National Motorway Communications System Specifications(TR Series)

TR2031- Loop Detector Feeder Cable

Application and Description

TR2031 loop detector feeder cable is a copper communications cable sheathed with medium density polyethyylene (MDPE) designed for installation in a ducted network. Armoured feeder cables are used to feed electrical current to inductive cable loops and designed for direct burial underground.

Standard

BS 6500

Cable Construction

Non Armored TR2031 TRAFFIC CONTROL CABLE

- Conductor: Solid plain annealed copper, comply with IEC 60228 for Class 1
- Insulation: Polythene (PE), comply with IEC 60708
- Core Identification: 1 pair – red, black
2 pair – red, yellow, blue, black laid up in quad formation in order of rotation
- Screen (for Non Armoured Cable Only)): Aluminum polymer laminate tape comply with IEC 60708
- Inner Sheath (for Armoured Cable Only): Medium density polyethylene (MDPE), comply with IEC 60708
- Armor (for Armoured Cable Only): Galvanized steel wires to BS EN 10257-1
- Outer Sheath: Medium density polyethylene (MDPE), comply with IEC 60708.
- Outer Sheath Color: Orange/Black

Non Armored TR2031 TRAFFIC CONTROL CABLE

Technical Characteristics

- Rated voltage: 600/Kft volts
- Minimum bending radius: 8 x O
- Rated temperature: +70o C
- Conductor resistance at 20°C: 1.5mm2---- 12.1ohms/km
2.5mm2---- 7.41ohms/km
- Insulation resistance: >1500 MO x km
- Loop inductance: 630uH/km(1P) 720uH/km(2P)
- Capacitance:

unarmored armored
1.5 mm2 2.5 mm2 1.5 mm2 2.5 mm2
<75 pF/m (1P) pF/m 64 pF/m (1P)
52 pF/m (2P) 53.5 pF/m (2P)

-Current rating

Unarmored in air (30°C) armored in ground (15oC, 1.2oC m/W)
1.5 mm2 2.5 mm2 1.5 mm2 2.5 mm2
24* 33* 32* 41*

*These ratings are based on only two cores loaded simultaneously. In two pair cables where all four cores could be loaded simultaneously, the above values should be multiplied by 0.78.

Cable Parameter

Number
of
Pairs
Nominal
Conductor
Area
Nominal
Conductor
Stranding
Insulation
Thickness
Inner
Sheath
Thickness
Nominal
diameter of
armour wire
Outer
Sheath
Thickness
Nominal O/D Approx
Cable Weight
mm2 NO./mm mm mm mm mm mm Kg/km
Unarmored cables
1 1.5 1/1.38 0.70 - - 1.4 7.5 92
2 (Q) 1.5 1/1.38 0.70 - - 1.4 12.0 173
1 2.5 1/1.78 0.70 - - 1.4 8.1 121
2 (Q) 2.5 1/1.78 0.70 - - 1.4 13.3 231
Armored cables
1 1.5 1/1.38 0.70 0.7 0.9 1.4 10.6 255
2 (Q) 1.5 1/1.38 0.70 0.7 0.9 1.4 11.5 327
1 2.5 1/1.78 0.70 0.7 0.9 1.4 11.2 296
2 (Q) 2.5 1/1.78 0.70 0.7 0.9 1.4 12.3 395