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 are not going
to happen at the same time. It's very easy for many types of product to pass
the Div. 2 requirements with little or no modification.
Div. 1 is another matter. The product has to be made to be effectively
"intrinsically safe". It cannot be capable of causing ignition via spark or
temperature with any two induced failures. You'll need to learn about diode
barriers, purged enclosures, and explosion proof technologies to decide whether
you want to proceed with this compliance.
If you're still interested, then I suggest that you got to the NFPA site and
purchase "Electrical Installations in Hazardous Locations" at:
http://www.nfpacatalog.org/cgi-bin/SoftCart.exe/STORE/PAGES/HLH-97.htm?L+nfpanonmembers+tbba4286
Best of luck,
Carl
From: "Loop, Robert" <[email protected]> on 03/15/2001 11:13 AM
Please respond to "Loop, Robert" <[email protected]>
To: [email protected]
cc: (bcc: Carl Newton/XYCOM)
Subject: Class I Division 1 versus Class I Division 2
Hello Group,
I need some education on Classified/Hazardous locations.
What is the difference between a product that is certified to Class I
Division 1 versus Class I Division 2?
If I had a product that was certified to Division 2, what would be needed to
make it pass Division 1 requirements?
I apologize for my ignorance, there are simply too many standards out there
and this is out of my league.
Sincerely,
Robert Loop
Engineering Supervisor
Wyle Laboratories
Product Safety
ph - (256) 837-4411 x313
fax- (256) 721-0144
e-mail: [email protected]
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