I've run into this issue several times in the oil and gas industry. You can break your cabels out and seal them, each pair needs to be broken out, packed and then sealed. Its a nightmare. The larger question is, is the computer intrinsically safe? I've installed several connection points OUTSIDE the classified area to allow for computer connection without taking the computer inside the classification. They probably make them with a huge pricetag, but I have never seen a compter that was listed for use in a hazardous location. As mentioned before, I have also not seen data connections forhazardous locations. The barrier is the easy part of this eqation, where it gets complicated is at the termination point.