NEC 500

[alixenos]

Hi,

I have a fuel storage canopy that is hazardous location. its dimension is 40'by 50.

everything in the interior of this canopy, I rated it to be class I division I.

How much clearance is needed to deem the area surrounding the canopy to be safe?

where in the code ?

Thanks.

 

[augie47]

Likely Art 514..
What type fuel ?

 

[kwired]

Likely Art 514..
What type fuel ?

Possibly 515 as well.

Need details of what type of fuel as you mentioned and the actual use.

If nothing is transferred/dispensed within that area other than through closed piping and any tank vents are routed away from the area it could possibly be only division 2 areas or even unclassified areas. Though the canopy kind of suggests maybe vehicles do come in under the canopy and there is transferring/dispensing going on under at least a portion of this area.

With no side walls at all, I think it generally would be treated no different than if there were no roof over it when it comes to determining classified areas.

 

[don_resqcapt19]

Someone needs to provide you with the area classification drawings that are required by 500.4

 

[kwired]

Someone needs to provide you with the area classification drawings that are required by 500.4

NEC defines those areas if the application falls under art 511-516.

 

[don_resqcapt19]

NEC defines those areas if the application falls under art 511-516.

You still need the documentation that is required by 500.4 as the general rules in those articles do not cover every possible arrangement.

 

[kwired]

You still need the documentation that is required by 500.4 as the general rules in those articles do not cover every possible arrangement.

I can kind of see that. My experience has been my EI's will go by what is in 511-516. I never really been on a project with hazardous locations that had engineered drawings either. Most were rather small projects and mostly design build type things. Gas stations maybe had such drawings but never had anything that would have varied from 514 on them, Grain handling or similar Division 2 applications - often came down to combination of things between EI, fire marshal, maybe owners insurance on determining classifications. Usually pretty consistent enforcement between one place and the next until you run into some situation never encountered before or seldom encountered then those three parties are the ones that typically end up with the classifications somehow. At places where there is no inspection, good, bad, or ugly is totally up to me. This often common on farm places here.