-risk zones
Insulation Status	– Covered, not insulated – conductor is touch-protected but air clearance requirements remain	Installed on insulators, unlike ABC cables
Color / Marking	Usually black outer layer with indented markings for phase ID and traceability	Ensures easy identification during installation and maintenance

Attribute	Type CC	Type CCT
Conductor Material	1350-H19 aluminum	Thermal-resistant aluminum alloy (e.g., 1120, 6201)
Operating Temperature	Typically 90°C	Up to 110°C continuous, 130°C overload
Sag Resistance	Moderate (standard aluminum sag)	Improved – better tension handling in long spans
Current Carrying	Standard ampacity	Slightly higher due to improved thermal rating
Mechanical Strength	Good	Better – suited for longer pole spacing and wind zones
Application Preference	General overhead installations	Bushfire zones, hot climates, difficult terrain, retrofit upgrades

Parameter

AS/NZS 3675 Type CC & Type CCT 11kv 22kv 33kv Covered Conductor 🇦🇺 Australia, 🇳🇿 New Zealand, Fiji, Papua New Guinea, Solomon Islands, Tonga, Samoa and other South Pacific island countries

Type CC & Type CCT 11kv 22kv 33kv 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
	Conductor d.c. resistance at 20°C	Conductor a.c. resistance at 80°C	Reactance at 50 Hz (460 mm spacing)	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
	Conductor d.c. resistance at 20°C	Conductor a.c. resistance at 80°C	Reactance at 50 Hz (460 mm spacing)	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
	Conductor d.c. resistance at 20°C	Conductor a.c. resistance at 80°C	Reactance at 50 Hz (460 mm spacing)	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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