Ty.Jackson68
Member
- Location
- Texas
- Occupation
- Engineer
Looking for guidance. Have an instance where we need to run multiple cable trays in a utilidor.
The utilidor will have an open grating cover - freely allowing heat to dissipate (nominally 1/2" wide x 1" openings, continuous along the length of the utilidor).
The utilidor is pre-cast concrete on three sides (base, and 2 walls).
There would 3 cable trays mounted off one wall in a stacked configuration. 12" spacing between cable tray siderails.
Would this arrangement be considered impinging on "free air"?
Obviously, MC cable stacking in the cable tray would also have to be considered. The question is - does the placement of the tray in the open top utilidor add any considerations beyond normal calculations for cable spacing (random vs. spaced) and the ambient outdoor conditions. In this case - the ability for a "breeze" to be present is diminished in comparison to cable trays mounted in traditional fashion to structure above ground.
The utilidor will have an open grating cover - freely allowing heat to dissipate (nominally 1/2" wide x 1" openings, continuous along the length of the utilidor).
The utilidor is pre-cast concrete on three sides (base, and 2 walls).
There would 3 cable trays mounted off one wall in a stacked configuration. 12" spacing between cable tray siderails.
Would this arrangement be considered impinging on "free air"?
Obviously, MC cable stacking in the cable tray would also have to be considered. The question is - does the placement of the tray in the open top utilidor add any considerations beyond normal calculations for cable spacing (random vs. spaced) and the ambient outdoor conditions. In this case - the ability for a "breeze" to be present is diminished in comparison to cable trays mounted in traditional fashion to structure above ground.