How to choose the right diameter of marking tube?
Marking tubes are available in a wide range of diameters. This allows you to choose a suitable tube, which can be easily slid onto the wire, but at the same time will not be too loose. Therefore, we recommend paying great attention to the selection of the correct tube diameter.
How to do it?
The easiest way is not choosing the tube only based on the cross-section of the wire (mm2), but paying more attention to the overall outer diameter of the wire (mm). Each wire may have different thicknesses of insulation and the overall outer diameter may therefore be different even for wires with the same cross-section.
To facilitate the selection of the tube, we have created the following table, where the approximate diameter of the tube is given for each wire cross-section.
| Tube diameter (mm) | Wire cross section (mm²) |
| 2,0 | 0,24 - 0,5 |
| 2,5 | 0,5 - 0,75 |
| 3,0 | 1,0 |
| 3,5 | 1,5 |
| 4,0 | 2,5 |
| 4,5 | 4,0 |
| 5,0 | 4,0 - 6,0 |
| 5,5 | 6,0 |
| 6,0 | 10,0 |
These diameters are the most common choice and are generally satisfactory. However, as mentioned above, due to the different insulation thickness, it may not be absolutely valid for all types of wires from different manufacturers.
If you are hesitant and not sure which diameter to choose, we will be happy to send you samples of tubes with all available diameters.