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dman023
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Join Date: May 2011
Posts: 2

Class II Hazardous Area Classification

05/17/2011 10:59 AM

Hi,

I have to do area classification for a industrial process plant. The chemical is sodium cyanide in solid form, it's not combustable nor flammable. My question is should the area be classified as Class II, Division II, Group G since the equipment need to be dust proof to prevent any unwanted insulation barrier between electrical contacts? Thanks.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Class II Hazardous Area Classification

05/17/2011 11:02 AM

As the material is not combustable, the only criterion needed to the electrical equipment is a satisfactory Ingress Protection rating. However, if the rating works out too severe, it might indicate that the facility has a materials containment problem opportunity to address, both on Health & Safety and economic grounds.

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KJK/USA
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Join Date: Apr 2010
Location: Mid Western USA - The Corn Belt
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#2

Re: Class II Hazardous Area Classification

05/17/2011 11:24 AM

dman,

If the "dust' is not combustible nor flammable why not go with a NEMA 4X classification rather than the expense of a CII, DII, Group G Area classification?

Go to this link for more info.

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