Robert,
I don't have the answer, but if you review Article 500 of the National Electric
Code (NEC) and UL's website you may be enlightened.
http://www.ul.com/hazloc/
Best Regards,
Jody Leber
Laboratory Manager
jle...@ustech-lab.com
http://www.ustech-lab.com
U. S. Technologies
3505 Francis C
Hi Robert -
I would refer you to UL's HAZLOC web page to learn more about standards
requirements, and to NFPA No.: HLH-97, Electrical Installations in Hazardous
Locations, to learn more about how hazardous areas are classified.
>What is the difference between a product that is certified to Class
Div 1 = normally hazardous. Div 2 = only hazardous in the event of a failure
(e.g. ventilation breakdown, pipe/tank rupture). For that reason, Div 2
hardware need only pass in the normal operating state, no circuit faults are
considered. The logic being applied is that two unrelated faults a
Robert,
Check out the National Electric Code (NFPA 70) Article 500-7(a) and 500-7(b)
for your answer, but simply stated, In a Division 1 location, the hazardous
atmosphere is assumed to be present under normal conditions, and a Division
2 location, the hazardous atmosphere is present under abnorm
Robert:
To my best recollection, the essential difference is that Div. 2 is an
environment subject to occasional presence (leaks) of flammable/explosive
gases, while Div. 1 is where this stuff is always present or potentially
present. I suppose this is a simplification, but I think it expresses t
Hello Robert,
A visit to the Safety Link and an in-page search on
the term "hazloc" will deliver you to a spot within the Safety Link with
several very good tutorials and other resources on this topic.
Regards, Art Michael
Int'l Product Safety News
A.E. Michael, Editor
166 Congdon St. East
P.
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