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Wot is the best design package for control panels. Autocad is good but expensive.
I couldn't find out how much it costs if you did need to buy it though (Siemens website sent me around in circles), but I'll admit I didn't try too hard!
Next down in cost is Inventor (also rental only), then Solidworks, then Radan. I looked at over 15 systems - there are a lot out there!
For proper but affordable 2D try Bricscad (bricsys.com). If you are only drawing schematics that will be fine.
Some will only accept drawings completed in for example e-Plan, I believe that is all JLR accept. This is sometimes to do with back-office integration, sometimes to do with common formats, standard designs perhaps in the way of macro's that are supplied by the client for the integrator to use.
There are a few out there that specialise in schematics with varying levels of sophistication and automation.
It depends on whether you are designing several different panels a day, and whether these are variations on a theme, or whether you do one a month which takes all month, or whether you do two or three a year which take a day each.
Note: It is US-based, so defaults to US units, but you can easily change that to metric in the setup.