The cover is attached with 3 pairs of twist locks under the side rail. From a width of 500 mm, a cross bead is punched in for stabilization. The cover protects the inserted cables from external influences such as mechanical damage, sunlight, moisture, dust and improves the shielding attenuation. Suitable as an accessory in functional integrity systems of classes E30 to E90 according to DIN 4102 Part 12. For installation variants and approval data, see the usability certificates.