Good day all,
I am working on a project and trying to figure out the clearance in this special case. Please advise if you have any experience on this matter. Please forgive my English since this is not my mother language.
Here is the situation,
We want to pull the 230kV cable from switchyard to substation, the routing path will cross the railroad, there is a bridge built on top of the railroad crossing with 24' clearance. The 230kV cable is fully insulated, grounded armored cable and we will build a cable rack and place cable tray on top then run the cable. The preliminary cable rack is about 10' height in our complex. When crossing the bridge, we want to attach the cable rack to the bridge as a support and save some cost. Now we are considering the clearance but don't know if our case should follow the overhead line clearance (NEC 225.60, NESC 232). If we follow the OHL code, the clearance will be 34.1' from the railroad, which means I can't attach the cable rack to the bridge.
Below are my questions:
1. Our cable is fully insulated armored cable and intend to place on cable rack and tray. In this case can I claim the cable is not a overhead line?
2. If this is not a overhead line, is there other clearance requirement should I follow to best match the NEC/ NESC code?
I really appreciate your time and any valuable input.
Thanks,
J.P.
I am working on a project and trying to figure out the clearance in this special case. Please advise if you have any experience on this matter. Please forgive my English since this is not my mother language.
Here is the situation,
We want to pull the 230kV cable from switchyard to substation, the routing path will cross the railroad, there is a bridge built on top of the railroad crossing with 24' clearance. The 230kV cable is fully insulated, grounded armored cable and we will build a cable rack and place cable tray on top then run the cable. The preliminary cable rack is about 10' height in our complex. When crossing the bridge, we want to attach the cable rack to the bridge as a support and save some cost. Now we are considering the clearance but don't know if our case should follow the overhead line clearance (NEC 225.60, NESC 232). If we follow the OHL code, the clearance will be 34.1' from the railroad, which means I can't attach the cable rack to the bridge.
Below are my questions:
1. Our cable is fully insulated armored cable and intend to place on cable rack and tray. In this case can I claim the cable is not a overhead line?
2. If this is not a overhead line, is there other clearance requirement should I follow to best match the NEC/ NESC code?
I really appreciate your time and any valuable input.
Thanks,
J.P.