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.
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.
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.
On tue dec 2 2014 at 7 52 pm electrical notes articles wrote.
A cable tray manufacturer has to provide the cable tray parts data as width height weight.
Then according to cable tray support configuration a structural engineer may calculate the actual load on each support rod and according to rod material.
Steel fiberglass or else to state the right diameter.
The installation will use cat cable at 19 in diameter 20 lb.
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.