Std ATEX ExD IIG = NEMA 7 ?

[Saver2008]

Hi everybody!!!!

I have a question, if I want to use a NEMA 7 enclosure, you know that NEMA 7 are made of aluminum exent of copper and enclosures with standard ATEX Eexd IIG have enclosures explosion proof of aluminum exent of copper...can I use an enclosure of std atex AS A NEMA 7??? DOES STD ATEX EEXD IIG HAVE CLASIFICATION 1 DIV 2 GROUP ABC AND D???

Regards.

Roland

 

[ScottyUK]

If it doesn't say NEMA 7 then I seriously doubt it. Certainly NEMA 7 doesn't mean jack in the ATEX world.

That ATEX certification looks incomplete anyway, there should be a gas group and temperature class listed too. The information presented says it's a flameproof enclosure for surface (i.e. non-mining) duty with gaseous flammables but exactly which gases and which maximum surface temperature isn't stated.


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If we learn from our mistakes I'm getting a great education!

 

[eng1ne]

What's in the enclosure?

 

[rbalex]

Permit me to offer the corollary to ScottyUK's post: "EEx" doesn't mean jack in the NEC/US domestic world.

The certification also falls short in US marking requirements and pretty much for the same reasons (unspecified gas and temperature classifications) In addition, the NEC requires an "AEx" rather than "EEx" mark to indicate it was certified to a US "Zone" standard.

Oddly enough, with a proper temperature classification mark, it may still be fine in Class I, Division 2.

 

[ScottyUK]

First time I have heard of the 'AEx' marking - I will keep an eye open for it. Is that a relatively new requirement or have I just missed it in the past?


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If we learn from our mistakes I'm getting a great education!

 

[rbalex]

It has been part of the US National Electrical Code requirements since the 1999 Edition. [Section 505.10(b)(2)(c) in 1999, Section 505.9(C)(2)(3) in 2008] It's similar to CENELEC appending the leading "E" to IEC's basic "Ex."

 

[ScottyUK]

Thanks - something new I have learned today, and it's still only 0712 this morning!

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If we learn from our mistakes I'm getting a great education!