BS EN 12613:2021 pdf free download – Plastics warning devices for underground cables and pipelines with visual characteristics.
The internal perimeter of an opening shall be 360 mm. The minimum width of the strands shall be:
— > 1 mm when the internal perimeter of the opening is < 160 mm; — >= 2mm when the internal perimeter of the opening is  160 mm.
It is recommended that the minimum reel length is equal or greater than 100 m or as agreed between the manufacturer and the purchaser.
5.4 Laying characteristics
5.4.1 General
For ease of use, the warning devices need sufficient flatness and longitudinal mechanical strength to maintain their shape.
5.4.2 Tensile withstand strength
When tested in accordance with 6.3, the type 1 warning device shall withstand a load of 200 N during I mm in longitudinal direction, without starting of the separation of the weak points, if any, and shall not exhibit a reduction of more than 20 % of its width after removal of the load.
When tested in accordance with 6.3, the type 2 warning device shall withstand a load of 300 N during 1 mm in longitudinal direction, without starting of the separation of the weak points, if any, and shall not exhibit a reduction of more than 20 % of its width after removal of the load.
5.4.3 Flatness
When tested in accordance with 6.4, the warning device shall not exhibit a gap between any point of the warning device and the reference surface greater than Wo /4.
5.5 Visual warning characteristics
The visual characteristics of the warning devices are assessed by means of a test which simulates the opening of a trench with the bucket of an excavator (see A.1).
When tested in accordance with Annex A, the warning device shall exhibit at least one single part of a minimum length of 200 mm outside of the movable plate (which simulates the bucket) and at least one single part of a minimum length of 200 mm in the frame (which simulate the trench). In the case of absence of rupture between the movable plate and at least one side of the frame, the warning device is deemed to satisf’ the requirement of this subclause. The width of the visible parts of warning device shall be greater or equal to 2 mm.
6.2 Determination of the colour fastness
Three separate tests shall be carried out in accordance with:
a) Annex B, by immersion in an aqueous solution with 20 % by mass of ammonium sulphide;
b) EN ISO 175, by immersion in nitric acid with a concentration of 10 % by mass;
c) EN ISO 175, by immersion in a sodium carbonate solution with a concentration of 20 % by mass.
6.3 Determination of the tensile withstand strength
6.3.1 Test pieces
The length 01 the test pieces used to determine the tensile withstand strength depends on the presence or not of weak points on the warning device.
If the warning device has weak points distributed at repeated intervals (see Figure 1), the length of the test pieces L shall be such that the test pieces each include a complete sequence of weak points distributed along their entire width W. lithe warning device has no weak points, the length of the test pieces shall be greater than or equal to 500 mm.