In a Covered Aerial MV (Spacer Cable), spacers hold three MV phase conductors in close approximation.Spacers are suspended from a high-strength messenger wire. Covered Aerial cable itself is a single aluminum conductor protected by a layer of track-resistant polyethylene.

Application: Overhead single core cables with aluminum conductor and three layer of insulation, for overhead power transmission and distribution lines up to 33 Kv.

ENGINEERING  SPECIFICATIONS

STANDARD   according to Hendrix specification.
Rated Voltage  12/20kv or 18/30 kv.
Conductor  stranded with compress concentric 1350-H19 wires .
Core  the conductor is insulated with a three  layer of extruded compound.
Operating temperature  90°c continues normal operation.
Features and Benefits The covering provides mechanical protection to the Conductor and it is resistant to weathering and chemicals. If the conductors accidentally come into contact due to high winds, falling tree limbs or other disturbances, the covering resists short circuits and the tendency for conductors to weld together.
Spacer cables characteristics and advantage Spacer cables provide a simple, reliable and cost-effective alternative And  also add value to the network, requiring very little maintenance during its entire Lifespan .
Under grounding conductors in these areas can be impractical and have significant economic implications.
Spacer cables are installed in areas where the need for an insulated overhead distribution network is desirable. These areas include, but  not limited to Hilly and mountainous areas.
Network reliability is vulnerable in these areas because of conductor clashing caused during high winds and storms and falling trees and branches
These areas are also more prone to lightning strikes
River Crossings.
Bushfire Danger Areas In the unlikely event that conductors clash, for whatever reason .

Advantages of spacer cables and comparing with medium voltage Aerial Bundled cables:
1 – Troubleshooting Aerial Bundled cables is difficult due to complexity and so is to repair whereas in spacer-cable network this issue has been addressed and solved
2 – The cost of constructing an aerial spacer cable network equals %60 of the network with Aerial Bundled cables
3 – Spacer cable distribution networks are simple and do not require special fittings, equipment or instructions in comparison with Aerial Bundled cables networks
4 – Acquiring splitting and attaching a transformer in medium voltage Aerial Bundled cables networks is extremely difficult whereas in spacer cable networks this issue has been alleviated and improved
5 – Spacer cables are lighter than Aerial Bundled cables and so they require less pole stability power
The advantages of spacer cables with Medium voltage  overhead covered conductors:
1 – All aluminum conductors can be utilized
2 – Extra lightning protection equipment are not needed
3 – Insulators are not needed
4 – Adjacency band limitations are decreased
5 – Multiple feeders can be fitted on one pole
6 – Can be passed through large spans

Space Aerial Cable STRUCTURE:

 

NUMBER OF CORE	Single core
1. CONDUCTOR	Compact stranded hard drawn Aluminum wire Conductor sizes 35 mm2 up to 240 mm2
2. CONDUCTOR SHIELD	Semi conducting cross-linked polyethylene
3. INSULATION	Cross-linked polyethylene Colour : Natural
4. SHEATH	Track resistant cross-linked polyethylene Colour : Black
CLASSIFICATION	Normal operation 90 °C Emergency overload conditions 130 °C Short circuit conditions 250°C Voltage rating 25 Kv.( Phase to Phase )

 

Space Aerial Cable Specifications:

Nominal Sectional Area	Minimum Number of wire	Diameter of Conductor (approx.)	Thickness of Insulation	Thickness of sheath	Overall Diameter (approx.)	Maximum DC. conductor resistance at 20°C	Allowable ampacities in free air at 40°C ambient	Cable weight (approx.)	Standard packing
mm2	NO	mm	mm	mm	mm	Ω / km	A	kg/km	m
25	7	5.9	4.45	3.18	20.0	1.200	119	380	1000/D
35	7	6.95	4.45	3.18	21.0	0.868	149	490	1000/D
50	7	8.33	4.45	3.18	22.0	0.641	186	530	1000/D
70	18	9.73	4.45	3.18	24.5	0.443	229	630	1000/D
95	18	11.45	4.45	3.18	26.0	0.320	279	750	1000/D
120	18	12.95	4.45	3.18	27.0	0.253	321	850	1000/D
150	18	14.27	4.45	3.18	29.5	0.206	371	960	1000/D
185	34	15.98	4.45	3.18	31.0	0.164	429	1100	1000/D
240	34	18.47	4.45	3.18	33.5	0.125	520	1400	1000/D

 

Technical Specification According To Hendrix

Aerial Spacer Cable 20 kv
Crossectional	Conductor Construction	Conductor Dia.	Thickness			Approx. Overal dia	Electical Rwesistance	Calc. Breaking Force	Air Flow Capacity at 200 c	Approx. Conductor Weight
			Semi Conductor	Insulation	Jacket
Mm2	Nxmm	mm	mm	mm	mm	mm	Ω/km	N	A	Kg/km
70	12×2.77	10	0.4	3.2	3.2	23.5	0.443	10.420	229	509
120	15×3.30	13.2	0.4	3.2	3.2	26.7	0.253	18.518	321	729
150	15×3.66	14.8	0.4	3.2	3.2	28.4	0.206	22.457	371	826
185	30×2.88	16.2	0.4	3.2	3.2	29.7	0.164	28.974	429	959
Aerial Spacer Cable 33 kv
70	12×2.77	10	0.4	4.5	3.2	26.0	0.443	10.420	227	630
120	15×3.30	13.2	0.4	4.5	3.2	29.3	0.253	18.518	318	850
150	15×3.66	14.8	0.4	4.5	3.2	30.8	0.206	22.457	367	960
185	30×2.88	16.2	0.4	4.5	3.2	32.2	0.164	28.974	425	1100