Cable Tray Support Span Calculation

A typical multi span cable ladder or cable tray installation behaves largely as a continuous beam.

Cable tray support span calculation. Support load calculation per iec 61537 one or more spans iec 61537 7 3i. The nema classes are based on cable loads of 50 75 and 100 per lineal foot. Installation of support structure 09 section d 3. The greater the number of spans the closer the similarity.

Straight length installation 16 section d 4. On tue dec 2 2014 at 7 52 pm electrical notes articles wrote. This classification is based on the working load the total weight of the cables and the support span the distance between supports. Support of cable tray and ladder is typically done in the same fashion as us installations but generally has fewer restrictions as to loading design.

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. 610mm of a splice on straight sections and the span between supports should not exceed the length of tray. Intermediate support for upper tray required on piperacks over 6096mm wide. Cable load working load the cable load or the working load is the total weight of the cables to be placed in the tray.

Introduction 02 section b. 1 table of contents 02 section a. Installation 03 section d 1. For support spans greater than 5 feet 1 5m cable loads must be evaluated to ensure that the span between the supports is suitable for the load the support and anchor must be evaluated separately.

Supports should be placed within 24 in. Cable support systems in the international world iec61537 2004. Fittings installation 23 section d 5. However in practice a run must contain joints and it can also never be of infinite length so it is important to appreciate how its characteristics vary from span to span and how these.

Receiving and unloading 03 section c. Field modifications 25 section d 6. Common tools for installation 04 section d 2. 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.

Vertical cable tray elbows at the top of runs should be supported at the joint on each end. Storage 03 section d. Ancillary products accessories. Vertical cable tray elbows at the bottom of runs should be supported at the top of the elbow and within 610mm of the joint at the bottom of the elbow.