There should be a ground wire going to the frame of the machine. If not ,
it probably is not installed by the electric code. Even a 480 V 3 phase
system must have the frame of the equipment connected to an earth ground for
Where I work there are several thousand pieces of 3 phase equipment. All of
it has a "green wire", many times a bare wire that will run back to a ground
point. We make polyester material, and also make some chip that is
transfered from one place to another. All of the pipes that convey the chip
is grounded and checked several times a year to make sure it is grounded.
That is for the static safety.
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