single line diagram

My project involves creating a single line diagram. The diagram is meant to be a high level overview of the electrical system designed. It does not require the use of a certain type of software, so ability to experts in preparing and analyzing the diagram with multiple solutions will be a big plus. Any software used should be compatible with industry standards and must be able to produce high quality visuals. I need someone who is experienced in this kind of problem-solving and is able to deliver a comprehensive and accurate final product.