Corrected Subject line (cut and paste error) On 6 Nov 2009 at 17:52, Peter Tarver wrote:Priority: normal
> Cross-posted to the IEEE Electrical Safety Forum web > community. > > Consider a passive, unpowered (no electrical utilization) > fiber-optic distribution hub, stated by the manufacturer as > intended for installation in a riser (not a plenum, duct or > "other space for environmental air"). I've been told by an > NRTL, who was asked to evaluate the suitability for > installation in a riser, that this is prohibited, but the > arguments they use are related to environmental air spaces. > > In searching the NEC, not much is said about risers, except > for required cable flame ratings, and nothing that ties them > to environmental air spaces. I understood that risers could > not be used for environmental air spaces, based on the less > stringent requirements for flame spread and smoke developed > for riser cable, when compared to plenum cable. > > On the assumption that the riser is dimensionally large > enough to accommodate the hub (or anything else for that > matter) and the hub could meet the riser flame requirements, > is this a prohibited item in a riser? > > > Peter Tarver > > - > ------------------------------------------------------------ > ---- This message is from the IEEE Product Safety > Engineering Society emc-pstc discussion list. To post a > message to the list, send your e-mail to <[email protected]> > > All emc-pstc postings are archived and searchable on the web > at: http://www.ieeecommunities.org/emc-pstc Graphics (in > well-used formats), large files, etc. can be posted to that > URL. > > Website: http://www.ieee-pses.org/ > Instructions: > http://listserv.ieee.org/request/user-guide.html List rules: > http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
