bdn2004
Electrical
- Jan 27, 2007
- 799
We're in the process of designing some cable tray/conduit system in a highly congested basement space of an industrial plant. There are approximately 200 cables of various sizes on the project. An all conduit design would be considerably more expensive and is not being considered.
The proposed cable tray routes show long straight pieces of tray. But to get around the obstacles the design the cables simply swung into the next long straight piece unsupported.
All the tray is bonded together with a #4/0 ground cable. All of the cable is tray rated but is not armored.
I don't think it looks particularly good...but with all the constaints in space it seems like a reasonable design and is definitely the cheapest way to do it.
But can you do this? ...leave all tray cable unsupported for 2'-3'? What I would like to see is cable tray fittings to make these elevation changes...but again they cost extra $$ that they don't want to spend if they don't have to.
Thanks.
The proposed cable tray routes show long straight pieces of tray. But to get around the obstacles the design the cables simply swung into the next long straight piece unsupported.
All the tray is bonded together with a #4/0 ground cable. All of the cable is tray rated but is not armored.
I don't think it looks particularly good...but with all the constaints in space it seems like a reasonable design and is definitely the cheapest way to do it.
But can you do this? ...leave all tray cable unsupported for 2'-3'? What I would like to see is cable tray fittings to make these elevation changes...but again they cost extra $$ that they don't want to spend if they don't have to.
Thanks.