Concentric Aluminum Cables Application
This specification is for PVC insulated single phase concentric cables with circular stranded Aluminum conductors for operation up to and including 1000 Volts between phases and 600 Volts to earth.The cable shall have a central phase conductor insulated with red PVC and concentric layer comprising bare aluminum wires (combined neutral-earth conductor) and out sheath in black PVC.
The concentric cables are used as electric service entrance from the power distribution network until the meter panel (especially where it is required to prevent "black" losses or electric power robbery), and as feeder cable from the meters panel until the panel or general distribution panel, just as it is specified in the National Electrical Code. This type of conductor can be used in dry and wet places, directly buried or outdoors; its maximum temperature of operation is 70ºC and its voltage of service for all the applications is 600V.
Concentric Aluminum Cables Strandard
The cable shall be designed and manufactured in accordance with IEC 60502-1 and Kenya Standard KS 04-1022.
Phase Conductor
The phase conductor shall be circular stranded annealed Aluminum conductors (class 2) as specified in KS 04-1022. The phase conductor shall have a left-hand direction of lay.
Insulation
The insulation of the phase conductor shall be red PVC compound specified in KS 04-1022. It shall be applied by an extrusion process and shall be spark tested in accordance with KS 04-1022.The thickness of insulation, determined in accordance with KS 04-1022, shall be not less than the value given in Table 2 of this specification and the smallest of the measured values shall not fall below the value given in the said table by more than (10% + 0.1mm).
Concentric Layer
The neutral conductor shall be concentric and shall be manufactured from plain annealed aluminum wires in accordance with KS 04-1022. The number of wires and the resistance of the neutral conductor shall comply with Table 2 of this specification.The concentric layer shall be applied with a right hand direction of lay.
Oversheath
The oversheath shall be an extruded layer of black PVC compound as specified in KS 04-1022. The oversheath shall be spark tested in accordance with KS 04-1022.
Concentric Aluminum Cables Parameter
| Table 2: Characteristics (as per KS 04-1022) |
|
|
Insulation
Thickness |
Concentric
Neutral Conductor |
Minimum
Lay Length |
Oversheath
Thickness |
Approx.
Overall
Diameter |
Maximum Conductor DC Resistance
Per 1000m of Cable at 20°C |
Nominal Area
mm² |
No. /Dia. mm |
mm |
No. /Dia. mm |
mm |
mm |
mm |
Phase ohms |
Neutral ohms |
| 10 |
7/1.35 |
1.55 |
23/1.13 |
146.5 |
1.4 |
12.21 |
3.08 |
1.335 |
| 16 |
7/1.70 |
1.55 |
26/1.13 |
155 |
1.4 |
13.34 |
1.91 |
1.808 |
| 25 |
7/2.14 |
1.60 |
29/1.13 |
165 |
1.5 |
14.88 |
1.20 |
1.0586 |
| 35 |
19/1.53 |
1.65 |
27/1.35 |
178 |
1.6 |
16.75 |
0.868 |
0.7966 |
