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RE: [EFM] Environmental classes


I guess these further classes would be within IEC 60721-3-4.

The present debate is about what to do about temperature.

Obviously, conditions vary.  For some equipment, it may be impractical or expensive to meet a global superset.

You mention humidity.  Like temperature, earthquake protection, weight, and many other product specifications, I hope EFM will have the good sense to stay with 802.3's traditional position of leaving the specification and measurement of such parameters to others.

Best regards,


> -----Original Message-----
> From: Roy Bynum [mailto:rabynum@xxxxxxxxxxxxxx]
> Sent: 08 January 2003 19:27
> To:;
> Subject: Re: [EFM] Environmental classes
> Piers,
> Are there classifications for "Hot Humid", "Extremely Hot", 
> and "Extremely 
> Humid"?  These conditions exist in parts of the Southern USA, 
> and almost 
> all tropical environments.  There are other "hazardous" 
> environments as 
> well that might need to be considered.
> Thank you,
> Roy Bynum
> At 04:11 PM 1/8/2003 +0100, piers_dawe@xxxxxxxxxxx wrote:
> >G.983.3 refers to ETS 300 019.  This is a very readable series of 
> >documents from the European Telecommunications Standards 
> Institute, giving 
> >a classification of environmental conditions, e.g. weatherprotected 
> >locations, non-weatherprotected, underground.  It uses four 
> classes of 
> >climatic conditions:
> >         "applies to most of Europe"
> >         extended
> >         extremely cold
> >         extremely warm dry
> >
> >And even better, up-to-date drafts are available on the web, e.g. at
> >
20101o.pdf .
>It is not the business of 802 to pick between these classes but we can 
>refer the readers of our standard to this information.
>ITU-T and ANSI T1 do not have similar documents.
>Both G.983.3 and refer to IEC 60721, classification of environmental 
>IEC 60721-3-4 - Ed. 2.0  Classification of environmental conditions - Part 
>3: Classification of groups of environmental parameters and their 
>severities - Section 4: Stationary use at non-weatherprotected 
>locations  1995-01 is available for CHF99 at 
> .