I believe that DT is the only carrier that uses -60Vdc CO's, but I think
that it is only present in their older CO's.
It's not that hard to meet the requirements though - just maintain 1mm
(40th) creepage clearance between TNV-2 and SELV, GND, etc (up to your
DC/DC's/opto-isolators/bridging caps) and make sure any bridging
capacitors are physically large enough to have 1mm between the pads (Y
rating is not required but anything smaller than a 1206 SMT cap is too
small to maintain spacings). Voltage rating on the caps is important
too, I guess - pick according to proper NEBS reliability derating.
-And you may have to ensure that your DC/DC's are rated properly.
Best Regards,
Dave Heald
- Original Message -
From: Joe Finlayson jfinlay...@telica.com
To: 'EMC PSTC' emc-p...@ieee.org; 'NEBS Newsgroup'
n...@world.std.com
Sent: Thursday, April 03, 2003 2:39 PM
Subject: C.O. Battery Voltages - EVERYWHERE
I'm interested in obtaining information on the percentage of C.O.'s
worldwide that are utilizing -60VDC as their battery voltage. It is my
understanding that a majority use -48VDC although some still use -60VDC.
Any and all information/references would be helpful. If there are
references that are country specific or carrier specific, that would be
valuable information as well. Any charts/spreadsheets out there similar
to the mains supply charts I've seen would be excellent.
Thx,
Joe
*
Joe Finlayson
Manager, Compliance Engineering
Telica, Inc.
734 Forest Street, Bldg. G, Suite 100
Marlboro, MA 01752
Tel: (508) 804-8212
Fax: (508) 480-0922
Email: jfinlay...@telica.com
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