![]() ![]() ![]() As they are generally of steel construction, this is usually enough to carry the load without too much concern (providing suitable supports are in place). Often, cable ladder or tray systems are installed to carry only light cable loads. Consequently, only cables where mechanical protection is provided by a suitable sheath, for example, PVC sheathing or steel wire armouring, can be used in conjunction with ladder and tray systems. This means that the installation of non-sheathed conductors is not permitted as this would breach Regulation 521.10.1, which requires non-sheathed cables to be enclosed. Ladder and tray systems differ slightly from conduit and trunking systems in that they are not enclosures, and they do not provide mechanical protection, only cable support. In this article, we take a look at cable ladder systems and cable tray systems. In some of our recent articles for Professional Electrician, I’ve looked at installation requirements for conduit and trunking systems. In the first of a two-part series of articles, Technical Events Manager and Technical Author of NAPIT On-site Solutions, Paul Chaffers, takes a closer look at some of the important design considerations for cable ladder and tray systems.
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