250 kcmil

Description

Description

Standards

  • Product
    ASTM B 496; ASTM B 8; ICEA S-93-639; UL 1072

Application

Medium Voltage single core cables are used in electrical energy distribution networks, as feeders for transformers in substations, industrial facilities and urbanizations. They are suitable for installations in dry or wet locations, outdoors and in underground ducts.

Construction

​1. Conductor: Plain annealed Copper, compact class B stranding.

2. Conductor screen: Extruded semiconductive compound.

3. Insulation: Cross-linked Polyethylene (XLPE).

4. Insulation screen: Strippable semiconductive compund.

These last three components extruded in CV (continuous vulcanization) of triple extrusion in the dry curing process.

5. Screen: Made up of copper tape.

6. Outer jacket: PVC compound, flame retardant, resistant to heat, abrasion and humidity, resistant to sunlight (SR), black color. 

Applicable Standards

ICEA S-93-639, NTC 2186-2, NEMA WC 74.

Certificate

RETIE  N° 00412

Operating Temperature

90 °C.

Operating Voltage

15 kV.

Identification

Insulation in natural color and black external jacket. Sequential length meter by meter with return to zero.

Unit Packaging

500 m or 1000 m reels. Other packaging units available upon request.

Optional Features available upon request:

Insulation in XLPE-TR (Tree retardant) compound. External covering in HDPE, LDPE or XLPE. Application of additives for protection against rodents and termites. Water blocking system in conductor and/or screen, longitudinal and/or radial.

For more information, contact our sales representative.

Ampacity and Reactance Conditions

  • Ampacities of Insulated Single Copper Conductor Isolated in Air Based on Conductor Temperatures of 90°C and Ambient Air Temperature of 40°C. According to NEC, Table 310.60(C)(69).
  • Ampacities of Three Single-Insulated Copper Conductors in Underground Electrical Ducts (Three Conductors per Electrical Duct) Based on Ambient Earth Temperature of 20°C, 100% Load Factor, Thermal Resistance (RHO) of 90, Conductor Temperatures of 90°C. According to NEC, Table 310.60(C)(77).
  • Reactance Inductive to 90°C, 60Hz, 3 conductors spaced 1 diameter. Trifoil and flat configuration.

NOTE:

  • The data reported here are nominal and are subject to tolerances according to standards and normal manufacturing practices.
  • Other configurations not specified in this catalog may be available under special request and minimum manufacturing quantitie.

RECOMMENDATIONS FOR THE SELECTION OF ACCESSORIES AND DUCTS

The technical information presented here is for reference purposes only. Actual dimensions and construction details will only be available with the test reports for each manufacturing order. For the selection of accessories and/or ducts, it is recommended to measure directly on the actual dimensions of the cable using the appropriate methods and instruments. Centelsa by Nexans will not assume any responsibility for the selection of such elements.

Characteristics

Characteristics

Construction characteristics

Construction characteristics

Conductor material
Soft copper
Conductor shape
Circular compacted
Conductor flexibility
Class B
Insulation
XLPE (Cross-linked Polyethylene)
Screen
Copper tape
Jacket material
PVC

Dimensional characteristics

Dimensional characteristics

Conductor cross-section (AWG/KCMIL)
250 KCMIL
Total number of wires
37
Conductor cross-section
127 mm²
Conductor diameter
13.25 mm
Minimum insulation thickness
5.33 mm
Nominal outer diameter
31.16 mm
Approximate weight
1870.47 kg/km
Minimum outer sheath thickness
1.78 mm

Electrical characteristics

Electrical characteristics

Insulation Level
133 %
Maximum rated voltage
15 kV
Dielectric strength core to screen AC
44.0 kV
Time of application Dielectric strength core to screen AC
5 min.
Maximal partial discharge test
5 pC
Max. DC resistance of the conductor at 20°C
0.142 Ohm/km
Max. Electrical Resistance AC 60Hz 90°C
0.181 Ohm/km
Nominal capacitance
225.0 pF/m
Perm current rating in air 40°C
445 A
Permissible current rating buried/duct 20°C - Trefoil formation
325 A
Phase reactance 60 Hz - flat formation
0.154 Ohm/km
Phase reactance 60 Hz - trefoil formation
0.137 Ohm/km

Mechanical characteristics

Mechanical characteristics

Maximum Pull Tension of Conductor
9 kN
Minimum repeated bending diameter
374 mm

Usage characteristics

Usage characteristics

Flame retardant
IEC 60332-1-2
Maximum operating temperature
90 °C
Overload maximum core temperature
130 °C
Short-circuit max. conductor temperature
250 °C
U.V resistance
UL 2556 - Sunlight Resistance
Oil resistance
ICEA S-93-639 (70°C/4h)

Resources

Resources

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