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Hazardous (Classified) Location - Rusty Threads and Corrosion! #104791 11/15/03 07:24 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline OP
Member
This is a hazardous (classified) location.

Why?

What rules are required to be followed?

[Linked Image]


Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104792 11/16/03 12:10 AM
Joined: Oct 2003
Posts: 147
C
crash Offline
Member
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.

Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104793 11/16/03 12:34 PM
Joined: Oct 2003
Posts: 259
J
Joey D Offline
Member
Whats the location ?

Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104794 11/16/03 01:29 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
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).]

Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104795 11/16/03 02:49 PM
Joined: Oct 2003
Posts: 147
C
crash Offline
Member
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.

Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104796 11/16/03 03:00 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
I am not very good with hazardous location work but the fact it is a pit has some influence I believe.

Bjarney
Quote
it would seem to be insanity not to use some sort of anti-seize compound on ALL threaded surfaces.

But why? all that stuff will unthread easily. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104797 11/16/03 06:22 PM
Joined: Nov 2002
Posts: 790
W
wa2ise Offline
Member
All those wires dangling out of that box on the right looks like a bad idea here :-(

Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104798 11/16/03 06:29 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
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.

Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104799 11/16/03 06:40 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
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) [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Hazardous (Classified) Location - Rusty Threads and Corrosion! #104800 11/16/03 10:08 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
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.

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