I'm looking for input on "bundling" issues with underground. 310.60 and Annex B are the areas in the code given to me on this issue. Annex B is null. 310.60 IMHO deals with voltages of 2001 to 35,000. I am running mostly 120v with few 480/277. I do have a lot of pipes but I am being required to keep a seperation even with 10 or so 3/4" pipes. I'm just looking for some input.