Lateral connection joint

Perforated Cable trays with rimmed ribs PFLR type have been tested through strict tests, to define the maximum admissible load (SWL – Safe Working Load) in compliance with the CEI EN 61537 standard; please find please find herewith enclosed 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 800 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 Perforated Cable trays with rimmed ribs PFLR type under load (UDL) falls within these parameters.

Perforated Cable trays with rimmed ribs PFLR type have been tested to verify the electrical continuity in accordance with CEI EN 61537 standard.
The test consists in the passage all along the elements of a 25A electric current, with a frequency between 50 and 60 Hz; the voltage drop must be measured both through the joint and on the whole tray, therefore:

• between two points, 50 mm away from each side of the joint;
• between two points, on one side 500 mm away from the joint.

The measured impedances shouldn’t exceed 50 mΩ through the joint and 5 mΩ per metre without the joint.
The test has been carried out on two straight elements connected by one joint fixed by 8 cup square screws M6x12.