ECN Forum Forums Photo Discussion Forums Violation Photo Forum Hazardous (Classified) Location - Rusty Threads and Corrosion!

This is a hazardous (classified) location.

Why?

What rules are required to be followed?

North of the border, this would be considered a "Category 2" location as it appears liquids and corrosion are present. Is the N.E.C. similar in defining this area.

Whats the location ?

Wow, that looks like an agonizing quandary, for likely corrosives and flammable vapors are anticipated. I’m not up on the latest in enclosure innovations from Appleton or Crouse-Hinds, but it looks like “combination” NEMA type 6 or 6P and 7 enclosures [99NEC Table 430-91] would be needed.

There is another wrench-in-the-gears here. In typical situations for this type of equipment, it would seem to be insanity not to use some sort of anti-seize compound on ALL threaded surfaces. Is there anything listed for such an application that will preserve explosion-proof integrity?




[This message has been edited by Bjarney (edited 11-16-2003).]

Other than the electrical equipment being explosion proof, is there something else in the picture that indicates flamable vapors? I don't have a very good monitor and some details are not clear.

I am not very good with hazardous location work but the fact it is a pit has some influence I believe.

Bjarney

But why? all that stuff will unthread easily.

All those wires dangling out of that box on the right looks like a bad idea here :-(

iwire — No personal offense intended, but I disagree with you on this. I'll bet rusted threads would make disassembly of pipe and cover threads very difficult.

I was only clowning around, I would think all those smallish cover screws would break before coming loose.

And the large diameter fine threaded J box covers would be just plain imposable to remove with out the "red" wrench. (heat)

Sorry iwire — I missed the smiley face in your post.

In some plants, anti-seize goo {like “Never-Seize” or “Fel-Pro C5A”} is a means of survival if anything threaded needs survive corrosion, but for explosion-proof fittings is not compatible with the ignition "venting process" as I understand it.