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Old 31st May 2021, 9:26 pm   #14
pmmunro
Octode
 
Join Date: Jul 2004
Location: Dundee, UK.
Posts: 1,797
Default Re: Gents Flame Proof Clock

PJL,

Sorry to disagree.

Flameproof (Ex d) equipment will not allow flame or hot gas to pass from its interior to the potentially hazardous external atmosphere in which it is used. It is one of several techniques used to prevent igntion of hazardous atmospheres.

Intrinsic safety (Ex i) is a technique which depends on the equipment being designed and constructed to be incapable of supplying sufficient energy to cause a fire or explosion under the assessed conditions and in relation to the likely hazardous flammable material.

PMM
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