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How to choose the right cable support by understanding relationship between load and span

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article image Understanding the relationship between load and span will help buyers choose the right cable support products

EzyStrut advises buyers of struts or cable support products to first understand the relationship between load and span. Having this understanding will help them choose the right strut or cable support product.

Lengths of struts, cable trays or cable ladders can support more weight, and exhibit less deflection at their maximum allowed load, when they are covering a shorter span.

For instance, in the case of electrical products such as cable trays or ladders (load rated in kilograms per metre), the span is the distance between support points, separate from the overall length of the tray or ladder itself. Support points are often trapezes suspended from threaded rods, cantilever brackets, or other strut systems.

Typically, when the desired load is higher, the maximum allowable spans become shorter, because shorter spans can support more weight per metre. Shorter spans also result in less deflection of the installed product.

However, if longer spans are required with less fixing points for the tray or ladder, one can reduce the maximum load per metre allowable over the longer span. When the maximum load per metre of a certain product is not needed, the installation can often simply use longer spans and less support points.

Support span is the distance between support points for the tray, mesh or ladder. Overall length is the total length of the tray or ladder regardless of the number of supports.

A shorter support span results in higher requirement for support points, higher load capability, and less deflection.

A longer support span results in lower requirement for support points, lower load capability, and greater deflection.

Before making a decision, check individual product specifications against specific site requirements.

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