Here's a question for you telecom experts: Paragraph 2.6.3 of UL 1950 (Third Edition) requires permanently connected equipment, that is not provided with a disconnect device, to include a statement in the installation instructions that an appropriate disconnect device shall be provided as part of the building installation.
Telecom equipment intended for connection to a -48V centralized DC power system located in a central office is considered to be permanently connected equipment. However, the centralized DC power source is considered to be a SELV secondary circuit. I don't think that this requirement would be applicable in this case, since section 2.6 deals with the requirements for primary power isolation. However, I am being told otherwise. It is no big deal to provide the statement. I would just like to get some clarification on how this requirement is applied to telecom equipment. Rick Meyette Terawave Communications
