XT 35 mm² 12/20 (24) kV

Description

Description

Standards

  • International
    IEC 60228; IEC 60332-1-2; IEC 60502-2
  • National
    ASTM B 3; ASTM B 496; ASTM B 8; ICEA S-93-639; UL 1072

Applications

Power shielded cable for fixed installations, used for connection of transformers, switchgears, GIS substations, motors, generators, feeders in distribution networks. Suitable to be installed directly buried, buried in ducts, in conduits or in free air.

Construction: Singlecore cable.

Conductor: Compact-round stranded copper conductor. For AWG and kcmil sizes: class B according to ASTM B-3, ASTM B8 and ASTM B-496 according to requirements of ICEA S-93-639. For standard mm² sizes: class 2 according to IEC 60228.

Conductor shield: Extruded semiconducting material.

Insulation: Tree-Retardant crosslinked polyethilene (TR-XLPE)  or crosslinked polyethylene (XLPE) with excellent electrical properties, good resistance to ozone and chemical agents.

Insulation shield: Extruded semiconducting material.

Metallic shield: Copper tape applied helically in intimate contact with the underlaying semiconducting layer. 12% mimimum overlap.

Oversheath: Polyvinyl Chloride (PVC), flame retardant, resistant to weather and UV radiation. Color upon request.

 

Marking: NEXANS CHILE XT "size" "Rated voltage" "Nominal Insulation Thickness" (1) Cu XLPE 90°C "Manuf. order" "Date"

(1) Nominal insulation Thickness information on marking only applies for cables according to ICEA S-93-639

 

Design Alternatives

XT-RAT: Resistant to rodent attack.

 

HFFR alternative:

FREETOX Medium Voltage 

 

INSTALLATION CONDITIONS FOR CURRENT CARRYING CAPACITIES_MV CABLES

(1) Current carrying capacities based on ICEA P-46-426, for installations were ducts and cables are not directly exposed to solar radiation.

De-rating factors must be applied according to specific installation conditions.

INSTALLATION CONDITIONS FOR CURRENT CARRYING CAPACITIES_MV CABLES

Characteristics

Characteristics

Construction characteristics

Construction characteristics

Conductor material
Copper
Conductor shape
Circular
Conductor flexibility
Class 2
Outer sheath
PVC
Insulation
TR-XLPE (Tree-Retardant Cross-linked Polyethylene)

Dimensional characteristics

Dimensional characteristics

Conductor cross-section (AWG/KCMIL)
-
Conductor cross-section
- kcmil
Conductor cross-section
35 mm²
Phase Conductor Cross Section
35 mm²
Total number of wires
7
Phase Conductor Diameter
7 mm
Nominal insulation thickness
5.5 mm
Minimum insulation thickness
4.9 mm
Diameter over insulation
19.0 mm
Screen section
4.7 mm²
Minimum outer sheath thickness
1.16 mm
Outer Diameter
24 mm
Nominal outer diameter
24.0 mm
Approximate weight
760 kg/km
Number of cores
1

Electrical characteristics

Electrical characteristics

Operating voltage
20 kV
Insulation Level
- %
Maximum operating voltage
24 kV
Max. DC resistance of the conductor at 20°C
0.524 Ohm/km
A.C. Conductor resist. 50Hz and at 90 °C
0.668 Ohm/km
Inductive reactance at 50Hz and 90°C flat spaced
0.195 Ohm/km
Perm current rating in air 40°C
200 A
Permissible current rating buried 20°C
215 A
Perm. Current in duct 20°C
183 A
Voltage Drop
1.13 V/A.km
Permissible short circuit current
15.7 kA

Mechanical characteristics

Mechanical characteristics

Maximum pulling tension with pulling eyes
245 kgf
Maximum pulling tension with pulling grips
58 kgf

Usage characteristics

Usage characteristics

Laying operation bending radius
336 mm
Minimum Bend Radius - Installed
288 mm
Max. conductor temperature in service
90 °C
Overload maximum core temperature
130 °C
Short-circuit max. conductor temperature
250 °C
Minimum installation temperature
-10 °C
Flame retardant
IEC 60332-1-2
Oil resistance
ICEA S-93-639 (70°C/4h)
U.V resistance
UL 1581

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Resources

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