My client is interested in removing ventilation and reducing the wire size within a concrete trench or trough.
Could it be confirmed whether the NEC (or California CEC) permits the installation of
6 sets of 4 parallel 3c-2/0+G XHHW conductors (480V, 3-phase, 140A FLA continuous load) in a triangular configuration, with 2.15 OD spacing, placed on racks within an unventilated concrete trough(50ft length, 5 feet in width and 4 feet interior depth)?
I felt the heat in this trough already, but can I go even with a smaller wire?
Or NEC does not allow it to be non-ventilated.
NEC 392.80(2)— is this the correct section to reference? since this is rack mounted, or should another part of the code be considered?
Thank you all.
Could it be confirmed whether the NEC (or California CEC) permits the installation of
6 sets of 4 parallel 3c-2/0+G XHHW conductors (480V, 3-phase, 140A FLA continuous load) in a triangular configuration, with 2.15 OD spacing, placed on racks within an unventilated concrete trough(50ft length, 5 feet in width and 4 feet interior depth)?
I felt the heat in this trough already, but can I go even with a smaller wire?
Or NEC does not allow it to be non-ventilated.
NEC 392.80(2)— is this the correct section to reference? since this is rack mounted, or should another part of the code be considered?
Thank you all.