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#104791 - 11/15/03 07:24 AM Hazardous (Classified) Location - Rusty Threads and Corrosion!  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
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

#104792 - 11/16/03 12:10 AM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!  
crash  Offline
Member
Joined: Oct 2003
Posts: 147
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.


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


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


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


#104796 - 11/16/03 03:00 PM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#104797 - 11/16/03 06:22 PM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!  
wa2ise  Offline
Member
Joined: Nov 2002
Posts: 782
Oradell NJ USA
All those wires dangling out of that box on the right looks like a bad idea here :-(


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


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


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#104800 - 11/16/03 10:08 PM Re: Hazardous (Classified) Location - Rusty Threads and Corrosion!  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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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