Hi Christine:
One last point: If the board does not accept
the unit on the basis of the NRTL certification,
then you should ask the NRTL to intervene. (You
should probably do so right now, prior to taking
the matter up with the board!)
If the local jurisdiction does not accept the
NRTL certification, then this will mean a loss
of business in that jurisdiction for the NRTL.
Most NRTLs would work towards having all of
their certifications accepted by all local
jurisdictions.
Good luck,
Rich
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Christine
Rodham
Sent: Wednesday, May 13, 2009 7:38 AM
To: [email protected]
Subject: Re:NRTL Mark vs. NEC Inspector
List Members,
We have an interesting problem. We sold an OEM product ( very high end Home
Theater Movie Projector , better than a movie theater quality) which was
listed by a well known NRTL. ( We modify and enhance the SW for high end
performance)
The projector was installed in a public place and the installation was
evaluated by a NEC ( National Electrical Code ) inspector.
The projector has a metal ungrounded heat sink attached to the chassis that
was added for cooling but was evaluated and approved by the NRTL.
The NEC inspector will not sign off on the installation stating non-current
carrying exposed metal parts that may be accidentally energized must be
grounded to the chassis. Grounding the heat-sink to the chassis will be
difficult due to the design of this special aluminum heat-sink.
Here are my questions:
* What is the criteria to determine if a metal part can become accidentally
energized?
The only way it could happen in this case is if the power cord that is near
the heat-sink is
damaged and then touches the heat-sink. The power cord is UL approved and
properly
rated.
* How many fault conditions ( single vs multiple ) are considered to determine
if a metal part can become accidentally energized.
* What would be our best option in arguing this ruling. Should we request
another inspector or get the NRTL involved?
Note that this unit is ceiling mounted and only trained service people would
have access to it after the initial installation.
Thank you!
Christine Rodham
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-mail to
<[email protected]>
All emc-pstc postings are archived and searchable on the web at
http://www.ieeecommunities.org/emc-pstc
Graphics (in well-used formats), large files, etc. can be posted to that URL.
Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <[email protected]>
Mike Cantwell <[email protected]>
For policy questions, send mail to:
Jim Bacher <[email protected]>
David Heald <[email protected]>
