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From: Rob Legg [SMTP:r...@potentia.ca]
Sent: Friday, May 18, 2001 8:49 AM
To: Richard Meyette; 'Tania Grant'; emc-p...@majordomo.ieee.org
Subject: RE: Disconnect Devices for Telecom Equipment
Group,
Continual reference to centralized DC
...@majordomo.ieee.org'
Subject: RE: Disconnect Devices for Telecom Equipment
Tania,
The -48V centralized DC power systems used in the central offices of
telecommunications companies are limited to 60 VDC or less under normal
operating conditions, including during charging of the batteries
...@majordomo.ieee.org'
Subject: RE: Disconnect Devices for Telecom Equipment
Tania,
The -48V centralized DC power systems used in the central offices of
telecommunications companies are limited to 60 VDC or less under normal
operating conditions, including during charging of the batteries, and are
therefore
[mailto:taniagr...@msn.com]
Sent: Wednesday, May 16, 2001 7:18 PM
To: Richard Meyette; 'emc-p...@majordomo.ieee.org'
Subject: Re: Disconnect Devices for Telecom Equipment
Rick,
A -48 volt source is considered a secondary circuit, but that does not
necessarily make it a SELV circuit. I also don't
; the content,
however, has not changed from UL 1950 that I have noticed.
Tania Grant
taniagr...@msn.com
- Original Message -
From: Richard Meyette
Sent: Wednesday, May 16, 2001 4:35 PM
To: 'emc-p...@majordomo.ieee.org'
Subject: Disconnect Devices for Telecom Equipment
Here's
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
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