Never heard of it. The only place I've ever heard of actual "flame" sensing was some company providing such sensors for companies which handled, mfr'd, shipped combustibles. Mixing and loading dock areas.
Resulted not from any requirement either, although I've no experience in the combustibles area. Sort of interesting. One of the problems they had to solve involved burning alcohol. Alcohol burns nearly invisible. The other was differentiating between an actual flame and something like a mirror from a truck reflecting the sun on a clear day. Bad stuff at race tracks when there's an accident. Emergency crews can't see it and can run right into it. So they end up spraying the entire area where they think it's burning. Although, come to think of it ... You might cite the flame spread test in GR-63. Such a shut down would prevent the spread of "heat" as well as flame. Maybe a little bit of a stretch of the standard, but what the hey. The RBOCs are very sensitive to flame spread. And I'm sure they'd at least listen to any attempt to prevent spread. You'd have to define and defend what the temp of a direct flame situation (something in your product burning) or indirect flame (something next to your product burning) would be, I guess. At least that's what I'd try to do. And, like Eric said, there certainly are RBOCs out there with their own requirements above and beyond the wording of the standard. Keep in mind that the Bellcore specs are not like the public standards such as UL, FCC, ... which are ultimately enforced by law. The Bellcore standards are private standards which are not enforced by law but by customer contract. Customers can pick and choose or modify or delete parts of them as they see fit for their own situation. Regards, Doug McKean David Spencer wrote: > > Hi All, > I'm not sure where this question fits, so I'm sending it to all. Excuse the > redundancy, as I'm sure many of you receive mail from all of these lists. > > An interesting question came up today regarding a fantray design and using a > thermal shutdown to turn off power to the fans when it is presumed obvious > that there may be a fire. It sounds like a great idea to me. However, it > will be a lot easier to sell if there is a requirement somewhere to support > it. > > Question: Does anyone know of a specific requirement to control fans in the > event of a fire? This can from any source, i.e. ETSI, ANSI, or Telcordia, > etc.
