Dear Gary, A terminal block ( I assume it is suitable for the number and size of wiring to be accepted in the field and that it is Recognized/Certified for field wiring) is an acceptable method for connection of telecom equipment to the dc supply in a RAL (Restricted Access Location). Since you are not providing a means to terminate a wiring system (ie, conduit, raceway, etc) and a wiring compartment in accordance to the US/Canadian Elecrical Code, instructions must be provided to route the wiring to prevent mechanical abuse.
Alternatively, an equipment such as yours, may be connected to the supply source by means of special Listed detachable Cord Set. This is not common for dc powered equipment but there is a Category for Listed Power Cable Assemblies, that covers specialized cable/connector assemblies for centralized dc applications. I do not have the UL1950 standard with me at this time, but based on your description, I strongly believe you can specify in your installations instructions the need for a disconnect device for each power supply as part of the building installation. I have personally been involved with many similar telecom product investigations where the disconect device was specified in the installation instructions. Regards, From: Gary McInturff <[email protected]> To: "'emc-pstc list server'" <[email protected]> Subject: help Mr. Wizards Date sent: Mon, 26 Oct 1998 17:26:21 -0800 Send reply to: Gary McInturff <[email protected]> > I am concerned with the requirement - or not - of having a disconnected > device other than wiring terminal block on equipment residing in telco > CO's. This would be for redundant -48 Vdc supplies. > I have been following the discussion lately and the intent seems to be > to provide that - possible through and IEC 309 (?) style connector. > However, the design engineer really doesn't want to put in anything > except terminal blocks. If I read all the references UL 1950 2.6, > 2.6.11, and 3.4 I'm not sure I can justify the requirement for a > disconnect closer than the breaker panel. > Am I just being a sore loser here? How have any of you resolved the > issue. > The product is a 300 pound stationary device, can be rackmounted, and it > has a redundant power supply which shares current until a failure of the > other supply and then takes over the entire load. > ??????? Snort ??????? > Thanks > Gary McInturff > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > PETER S. MERGUERIAN MANAGING DIRECTOR PRODUCT TESTING DIVISION I.T.L. (PRODUCT TESTING) LTD. HACHAROSHET 26, P.O.B. 211 OR YEHUDA 60251, ISRAEL TEL: 972-3-5339022 FAX: 972-3-5339019 E-MAIL: [email protected] Visit our Website: http://www.itl.co.il --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
