2
0
1
6
-1
1
12
Manual LC10-*
Installation
4
Installation
4.1
Preparation
4.1.1
Laying loops
Laying loops in asphalt or concrete floors
When laying loops in asphalt or concrete floors the loop can be produced in commercial grade
insulated copper braid HO7V-K1.5(NYAF) with a cross section of 1.5 mm
²
.
A groove approx. 8 mm wide and 30 - 40 mm deep is cut into the floor. The groove must be
cleared of all residue and the wires of the loop inserted as deep as possible and fixed in place.
The groove is then refilled with artificial resin or bitumen.
The connection lead for the loop is twisted (at least 20 times per meter) and then also laid in a
groove or a conduit to the loop detector. The connection lead should not exceed a length of
max. 150 m.
Laying loops under composite paving
When laying loops under composite paving the loop must be laid permanently in a plastic pipe
in a sand bed. We recommend to lay the loops in a plastic conduit. The loop must not be laid in
groove cut into the composite paving.
4.1.2
Number of loop windings
The induction loop consists of several copper wire windings which are inserted into the floor
groove. The number of windings depends on the size of the loop and can be calculated from
the loop circumference in accordance with the following table. Loop circumference
U:
U=2a+2b
Figure 4.1
e.g.: a = 3 m; b = 1 m; U = 2 x 3 m + 2 x 1 m = 8 m; Number of windings = 4
8 mm
30 ....
40 mm
Composite pavement
Layer of sand
Completed loop
Loop circumference
Number of windings
2 - 4 meters
6
4 - 7 meters
5
8 - 12 meters
4
13 - 25 meters
3
a
b
