PTR

Ladder type trays (PTR) are our workhorse, which grant a high load capacity even with reduced thicknesses and result in cost reduction and easy handling during installation.

This type of cable tray is particularly suitable for medium and large sized cables, providing great capacity and the proper ventilation.

Our PTR is assembled by robotized welding with MAG process between side-rail and rung, granting high quality and reliability standards, a very important requirement in the most demanding sectors such as construction and Oil & Gas.

Technical Notes

PTR trays are designed and manufactured in accordance with the CEI EN 61537 Class 23-76 standard and can be manufactured made of: 

• carbon steel S235JR (UNI EN 10025) hot dip galvanized after working (ISO 1461)
• stainless steel AISI 304
• stainless steel AISI 316L
• aluminium

Bending radii of special pieces take into consideration the CEI 11-17 standard, which settles the minimum bending radius according to cable's diameter: on request, we can supply bending radii other than our standard (600 mm).

Standard covers are plane type and 1.00 mm thick: on request, we can supply different thickness and shapes (flowing type, reinforced, ventilation louvers, draining holes...).

Capacity Load

PTR trays have been tested through strict tests, to define the maximum admissible load (SWL – Safe Working Load) in compliance with the CEI EN 61537 standard.

In our catalogue, that you can find in the dedicated area (download catalogues), there are the diagrams which define, according to the distance between supports, the maximum admissible distributed load (UDL – Uniformly Distributed Load) and the maximum admissible load considering an additional concentrated load (CL – Concentrated Load): as concentrated load, we consider a load of 900 N added in the middle span with respect to the supports.

The CEI EN 61537 standard states that the maximum acceptable longitudinal inflexion is 1/100 of the distance between supports, and that the maximum acceptable transversal one is 1/20 of tray width: the inflection of PTR trays under load (UDL) falls within these parameters.