In the case of electrical products such as cable tray or ladder which are 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.
Cable tray support span distance.
This classification is based on the working load the total weight of the cables and the support span the distance between supports.
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Span the distance between supports and load the maximum cable weight dictate the load capacity of a cable support system.
The nema standard.
This is the total weight of cables in the tray.
Section 2 manufacturing standards 2 1 materials.
Cable tray support span the distance between the center lines of supports.
The basic types of cable tray supports are.
Support load calculation per iec 61537 one or more spans iec 61537 7 3i.
6 cable ladder and cable tray systems including channel support systems and other associated supports definitions and abbreviations accessory component used for a supplementary function e g.
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To join two components together clamp or fix to walls ceilings or other supports covers and cable retainers associated supports bespoke supports for cable tray and cable ladder other than bs 6946 channel.
The maximum cable load allowed on the system is called the load capacity.
For flexible systems where the cable is not directly fixed to the support system for example a j hanger installation calculations need to be undertaken to determine the required distance between the cable support positions to achieve a set deflection off set.
The nema classes are based on cable loads of 50 75 and 100 per lineal foot.
Cable support systems in the international world iec61537 2004.
Cantilever bracket trapeze single rod suspension.
For purposes of selecting a suitable tray this weight should be rounded off to the next higher nema working allowable load.
Support spans support span is the distance between the supports.
Cable tray systems 1 3 tec nema class hnical data the nema classifications for cable tray were established to simplify and standardize the specification of cable tray.
Cable supports should be applied either side of the bend.
Different standards may use different terms when referring to load capacity but it all boils down to span and cable weight.
