Hello Parviz: One way to verify that your supplier is in compliance to the Bellcore specifications is to ask for a Certificate of Conformance (C of C), stating compliance to these requirements. The more specific you are the better. As suppliers of magnetics to the telecommunications industry, many of our customers request this. We often need to supply them with the mass of flammable polymeric mass, and indicate all of the components (in our case tapes, plastics, etc.), quantities, and whether or not they are individually in compliance.
The Similarity between the Bellcore and UL requirements is that Bellcore relies in part on the UL ratings. For example, (clause 4.2.3 of GR-63-CORE), tapes must be UL 510 flame retardant, foamed polymers must be UL 94 HF1 or better, plastics must be UL 94V-1 or better, etc. They must also have an LOI (Oxygen Index) of 28% or greater as determined by ASTM D 2863-77. For information technology equipment, UL 1950 generally requires a UL 94V-2 rating (not as stringent as Bellcore). For cables and other things, other UL, IEEE, IEC, ANSI, CSA, etc. standards may be called out. For electronic components, rather than verifying the flame retardency of the materials, the component needle flame test may be performed. You will still need to verify that they are building the components with the same materials that you had it tested with. Hope this helps, Mel Pedersen Midcom, Inc. Homologations Engineer Phone: (605) 882-8535 mpeder...@midcom.anza.com Fax: (605) 886-6752 ---------- From: Parviz Boozarpour[SMTP:ee...@pacbell.net] Sent: Wednesday, February 25, 1998 12:48 PM To: emc-p...@ieee.org Subject: Bellcore Fire Resistance How do you verify that material, component, wiring, and cables used in component power supply meet Bellcore NEBS TR-NWT-000063 requirement for Fire Resistance in section 4.3.3. Is there any similarity between UL flammability and Bellcore fire resistance? Parviz Boozarpour, P. E. Electronic Engineering Services ee...@pacbell.net
