Rev.00 - 09.2018 | LDP1/LDP2 Single and Dual Loop Detector | © 2018 |
CARLO GAVAZZI Industri
19
EN
7.1.4. Wire Specifications
Any coil of insulated cooper wire can be used. There are many copper wires in the market that marked
suitable for loop detector application.
Recommended wire will be following but not restricted to:
I. Conductor cross sectional area of 1.5mm2
II. Thinned flexible copper conductor Class 5
III. Ethylene Propylene Rubber (EPR) insulation
IV. Polychloroprene (PCP) sheath
V. Voltage rating 600/1000v
VI. High temperature limit of around 85° for durability outdoor
VII. Bending radius of 6 x overall diameter
VIII. UV resistant
IX. Halogen free
7.2. Loop Installation
After determining the loop geometry, groove must be cut into the ground to install the loop. This can
be done by using a concrete cutting disc saw or similar device.
Clean the groove to make sure it is free of debris and free from moisture.
Place the wire along the groove and make sure it fitted tightly and nicely into the groove.
Measure the loop inductance using an inductance meter. Recommended value is between 80 to
300µH.
Seal the groove with any suitable epoxy or loop sealant found in the market.
Make sure when sealing the groove:
I. The temperature of the sealing compound does not exceed the temperature of the loop wire
insulation as this might melt the insulation and causes earth fault.
II. The loop wire must be totally fitted into the slot and not able to move after sealing.
III. The loop wire is placed nicely into the slot and no any section is exposed after sealing.
IV. The groove is clean and dry during sealing.
