Highway Cables

National Motorway Communications System Specifications(TR Series)

TR2029-Inductive Loop Detector Cable

Application and Description :

TR2029 inductive loop detector cable is a single core multistranded flexible cable sheathed with polychloroprene

designed for installation in a slot cut into the carriageway. It is used to measure and control traffic flow. The

cables are buried beneath the road in 'loops' and an electrical current is passed through them creating a

magnetic inductive field. the vehicle passing through this field that creates a disturbance and a means by which

to measure traffic flow and vehicle type. Typical applications are for traffic control signals, safety cameras,

variable speed control systems, flow monitoring and access control. The cables have to be of a robust design to

withstand a hostile working environment and accommodate back filling with hot bitumen during cable pulling.

Standard :

TR2029, IEC 60811 and BS 6500, BS EN 60332-1-2

Cable Construction:


Conductor: Tin coated plain annealed copper, comply with IEC 60228 for Class 5

Insulation: Ethylene propylene rubber (EPR), GP1, 85 º C, comply with BS 7655

Insulation Color: Black

Sheath: Polychloroprene(PCP), RS3, 85 º C, comply with BS 7655,heavy-duty, oil-resisting and flame retardant

Sheath Color: Black

Technical Characteristics :

Rated voltage: 450/750 volts

Minimum bending radius: 5 x Ø

Rated temperature: +90º C

Conductor resistance at 20°C: 1.5mm2---- 13.7ohms/km

2.5mm2---- 8.21ohms/km

Insulation resistance: >665 MO x km

Flame retardant: BS EN 60332-1-2

Cable Parameter :

Conductor Area
Conductor Stranding
Insulation Thickness Sheath Thickness Nominal O/D Approx
Cable Weight
mm2 NO./mm mm mm mm Kg/km
EPR insulation only
1 1.5 30/0.25 1.1 - 3.8-4.0 30
1 2.5 50/0.25 2.1 - 6.1-6.4 48
EPR insulation with PCP sheath
1 1.5 30/0.25 0.8 1.4 5.8-7.2 65