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.
Cable tray support calculation.
Then according to cable tray support configuration a structural engineer may calculate the actual load on each support rod and according to rod material.
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.
On tue dec 2 2014 at 7 52 pm electrical notes articles wrote.
A 50 fill ratio should equal the maximum number of cables pulled in a given cross section.
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.
The installation will use cat cable at 19 in diameter 20 lb.
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.
Straight section supports installed at 5 foot 1 5m centers are typical.