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* Not an electrician *Looks sensible to me. My preference - if you are going to call it an 'E-stop' - is to isolate at the incoming lines rather than the feed to the contactors. If one of the contactors crapped itself and melted closed the e-stop won't work. You could only isolate the active but leave this up to your sparky mate to determine, he'll know the standard/s and best practice.
* Not an electrician *
Looks sensible to me. My preference - if you are going to call it an 'E-stop' - is to isolate at the incoming lines rather than the feed to the contactors. If one of the contactors crapped itself and melted closed the e-stop won't work. You could only isolate the active but leave this up to your sparky mate to determine, he'll know the standard/s and best practice.