we have a paint mixing room for owner RV body shop, it class 1-2 hazardous location. At has computer and scale in the room,how do I bring the data wiring through wall from the master computer,through a sealoff:blink:?
I remember running into this once before in an auto body shop paint room, so same thing. It goes beyond the seal-off. The link has to be intrinsically safe and I don't believe an ethernet CAT5e connection can meet that specification. A fiber optic cable would. At any rate I would contact the paint room scale and computer manufacturer for advise. I'm willing to bet there is an optical port on the back of it.
Edit to add: I assume that the paint room computer and scale are suitable for a Class 1, Div 2 location? I believe my experience was that the scale is in the room, computer outside but viewable through a window from the scale.
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.
Yup. Home Depot shop lights connected with extension cords, the paint agitator rack connected with SO cord to a regular wall recepticle somebody installed right next to the drums of thinner is pretty much the norm. And you want them to buy a C1D2 PC? :happysad:
Something like this depends on the manufacturer of the mixing equipment. The one I saw had a scale undoubtedly for a C1D2 environment with an intrinsically safe cable to connect with the outside world. The computer was a regular PC. All were supplied by the manufacturer. I agree with what you say but I suspect cost and ease of installation was a factor in the design. It's still cheaper to run one cable outside than to have everything inside.