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#104791 - 11/15/03 03:24 AM Hazardous (Classified) Location - Rusty Threads and Corrosion!
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
This is a hazardous (classified) location.

Why?

What rules are required to be followed?

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Joe Tedesco, NEC Consultant

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#104792 - 11/15/03 08:10 PM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
crash Offline
Member

Registered: 10/21/03
Posts: 130
Loc: Calgary Canada
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.

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#104793 - 11/16/03 08:34 AM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
Joey D Offline
Member

Registered: 10/10/03
Posts: 263
Loc: Arlington MA U.S.
Whats the location ?

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#104794 - 11/16/03 09:29 AM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
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).]

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#104795 - 11/16/03 10:49 AM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
crash Offline
Member

Registered: 10/21/03
Posts: 130
Loc: Calgary Canada
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.

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#104796 - 11/16/03 11:00 AM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
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.
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Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#104797 - 11/16/03 02:22 PM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
wa2ise Offline
Member

Registered: 11/29/02
Posts: 771
Loc: Oradell NJ USA
All those wires dangling out of that box on the right looks like a bad idea here :-(

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#104798 - 11/16/03 02:29 PM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
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.

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#104799 - 11/16/03 02:40 PM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
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)
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Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#104800 - 11/16/03 06:08 PM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
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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