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https://www.rstahl.com/fileadmin/Dateien/tgus/Documents/ExProtection_Global-America-Basics.pdf
Class I, Division 1 Risk Risk Division 1 Duration of time gas is present 1 Hour per Year 10 Hours per Year Zone 1 Zone 0 Zone 2 Division 2 Not Classified Not Classified Duration of time gas is present 1 Hour per Year 10 Hours per Year 1000 Hours per Year Frequency of Occurrence Division System Zone System Continuous Zone 0 Intermittent Periodically Zone 1
https://www.victorinsuranceus.com/Content/Industries/Builders_Risk/Documents/Protection_Class_Presentation.aspx
Sep 19, 2018 · Knowing the protection class How can I find out the protection class? 5 Protected •Protected 1 – One mile or less from fire department. •Protected 2 – More than one mile, but two miles or less from fire department. •Protected 3 – More than two miles, but three miles or less from fire department. •Protected 4 – More than
https://www.klsecurity.com/ul_ratings/1-hour-2-hr-3-hours.html
The most widely recognized industry standard for commercial quality fire safes is the UL Class 350 1-hour fire rating. This means that when the safe is exposed to external temperatures of over 1700° F, the internal temperature of the safe will not exceed 350° F for at least one hour.
https://www.gsacontainer.com/classes/classes.html
GSA Class 1: a GSA approved container meeting Federal Specification AA-F-357 (canceled) with entry protection consisting of 10 Man-Minutes forced entry, 30 Man-Minutes surreptitious entry and 1 hour fire rating. GSA Class 2: a GSA approved container meeting Federal Specification AA-F-357 (canceled) with entry protection consisting of 5 Man-Minutes forced entry, 20 Man-Minutes surreptitious entry and 1 hour …
http://firesafestore.com/fire-ratings
1 or 1/2 Hours UL rating - Class 125 or Class 150 Maintain an interior temperature less than 125F or 150F and an interior relative humidity less than 85% for class 150 or 80% for class 125, when exposed to fire as per the Standard Time Temperature Curve for hours to 1700F.
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