We are installing conductors into a large switch gear unit at work. They are terminating into 2 of 600 amp switches and 1 of 800 amp switch. The wires are 500 kcmil 4 conductor cable parallel feeds( 28 conductors total. We are tie wrapping all 28 conductors together for approximately 1.5 meters together(all touching) in the switchgear along the side of the unit.
The debate we are having is:
Is there a derating factor b/c of the bundling of the 28 conductors along 1.5 meters?
What is code rule on this?
