Hello, You wouldn't find the frame requirements in GR-1089. Those would be found in GR-63 and other GR's. It is also found in an ATIS standard about Universal frameworks that GR-63 is based on. The ATIS standard was written essentially by Larry Wong, formerly of AT&T and was their earthquake expert. It's concepts align very closely with GR-63 and ETSI.
There are basically 4 reasons metal frames are standard in the telecom industry and especially in the Telcordia world, and why plastic ones are not used: 1.) Grounding 2.) Resistance to fire - A non metal material that has flame retardants would be fairly brittle and per ATIS 00600307 and GR-63 would have to be UL 945V which would really make it brittle due to all the flame retardants and antioxidants needed for the flame test 3.) Robustness to earthquake and stripping out of screw holes. I seriously doubt a non-metal frame would survive the earthquake requirements in GR-63 and ATIS 0600329 4.) Plastics degrade over time as the anti-oxidants leave the material, and as such would not meet the life expectancies that service providers require. As C.O.'s get hotter, the rate of degradation of plastic frames increases. Jim Jim Wiese Senior Compliance Engineer ADTRAN, Inc. 901 Explorer Blvd. Huntsville, AL 35806 256-963-8431 256-714-5882 (cell) 256-963-6218 (fax) [email protected]<mailto:[email protected]> ________________________________ From: Neven Pischl [mailto:[email protected]] Sent: Tuesday, November 19, 2013 7:07 PM To: [email protected] Subject: [PSES] Equipment rack for GR1089 testing - does it have to be metal? Hello All, Is there a formal requirement, by either Telcordia/NEBS or by the major telecom carriers that the equipment rack (i.e. not the cable rack) be metal, when testing radiated immunity per the GR1089? I understand it is the usual practice - I have only seen such tests with a metal rack - but I am asking if there is such a requirement spelled out anywhere. I can't find it in GR1089. If any on this list knows of it, please can you forward the document, at least maybe a snapshot of the relevant paragraph along with the reference if the document can't be forwarded. Thank you, Neven - ---------------------------------------------------------------- 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]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
