We're building a 400 amp service and met with the POCO engineer today and she said that they require CT's on any commercial service over 200. I mainly work in another POCO jusrisdiction, and they went to 400 amp meter bases at least ten years ago. I think they even have 600's. I was told that it was much more accurate than CT's, but she held fast onto her CT's as best. Any opinions?
Gunther, you are asking a question that appears to be geographically-based, but you don't have your location indicated in your profile or in your post. It's kind of hard for us to help you if we don't know where you are located since POCO policies vary greatly in different parts of the country.