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By ones above that I mean for above 35,000 volts. Utilities are exempt from the NEC and the NEC does not generally apply to voltages above 35kV. I am looking for an IEEE or IEC justification.

I found the section in the NEC you referenced. That does help me for 34.5kV circuits. Now I need some help for the ones above that. My problem is I am being forced to use a deeper depth as my controlling one for cable selection. When you have a 2000' run of conduit that is 3' to top of concrete...

We do a good deal of underground cable calculations in conduit for voltages between 12kV and 230kV. We use a program called CYMCAP made by CYME (now owned by Eaton). At riser poles and transitions, you often have to dive a good bit deeper to fit in the 90 degree turn of the conduit. This causes...

Thanks! I have IEEE 80. I must have missed the section you are referring to.

Thanks for the response. Can you direct me to the IEEE standard you are referencing?

I have a question about a 27kV ground switch we are installing in a HV yard. My substation technicians are having an issue with a ground cable we are being made to use. This company's standard is to use copper clad cable, which makes the cable OD much bigger than it would be with soft drawn...

I appreciate that. However, these are something we are starting to see more off in our jobs. I am a PE and have more on staff that work for me. We need to learn how to do these. So, I am interested in information on exactly what one entails so I can go forward with adding this ability to our...

I need a little enlightment here if possible. On a new project we have in house I am being asked to perform some new studies I have never done before. This is for a high voltage substation. We are used to doing ground grid studies, bus designs, lightning protection and the such. The studies I...