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Recommendation for filling grade, relevant guidelines

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With the use of cable protection systems there is often the question regarding the filling grade resp. filling factor. This describes how strong a cable protection conduit can be filled or shall be filled with cables and / or wires relating to the available cross section.

Basically, PMA recommends not to overstep the filling grade of 70% (application specific guidelines and standards have to be additionally considered). The function manner has not been unnecessarily affected through increased friction between the single wires at dynamically moved systems. Furthermore, an after installation of additional wires and / or cables is made possible if there is a requirement.