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
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
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
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
Hello Robert,
A visit to the Safety Link www.safetylink.com 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
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