Many Thanks, Where does one get these guides??
Jim James Wiese Regulatory Compliance Engineer ADTRAN, Inc. 205-963-8431 205-963-8250 FAX [email protected] >---------- >From: Randolph Ivans[SMTP:[email protected]] >Sent: Wednesday, January 28, 1998 2:28 PM >To: [email protected] >Cc: Thomas Lanzisero; Vincent Sylvester >Subject: RE: telco spacing,listings, etc. > >Jim, > >The category description is what tells the user/installer what factors were >considered as part of the Listing or need to be considered as part of the >product's use or installation. It would seem to me that this is important. >For example, the category "guide" information for NWGQ includes not only >that UL1950 is the standard that is used but also that the equipment is >intended for installation in accordance with the NEC. It also has info >regarding installation in "computer rooms", use and testing of equipment >that might be installed in environmental air space, etc. > >The category guide for primary protectors (i.e. carbon blocks, etc.) >includes information concerning codes that are used to identify the fusing >bridal wire that must be used at the installation to afford adequate >protection. The "custom-built" category guide includes codes and >information that can be used by installers or inspection authorities to >help make sure the equipment is compatible and installed correctly. The >"Communication Service Equipment" category guide includes a reference to >the NESC as well as the NEC, since this equipment might be used in areas >not covered by the NEC, such as up on shared facility utility poles, >pedestal sites, etc..It also talks about the minimum outdoor environmental >conditions that are considered (temperature range, rain, etc.), protection >issues (since some devices incorporate primary protection) and the like. > >CSA has a similar system in place that describes the certification category >as does UL's c-UL program for Canada. I'm not sure about the other labs. > >UL has a Canadian category for Communication Service Equipment (DUZO7). We >have a number of Listings in this category and I have not heard anything >about it not being accepted. (We have also issued (at the mfrs request) >some IEC950 CB reports on equipment that was covered under this category >and included the additional requirements we considered important as an >addendum to the basic report!) > >There is nothing unusual about another specification (such as a Bellcore >GR) referencing a standard rather than a category. In fact, this would be >the right way to do it. If the entire standard is referenced then by right >the equipment must meet the entire referenced specification to comply with >the clause in the basic spec. Sometimes, like for the AC Power Fault Tests >in GR-1089-CORE , 4.5.13 note 10, only a portion of the spec is relevant to >the AC power fault tests (the UL1459 overvoltage tests) and I would say >that this type of reference would not require or imply complete compliance >with everything else since the note is specific to this section. The GR is >only looking for the data and an indication of compliance with the >overvoltage test. (This is also a good example of what I talked about >earlier where a spec is referenced but modified....GR-1089 requires one of >the UL1459 tests to be modified up to 277 Volts.) > >R4-5 of 1089 states "shall be listed for the purpose". For most customer >premises equipment, WYQQ or NWGQ would be appropriate since the equipment >is on the protected side of the NI and the resulting "listing" would show >compliance with UL1459 or UL1950. However, an SIU that provides the network >interface, isolation and primary protection would be "listed for the >purpose" if it were covered under DUZO since this category covers the >relevant safety issues while a listing under WYQQ or NWGQ would probably >not be appropriate "for the purpose" of its actual usage. > > >Randy Ivans >Business Sector Coordinator >Telecommunications Industry >email: [email protected] > >
