In most countrys there are regulations in place for commercial machinery as far as E-stops, but the thing that really bugs me, fortunately it is rare, there are still manufacturers that shut the whole machine down with e-stop, including the CNC control
There is absolutly no need for this which makes trouble shooting a nightmare, when I install a system, I not only leave the CNC unit on, which reduces the work of re-zeroing the machine but I also leave the inputs active, they are mostly low voltage anyway, this way, on a CNC machine at least the input logic can be seen in its active state.
I just shut of the supply to the CNC outputs and supply to contactors, motors, and all moving parts, as per the code.
Al.