Pete: I don't think the riser requirements would apply to a passive optical hub, but only to a cable in a vertical run. The issue is wicking of a fire by vertical cable and spreading to other floors. Stare at NEC 770.154(B)(1) for a second! Also, the NEC handbook has a nice expansion on "riser raceway" at the end of Article 770.
Moreover, you might not have a need for NRTL listing if the optical hub uses no electricity. Best regards, Don Gies, N.C.E Senior Product Compliance Engineer Alcatel-Lucent Murray Hill, NJ 07974-0636 USA From: Peter Tarver [mailto:[email protected]] Sent: Friday, November 06, 2009 8:53 PM To: [email protected] Subject: Consider a passive, unpowered (no electrical utilization) 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]>
