Rich,
I believe that the reason CO's are exempted from many of the building
codes is the amount of work we put in to ensure that the products are safe
and reliable. The sprinkler exemption comes from the fire spread
requirement in GR-63. Basically, if the fire has been demonstrated to be
completely contained by the individual systems, there is no need for
building fire protection devices. The use of 48V systems has the benefit of
being SELV (in addition to the ability to have battery backups), so licensed
electricians are not required (or something to that extent). And so on and
so forth...
It basically all stems from the fact that the NEBS requirements greatly
exceed normal building and safety requirements - thus allowing the
exemptions from many building codes.
Regards,
Dave Heald
-Original Message-
From: richard.pa...@exgate.tek.com [mailto:richard.pa...@exgate.tek.com]
Sent: Monday, October 14, 2002 6:29 PM
To: emc-p...@ieee.org
Subject: NEBS questions
Hello Group:
I am glad to see the recent NEBS related discussions. I find them
interesting and relevant. So while I am thinking about NEBS, I thought I'd
ask a couple of questions.
I would like to understand more clearly the relationship between Central
Offices and local building codes.
I understand that the NEC basically exempts CO's. And that would mean that
any local AHJ adopting the NEC unchanged would have the same exemption.
But I am wondering how the CO's themselves view the local building codes.
Maybe they just ignore them, but perhaps they voluntarily try to meet them ?
Of course there's a lot of the actual requirements that are covered by the
NEBS requirements, but it would seem like some things (mains service
entrance ?) may not be covered.
Also, where exactly is the line that divides the exempt CO area from where
the local codes are applicable ?
As I think about it now, I don't recall the specific wording of the NEC's
exemption, but It would seem that it would include any requirement for using
Listed equipment or components. Although GR1089 does seem to require
Listing for AC mains connected equipment, do some companies require Listing
for equipment connected to the CO DC supply ?
The benefit of your experience and thoughtful comments will be appreciated.
Thanks
Richard Payne
Tektronix, Inc.
Product Safety Engineering
Tel: 503 627-1820
Fax: 503 627-3838
email: richard.pa...@tektronix.com
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