Cable Tray Support Calculation

Just prior to installation there became a concern over the amount of cable weight in the tray aprox 78lbs ft and how to best support the cable tray for the total amount of weight. On tue dec 2 2014 at 7 52 pm electrical notes articles wrote. The installation will use cat cable at 19 in diameter 20 lb.

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Cable raceway tray support calculations cable tray is sized based on the number and type of cables required for the current and future need.

Cable tray support calculation.

The design for this project specified the size and quantify of the feeders to be routed overhead and left the actual routing of the feeders up to the contractor. Calculate cable tray width calculate cable tray area calculate cable tray length calculate cable tray weight calculate remaining width of cable tray calculate remaining area of cable tray free download. Then according to cable tray support configuration a structural engineer may calculate the actual load on each support rod and according to rod material. A cable tray manufacturer has to provide the cable tray parts data as width height weight.

A 50 fill ratio should equal the maximum number of cables pulled in a given cross section. Straight section supports installed at 5 foot 1 5m centers are typical. Quick tray wire mesh cable tray fill table at 50 fill use the following formula to calculate the number of cables that will result in a particular fill ratio where. Steel fiberglass or else to state the right diameter.

A inside tray area in in 2 d cable diameter in inches f fill ratio in n number of cables the formula is n f a 100 d 2 2 π example.

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