Cable protection PVC pipes with smooth socket

The two classes are the result of cable protection pipe classification according to their strength to impact as follows:

Class L = light working conditions (at least 9 samples pass the impact resistance test with the 3kg hammer).

Class N = normal working conditions (at least 9 samples pass the impact resistance test with the 5 kg hammer).

Besides this classification, there is a classification depending on the compressive strength. Both Class L and Class N pipes are rated for compressive strength according to the following values: 250, 450 or 750 N. The class and impact resistance must be marked on the PVC pipes for cable protection. The diameter range is between 32 and 140 mm for Class L pipes and 63 and 250 mm for Class N pipes. The pipes are produced in bars, especially 6 m in length, but for some diameters they are also produced at a length of 4 m.