Hi Ron:
First, for assistance with an NEC issue, you SHOULD contact the
NEC authors, the NFPA. They have the following web site:
http://www.nfpa.org/
Click on:
Proposals /
Comments
Query &
Display
Then click on:
Staff Directory
Then click on:
Engineering Advisory Service
Pick an expert that seems to match your questions, or click on:
NFPA 70, National Electrical Code.
This will enable you to send a message directly to NFPA.
> 1. Does the term (telecommunications network) refer to public or private
> networks?
Since the NEC refers you to UL 1459, then I would use the definition
from UL 1459. UL 1950 SHOULD use the same definition; see Sub-clause
1.2.14.7. UL 1950 states:
"A telecommunication network maybe publicly or privately owned."
> 2. Does the term refer to networks where overvoltage conditions can be
> present?
> Maybe this can be assumed as UL1459 requires overvoltage compliance.
> However,
> UL1950 provides for classifications of TNV circuits (Annex V).
For the purposes of UL (and therefore the NEC), telecommunications
networks ARE subject to overvoltage (power cross) conditions. See
UL 1950, Sub-clause 6.6. I believe UL 1459 and UL 1950 are the
same in this respect.
> 3. Does the term refer to on-premise or off-premise?
UL 1950 does not contain any such distinction. However, it does
provide examples of both public switched network and private networks
with electrical interface to the public network. Since a public
network implies off-premises, I believe the term "network" includes
both on-premises and off-premises.
> 4. Will the 1999 NEC provide these definitions?
The NFPA web site includes all of the proposals for the next edition
of the NEC. Click on:
NEC
Proposals
and
Comments
Review
Then, click on the box:
Article 760 -
Article 830
(339k)
There are a number of proposals to change Article 800, including a
definition for "premises." You can easily download these from the NFPA
and check them out. These are PDF files.
> 5. Is there any way for these questions to get to the appropriate NEC
> committee
> for a response?
Yes. See the NFPA web site mentioned above. It does help if your
company is a member of the NFPA.
Best regards,
Rich
-------------------------------------------------------------
Richard Nute Product Safety Engineer
Hewlett-Packard Company Product Regulations Group
All-In-One Division Tel : +1 619 655 3329
16399 West Bernardo Drive FAX : +1 619 655 4979
San Diego, California 92127 e-mail: [email protected]
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