I'm trying to run some 4-20ma signal about 15 feet through some conduit. I have basically two options. There is an existing 1/2" stainless steel conduit that is already running in the path that I need it to go, but there are two 110v controls lines running to a vfd. Would it be safe to run the 4-20 if I used some properly shielded cable? If so, would some 2-conductor twisted pair cable work? If running it through this same conduit is not a reality, then would it be safe to run a separate stainless steel conduit parallel to the existing conduit? Because of spacial constraints, this conduit would need to be about an inch or two away from the existing conduit line. Thanks in advance for any help!