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Covered Cable

OVERHEAD INSULATED CABLE

Covered Cable ABNT NBR 11873

Covered Cable of the ABNT NBR 11873 type is a phase conductor for compact overhead distribution lines on spacers: compacted round aluminium with an extruded XLPE covering (15 kV and 25 kV classes) or XLPE/HDPE covering (35 kV class). The TDS lists 25 constructions from 35 mm² to 300 mm². TDS values are catalogue data.

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ABNT NBR 11873 is the Brazilian standard for covered cables with a polymeric covering that resists electrical tracking and weathering, used as phase conductors of overhead distribution networks at voltages up to 34.5 kV. It sets the requirements for qualifying and accepting these cables in the 15 kV, 25 kV and 35 kV voltage classes. The cables have no insulation screen, so they are covered cables, not insulated cables.

The extruded covering reduces the leakage current if the line touches an earthed object by accident, and it lets the conductors be spaced closer together. Cables with compacted round aluminium conductors, as on this page, are intended for compact networks on spacers. Occasional contact with trees is allowed in service, but not permanent contact. The standard does not allow installation in heavily polluted or highly saline areas.

Construction

  • Conductor: Aluminium, class 2 stranding, circular compacted
  • Conductor screen: Extruded semi-conducting layer: none on the 15 kV class constructions in the TDS; fitted on the 25 kV and 35 kV classes. The standard leaves it to the purchaser at 15 kV and 25 kV and requires it at 35 kV
  • Covering: Extruded XLPE (15 kV and 25 kV classes) or XLPE/HDPE (35 kV class), weather and UV resistant

Type Designation

The standard designates each cable by conductor type, nominal cross section in mm², blocked or unblocked conductor, voltage class of the covering (15, 25 or 35 kV) and covering material (LDPE/HDPE, XLPE/HDPE or XLPE).

Conductor Temperature Limits

Covering Material Normal Service Overload Short Circuit (max. 5 s)
XLPE or XLPE/HDPE 90 °C 100 °C 250 °C
LDPE/HDPE 70 °C 90 °C 160 °C

Overload operation is limited to 100 h in any 12 consecutive months and 500 h in total over the service life of the cable. The cables on this page have XLPE-based coverings.

Typical Applications

  • Compact overhead distribution lines up to 34.5 kV, with the covered phases held in spacers
  • Routes near trees, where contact with branches can occur from time to time

Covered Cable of the ABNT NBR 11873 type is a covered aluminium phase conductor for compact overhead lines. The main data are summed up below; every construction is listed in the TDS tab.

Technical Characteristics

Applicable Standard ABNT NBR 11873
Standard Scope Tracking- and weather-resistant polymeric covered cables for overhead distribution up to 34.5 kV (covered, not insulated)
Voltage Class 15 kV, 25 kV and 35 kV
Conductor Class 2 compacted round aluminium, 35 mm² to 300 mm²
Covering XLPE (15 kV, 25 kV); XLPE/HDPE (35 kV)
Nominal Covering Thickness 3.0 mm (15 kV), 4.0 mm (25 kV), 7.6 mm (35 kV)
Conductor Screen None (15 kV); 0.5 mm approx. (25 kV); 0.6 mm approx. (35 kV)
Approx. Cable Diameter 13.0 mm to 37.2 mm
Max. Conductor Temperature 90 °C normal, 100 °C overload, 250 °C short circuit

Ordering Information

Please state the voltage class, the cross section, whether a blocked conductor is wanted, the total length and the length per reel.

15 kV Class, Aluminium Conductor, XLPE Covering

Nominal Cross Section Min. Number of Wires Max. DC Resistance at 20 °C Approx. Conductor Screen Thickness Nominal Covering Thickness Approx. Cable Diameter Min. Breaking Load Approx. Weight
mm² No. Ω/km mm mm mm daN kg/km
35 6 0.868 – 3.0 13.0 455 185
50 6 0.641 – 3.0 14.1 650 227
70 12 0.443 – 3.0 15.8 910 298
95 15 0.320 – 3.0 17.6 1235 384
120 15 0.253 – 3.0 18.8 1560 459
150 15 0.206 – 3.0 20.5 1950 546
185 30 0.164 – 3.0 22.1 2405 658
240 30 0.125 – 3.0 24.4 3120 834
300 30 0.100 – 3.0 26.5 3900 1018

25 kV Class, Aluminium Conductor, XLPE Covering

Nominal Cross Section Min. Number of Wires Max. DC Resistance at 20 °C Approx. Conductor Screen Thickness Nominal Covering Thickness Approx. Cable Diameter Min. Breaking Load Approx. Weight
mm² No. Ω/km mm mm mm daN kg/km
35 6 0.868 0.5 4.0 16.2 455 260
50 6 0.641 0.5 4.0 17.3 650 309
70 12 0.443 0.5 4.0 19.0 910 389
95 15 0.320 0.5 4.0 20.8 1235 485
120 15 0.253 0.5 4.0 22.0 1560 566
150 15 0.206 0.5 4.0 23.7 1950 662
185 30 0.164 0.5 4.0 25.3 2405 783
240 30 0.125 0.5 4.0 27.6 3120 972
300 30 0.100 0.5 4.0 29.7 3900 1167

35 kV Class, Aluminium Conductor, XLPE/HDPE Covering

Nominal Cross Section Min. Number of Wires Max. DC Resistance at 20 °C Approx. Conductor Screen Thickness Nominal Covering Thickness Approx. Cable Diameter Min. Breaking Load Approx. Weight
mm² No. Ω/km mm mm mm daN kg/km
70 12 0.443 0.6 7.6 26.5 910 653
95 15 0.320 0.6 7.6 28.3 1235 770
120 15 0.253 0.6 7.6 29.5 1560 865
150 15 0.206 0.6 7.6 31.2 1950 981
185 30 0.164 0.6 7.6 32.8 2405 1120
240 30 0.125 0.6 7.6 35.1 3120 1335
300 30 0.100 0.6 7.6 37.2 3900 1555

Values in this TDS are catalogue data. Dimensions and masses are approximate; resistance values are maxima at 20 °C.

Requirements Set by the Standard

  • Qualification and acceptance requirements apply to the covered cable.
  • If the conductor is blocked, the blocking material fills the gaps between the wires, is coloured so it can be told apart from the conductor, and passes the blocking test.
  • The conductor screen, where fitted, is an extruded semi-conducting polymer matched to the covering; it sits tightly on the conductor and can be removed cold.
  • For compacted aluminium conductors the outer layer is stranded right-hand.

Product Inquiry

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Please send your required cable designation, number of conductors, nominal cross-section, support cable type, rated voltage, packing length, and project standard.

Selected Product: Covered Cable ABNT NBR 11873