Efficient engineering is all about setting up a good project structure and generate the appropriate documentation within the correct timeframe.
Therefor electrical design is done most efficiently with Eplan; We have a predefined library available for your needs and devices can be added quickly according to project specifications. Because time is rarely a positive factor. Accuracy is in any circumstance maintained though.
AutoCad on the other hand is widely used, and CMJ-engineering has a wide variety of blocks that can be inserted with a predefined number of attributes. Besides this library, through scripting, multiple files can be processed at once. Again: time saving!
IEC symbols standard is always applied.