I have a question regarding the NEC and the conduit fill ratio. The NEC recommends the cable fill ratio remains under 40% for two or more cables. What is the reasoning to limit the allowable fill ratio to 40%? What problems could occur if the 40% fill ratio is exceeded?
I'm a fairly new engineer working for the local power company. I have been tasked with sizing an underground run for a mobile substation. Unfortunately, I didn't have any power courses in college, so I have spent some time researching equations. Can anyone provide a website or an equation to...
