Thanks for the responses. I suspected the fill ratio limitation had to do with heat dissipation, however I wanted to confirm it. I couldn't find the info anywhere, and I didn't want to accept something without knowing the reasoning behind it.
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?
Thanks for the responses so far. The Mike Holt spreadsheets are informative but do not fully apply to my situation (limited due to the voltage level). The voltage is 34500 (phase-to-phase). The assumed PF is 0.9. I was at the proposed site today and the length of the cable run is...
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...
