I?m running a 400amp circuit to a 480 volt sub panel located about 40 feet outside our manufacturing plant. This panel will feed pumps and other equipment with a connected load of about 160 amps. We will need the extra power for future equipment and for R&D experiments.
I plan to install 8 foot pipe racks that will support the feeder, control wire conduits, and water pipes. The circuit will be two sets of 3/0 THHN in two conduits. Because this is over concrete and there will be many modifications in the future I don?t want to run the power underground.
310.15(B)(2)(C) refers to an ASHRAE table to determine the ambient temperature for rooftops. The 2% ASHRAE design temperature for my area is 95 degrees Fahrenheit. Is this the temperature I use for de-rating my wire in the 90 degree column of 310.16? Are there no other code requirements for conductors in direct sunlight?
This may be a stupid question, but I don?t get outside much?.
I plan to install 8 foot pipe racks that will support the feeder, control wire conduits, and water pipes. The circuit will be two sets of 3/0 THHN in two conduits. Because this is over concrete and there will be many modifications in the future I don?t want to run the power underground.
310.15(B)(2)(C) refers to an ASHRAE table to determine the ambient temperature for rooftops. The 2% ASHRAE design temperature for my area is 95 degrees Fahrenheit. Is this the temperature I use for de-rating my wire in the 90 degree column of 310.16? Are there no other code requirements for conductors in direct sunlight?
This may be a stupid question, but I don?t get outside much?.