1. Consider the purpose of system
Determine whether the system is required to support or protect cables. Where single insulated (non-sheathed) cables are used, extra mechanical protection is required, usually to a specific IP rating. Metallic distribution trunking is ideal for this and also tamper-proofs essential supplies.
2. Check level of robustness needed
The location of the installation determines the robustness of the product. For marine, coastal or industrial settings where there may be corrosive elements, for example, a deep galvanised or stainless steel product will maximise the service life of the installation. If cable management is installed outdoors, check UV resistance.
3. Avoid over–specifying
While cable ladder is usually required for the HV cabling that brings the mains supply into the building and is often used as a spine feed in larger buildings, perforated steel tray or steel wire tray may be more appropriate for the small power, lighting supply and data cabling.
4. Calculate the total load
The total load should be calculated using the weight of the cables, any ancillary items that are subsequently fitted and appropriate dynamic loads such as wind or snow. This weight needs to be worked out as a uniformly distributed load (UDL). Caution should be applied to any point loads as a point load placed at the centre of a span can have the effect of doubling the UDL.
5. Consider cost–effectiveness
The cost of a cable management installation should be based on whole life, installed costs. Care should be taken to consider the cost of the containment, the cost and number of required supports, the speed of installation and the labour rate, training requirements and waste products.
By Nigel Leaver, marketing manager, Legrand’s cable management business unit
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